JP7381439B2 - work vehicle - Google Patents

Description

The present invention relates to a work vehicle equipped with crawler type left and right traveling devices.

A combine harvester, which is an example of a work vehicle equipped with a crawler-type traveling device, is disclosed in Patent Document 1.
In Patent Document 1, the traveling device includes a drive wheel, a tension wheel, a roller, a track frame that supports the roller, and a crawler belt. A left and right first link and a left and right second link are provided that are swingably supported on the aircraft body, the first link and the second link are connected to the track frame, and the first link and the second link are swingably supported. When the vehicle is operated, the aircraft body is raised or lowered relative to the traveling device.

JP2013-56626A

For work vehicles that travel over highly uneven work areas, there is a desire to increase the ground clearance of the machine.
SUMMARY OF THE INVENTION An object of the present invention is to provide a working vehicle equipped with crawler-type left and right traveling devices so that the ground clearance of the vehicle can be reasonably increased.

The work vehicle of the present invention has a drive wheel, a tension wheel, a roller, a track frame that supports the roller, and a crawler belt, and is equipped with left and right traveling devices that support the machine body, Left and right first support parts are provided on the frame and extend upward from the truck frame; a left and right second support part extending toward the left and right, a left and right first link supported by the body so as to be swingable about a first axis along the left and right direction, and a second right and left support part along the left and right direction; Left and right second links are provided that are swingable around an axis and are supported at a rear portion of the first link in the body, and the first link and the second link are swingably operated. The aircraft body is configured to be raised and lowered relative to the traveling device, the extending end of the right first link is swingably connected to the right first support portion, and the The extending end of the right second link is swingably connected to the right second support part, and the extending end of the left first link is swingably connected to the left first support part. connected, the extending end of the left second link is swingably connected to the left second support , the tension wheel is disposed at the front end of the traveling device, and the drive wheel is connected to the drive wheel. The tension wheel is disposed at the rear end of the traveling device, and the tension wheel is provided on the upper part of the first support part.

According to the present invention, the first support part and the second support part are provided extending upward from the truck frame, and the first link and the second link are connected to the first support part and the second support part. Therefore, the first link and the second link are arranged at a high position with respect to the truck frame.
By disposing the first link and the second link at a high position relative to the truck frame, the body is disposed at a high position relative to the truck frame, so that the ground clearance of the body can be reasonably increased.
According to the present invention, since the tension wheel is arranged at the front end of the traveling device and the drive wheel is arranged at the rear end of the traveling device, when the driving wheel is rotationally driven so that the work vehicle moves forward, the crawler In the belt, the ground-contacting portion of the crawler belt at the position of the roller near the drive wheel is pulled toward the drive wheel.
As a result, the drive wheel and the crawler's ground-contacting part are close together, and the ground-contacting part of the crawler belt does not buckle and bend when the crawler belt's ground-contacting part is pulled. is transmitted to the ground via the crawler belt without waste, which is advantageous in terms of improving the running performance of the work vehicle.
According to the present invention, since the tension wheel is disposed at a high position with respect to the truck frame, the difference in height between the tension wheel and the foremost wheel of the truck frame can be set to a large value.
This allows the vehicle to easily climb over large convexities on the work site, which is advantageous in terms of improving the running performance of the work vehicle.

In the present invention, it is preferable that a connection portion between the first link and the first support portion is located at a higher position than a connection portion between the second link and the second support portion.

For example, in a combine harvester, when a working device called a reaping section is installed at the front of the machine, the machine may tend to tilt forward.
According to the present invention, the connecting portion between the first link and the first support portion is arranged at a higher position than the connecting portion between the second link and the second supporting portion, so that the fuselage is set to tend to rise forward. becomes possible. This is advantageous in that, for example, in a work vehicle in which the working device is provided at the front of the machine body and the machine body tends to tend to tilt forward, the machine body can be maintained in a nearly horizontal state in the longitudinal direction.

In the present invention, left and right first arms extend upward from a portion of the first link that is supported by the body, and left and right first arms extend upward from a portion of the second link that is supported by the body. left and right second arms extended out, left and right linkage links connected across the first arm and the second arm, and left and right hydraulic cylinders that can be operated by pushing the first arm in the front-rear direction; When the hydraulic cylinder pushes the first arm, the first link is swung to the upright side, and the second link is moved through the linkage link and the second arm. It is preferable to perform a swinging operation to the standing side.

According to the present invention, when the hydraulic cylinder extends and pushes the first arm, the first link is swung to the upright side, and the operation of the first arm is transferred from the linkage link to the second arm. The signal is transmitted to the second link, and the second link is operated to swing toward the upright side, thereby causing the aircraft body to be operated to rise relative to the traveling device.
As a result, the extension operation of the hydraulic cylinder is transmitted to the truck frame without waste, and the lifting operation of the aircraft body can be performed.

In the present invention, left and right first body side support parts provided on the body and extending downward from the body, and a part of the body provided on the rear side of the first body side support parts. , left and right second body side support parts extending downward from the body, the right first link being swingably supported by the right first body side support part, and the right first link being swingably supported by the right first body side support part; The right second link is swingably supported by the right second body side support part, the left first link is swingably supported by the left first body side support part, and the left second link is swingably supported by the left first body side support part. It is preferable that the second link is swingably supported by the left second body support section.

According to the present invention, the left and right first body side support parts and the left and right second body side support parts are provided extending downward from the body, and the first link and the second link are provided as the first body side support parts. Since the fuselage is supported by the first link and the second fuselage side support part, the fuselage is disposed at a higher position than the first axis of the first link and the second axis of the second link.
By placing the aircraft at a higher position than the first axis of the first link and the second axis of the second link, the aircraft is placed at a higher position relative to the truck frame, which reduces the ground clearance of the aircraft. This is advantageous in terms of increasing the price.

In the present invention, a portion of the right first body side support portion that is adjacent to the support portion of the first link in the front and back direction, and a portion of the left first body side support portion that is adjacent to the support portion of the first link in the front and rear direction. a first horizontal frame constructed so as to span an adjacent portion of the frame; a portion of the right second body support portion that is adjacent to the support portion of the second link in the front-rear direction; and the left second body support portion; It is preferable that a second horizontal frame is provided so as to span the support portion of the second link in the side support portion and a portion adjacent in the front-rear direction.

When the first link and the second link are rocked and the aircraft is raised and lowered, a large load is applied from the first link and the second link to the first and second aircraft side support parts. There is.

According to the present invention, the first horizontal frame is installed across the left and right first body side support parts, and the second horizontal frame is installed across the left and right second body side support parts, so that it can withstand the above-mentioned load. As a result, the first body side support portion and the second body side support portion are reinforced.

According to the present invention, the first horizontal frame is attached to a portion of the first body side support portion that is adjacent to the support portion of the first link in the longitudinal direction, and the second horizontal frame is attached to the portion of the second body side support portion that is adjacent to the support portion of the first link. It is attached to a portion adjacent to the support portion in the front and back direction.
As the aircraft moves up and down, it is thought that a load will be applied to the first and second aircraft side supports from the first and second links in the longitudinal direction. The first horizontal frame and the second horizontal frame function effectively, which is advantageous in terms of reinforcing the first body side support part and the second body side support part.

It is a right view of a combine. It is a top view of a combine. It is a back view of a combine. FIG. 3 is a plan view of the vicinity of the aircraft body and the traveling device. FIG. 3 is a right side view of the fuselage and the vicinity of the traveling device. FIG. 3 is a right side view of the fuselage and the vicinity of the traveling device. FIG. 2 is an exploded perspective view of the fuselage and the vicinity of the truck frame. 6 is a cross-sectional view seen from the VIII-VIII direction in FIG. 5. FIG. 6 is a sectional view seen from the direction IX-IX in FIG. 5. FIG. It is a cross-sectional plan view of the vicinity of a threshing device, a grain tank, an engine, a transmission case, a transmission mechanism, and a reaping and threshing transmission mechanism. It is a vertical right side view of the threshing device, the engine, the transmission case, the transmission mechanism, and the vicinity of the reaping and threshing transmission mechanism. It is a vertical left side view of the vicinity of a grain tank, an engine, a transmission case, a transmission mechanism, and a reaping and threshing transmission mechanism. It is a vertical left side view of the vicinity of an engine, a transmission mechanism, and a reaping and threshing transmission mechanism. It is a longitudinal cross-sectional rear view of the threshing device, the grain tank, and the vicinity of the transmission mechanism. It is a vertical cross-sectional rear view of the vicinity of a mission case, a threshing device, and a grain tank. FIG. 3 is a vertical left side view of the vicinity of the mission case and the fuel tank. FIG. 3 is an exploded perspective view of the vicinity of the transmission case and the axle support portion. It is a schematic diagram showing the transmission structure from an engine to a threshing device and a reaping part. FIG. 3 is a longitudinal sectional front view of the vicinity of the front part of the threshing device. It is a left side view of the front part vicinity of a threshing device.

1 to 20 show an ordinary type combine harvester, which is an example of a work vehicle and an example of a harvester, where F indicates the front direction, B indicates the rear direction, U indicates the upward direction, and D indicates the downward direction, R indicates the right direction, and L indicates the left direction.

(Overall configuration of combine harvester)
As shown in FIGS. 1, 2, and 3, a machine body 1 is supported by a crawler-type traveling device 2, and a reaping section 3 and a driving section 4 are provided at the front of the machine body. A threshing device 5 is provided on the left side of the machine body 1, a grain tank 6 is provided on the right side of the machine body 1, and a crop discharge device 24 is connected to the rear lower part of the grain tank 6.

As the machine body 1 moves forward, crops in the field are harvested by the reaping unit 3, the harvested crops are supplied to the threshing device 5 for threshing processing, and the threshed crops are supplied to the grain tank 6 by the threshing device 5. and stored. When the grain tank 6 is full, the crops in the grain tank 6 are discharged by the discharge device 24.

(Aircraft configuration)
As shown in FIGS. 4, 5, and 6, the fuselage 1 has a plurality of frames 7, 12 facing forward and backward, and frames 8, 9, 10, 11 facing left and right, and is configured in a frame shape.

The left and right front-rear frames 7 are constructed by connecting a plurality of square pipes one above the other, and are arranged along the front-rear direction. A plurality of left-right frames 8, 9, 10, and 11 are arranged along the left-right direction and connected to the left and right front-rear frames 7. The left and right front-rear frames 12 are arranged along the front-rear direction, and the right and left ends of the left-right frames 8, 10, and 11 are connected to each other.

(Configuration of traveling device)
As shown in FIGS. 4, 5, and 6, the left and right traveling devices 2 include a drive wheel 13, a tension wheel 14, a plurality of wheels 15, a guide member 16, a track frame 17, a crawler belt 18, and an upper wheel 19. are doing.

The left and right first support portions 17a are provided on the upper surface of the front portion of the truck frame 17 and extend upward from the truck frame 17. The left and right second support parts 17b are provided on the upper surface of the rear side of the first support part 17a in the track frame 17, and extend upward from the track frame 17.

The tension wheel 14 is provided on the upper part of the first support part 17a of the track frame 17 via the left and right adjustment mechanisms 20, and is disposed at the front end of the traveling device 2. The adjustment mechanism 20 extends forward from the first support portion 17a of the track frame 17, and can change the position of the tension wheel 14 in the front-rear direction. Rolling wheels 15 and guide members 16 are supported by a track frame 17.

The left and right first body side support parts 7a are provided on the lower surface of the front part of the longitudinal frame 7 (body 1) and extend downward from the longitudinal frame 7 (body 1). The left and right second body side support portions 7b are provided on the lower surface of the rear side of the first body side support portion 7a of the longitudinal frame 7 (body 1), and extend downward from the longitudinal frame 7 (body 1). It is being extended towards.

As described in (Structure of supporting the transmission case) below, the left and right axle supports 23 are connected to the rear ends of the front-rear frame 7, and the drive wheel 13 is located at the position of the axle support 23. and is located at the rear end of the traveling device 2. The upper roller 19 is supported by the first body-side support portion 7a of the longitudinal frame 7.

A crawler belt 18 is attached over the drive wheel 13 , tension wheel 14 , wheel 15 , guide member 16 , and upper wheel 19 . The adjustment mechanism 20 allows the tension of the crawler belt 18 to be adjusted by changing the position of the tension wheel 14 in the front-rear direction. The guide member 16 prevents the crawler belt 18 from coming off the wheel 15.

By arranging the tension wheel 14 at a higher position than the front wheel 15, the front part of the crawler belt 18 is directed toward the tension wheel 14 diagonally forward and upward from the front wheel 15 in side view. It is in an extended state.

By arranging the drive wheel 13 at a position higher and rearward than the last roller 15, the rear part of the crawler belt 18 is directed toward the drive wheel 13 diagonally rearward and upward from the last roller 15 in side view. It is in an extended state.

(Configuration of lifting and lowering operations of the aircraft relative to the traveling device)
As shown in FIGS. 7 and 8, left and right first links 21 are provided, and the first link 21 has a fulcrum shaft 21b connected to the base of the first link 21 and an end of the fulcrum shaft 21b. It has a connected first arm 21a and a fulcrum shaft 21c connected to the extending end of the first link 21.

As shown in FIGS. 7 and 9, left and right second links 22 are provided, and the second links 22 include a fulcrum shaft 22b connected to the base of the second link 22 and an end of the fulcrum shaft 22b. It has a connected second arm 22a and a swing link 22c supported by the end of the second link 22 so as to be swingable back and forth.

As shown in FIGS. 4, 5, 7, and 8, the fulcrum shafts 21b of the left and right first links 21 are rotatable around the axis P1, which is the first axis along the left-right direction. It is supported by the first body side support part 7a of the body 1).

As a result, the first link 21 extends diagonally forward and downward from the axis P1, and is able to swing around the axis P1 to the upright side and the downside side. It is supported by the first body side support part 7a. A first arm 21a of the first link 21 extends upward from a fulcrum shaft 21b, which is a portion of the first link 21 that is supported by the longitudinal frame 7 (body 1).

As shown in FIGS. 4, 5, 7, and 9, the fulcrum shafts 22b of the left and right second links 22 are rotatable about the axis P2, which is the second axis along the left-right direction, from the first link 21. It is also supported by a second body-side support portion 7b of the longitudinal frame 7 (body 1), which is the rear portion.

As a result, the second link 22 extends diagonally forward and downward from the axis P2, and is able to swing around the axis P2 to the upright side and the downside side. It is supported by the second body side support part 7b. A second arm 22a of the second link 22 extends upward from a fulcrum shaft 22b, which is a portion of the second link 22 that is supported by the longitudinal frame 7 (body).

As shown in FIGS. 4, 5, 7, 8, and 9, the fulcrum shaft 21c of the first link 21 is swingably connected to the first support portion 17a of the truck frame 17. As shown in FIGS. In the first support portion 17a of the track frame 17, the adjustment mechanism 20 is arranged at a higher position than the fulcrum shaft 21c of the first link 21. A swing link 22c, which is an extending end of the second link 22, is swingably connected to the second support portion 17b of the track frame 17 via a fulcrum shaft 25.

As shown in FIGS. 5, 6, and 7, the fulcrum shaft 21c, which is the connecting portion between the first link 21 and the first support portion 17a of the truck frame 17, is connected to the second link 22 (swinging link 22c) and the truck frame 17. It is arranged at a higher position than the fulcrum shaft 25 which is the connection part with the second support part 17b.

As shown in FIGS. 4, 5, 6, 8, and 9, left and right link links 26 are provided, and the link link 26 is connected to the first arm 21a of the first link 21 and the second arm 22a of the second link 22. are connected across.

Left and right single-acting hydraulic cylinders 27 are provided, and the hydraulic cylinders 27 are arranged on the rear side with respect to the first arm 21a of the first link 21. A support bracket 28 is connected to a connecting portion between the front-rear frame 7 and the left-right frame 9, and a hydraulic cylinder 27 is connected across the first arm 21a of the first link 21 and the support bracket 28.

As shown in FIGS. 4 to 7, the horizontal frame 31, which is the first horizontal frame, is attached to the support portion (fulcrum shaft 21b) of the first link 21 in the first body side support portion 7a of the right longitudinal frame 7. The part adjacent in the front-rear direction (the part on the front side with respect to the fulcrum shaft 21b) and the part adjacent to the support part of the first link 21 (the fulcrum shaft 21b) in the first body-side support part 7a of the left front-rear frame 7 (the fulcrum shaft 21b) in the front-rear direction (the part on the front side with respect to the fulcrum shaft 21b) is connected and constructed.

The horizontal frame 32, which is the second horizontal frame, is located at a portion (the fulcrum shaft 22b) adjacent to the supporting portion (the fulcrum shaft 22b) of the second link 22 in the second body side support portion 7b of the right longitudinal frame 7 in the longitudinal direction. the front part), and the part adjacent in the front-rear direction to the support part (fulcrum shaft 22b) of the second link 22 in the second body-side support part 7b of the left longitudinal frame 7 (the part on the front side with respect to the fulcrum shaft 22b). ) and is connected and constructed.

(Status of lifting/lowering operation of the aircraft relative to the traveling device)
As shown in FIGS. 5 and 6, the hydraulic cylinder 27 extends and pushes the first arm 21a of the first link 21 forward (swinging operation), so that the first link 21 swings toward the upright side. be operated dynamically. Along with this, the second arm 22a of the second link 22 is swung forward via the link 26, and the second link 22 is swung toward the upright side via the second arm 22a of the second link 22. The vehicle body 1 is operated to move upward relative to the traveling device 2 (track frame 17).

As shown in FIGS. 6 to 5, when the hydraulic cylinder 27 is contracted, the first arm 21a of the first link 21 is operated backward (swinging operation) due to the weight of the aircraft 1, and the first link 21 is collapsed. It is operated by swinging to the side. Along with this, the second arm 22a of the second link 22 is swung rearward via the link 26, and the second link 22 is swung toward the collapse side via the second arm 22a of the second link 22. The vehicle body 1 is operated to lower with respect to the traveling device 2 (track frame 17).

As shown in FIGS. 4, 5, and 6, left and right height sensors 29 of the potentiometer type are supported at the rear of the front-rear frame 7, and are connected to the second arm 22a of the second link 22 and the height sensor 29. A linking member 30 is connected across. When the aircraft body 1 is lifted or lowered relative to the traveling device 2 as described above, the height of the aircraft body 1 relative to the traveling device 2 is determined by the height sensor via the second arm 22a of the second link 22 and the linking member 30. Detected by 29.

A tilt sensor (not shown) is provided to detect the tilt angle of the body 1 in the left-right direction with respect to a horizontal plane. The aircraft body 1 can be maintained horizontally by independently raising and lowering the left and right traveling devices 2 (track frames 17) relative to the aircraft body 1 based on the detected values of the inclination sensor and height sensor 29. The body 1 can be raised or lowered relative to the traveling device 2 (track frame 17) while the body 1 is maintained horizontally.

(Configuration regarding threshing device and grain tank)
As shown in FIGS. 1, 2, and 3, a threshing device 5 is provided on the left side of the machine body 1, a grain tank 6 is provided on the right side of the machine body 1, and the threshing device 5 and the grain tank 6 are connected in the left-right direction. They are provided on the fuselage 1 in a side-by-side manner along the lines.

As shown in FIGS. 10, 11, 12, and 14, the crops (first crop) that have been threshed and sorted in the threshing device 5 are collected in the first crop collection section 34 provided at the lower front part of the threshing device 5. will be collected. A screw-type conveying device 35 is connected across the first item collection section 34 and the upper front part of the grain tank 6 in the space between the threshing device 5 and the grain tank 6. The crops collected in the first crop collection unit 34 are transported upward by a transport device 35, supplied from the upper end of the transport device 35 into the grain tank 6, and stored in the grain tank 6.

In the threshing device 5, the insufficiently threshed crops (second crop) are collected by the second crop collecting section 36, and the second crop collecting section 36 collects the first crop at the lower part of the threshing device 5. It is provided in a portion on the rear side of the portion 34.

A screw-type reducing device 37 is installed in the space between the threshing device 5 and the grain tank 6, in the space between the threshing device 5 and the conveying device 35, and in the space between the second material collecting section 36 and the front part of the threshing device 5. It is connected across the upper and lower intermediate parts. The crops (second crops) collected in the second crop collection section 36 are returned to the threshing device 5 by the reducing device 37 and are reprocessed.

As shown in FIGS. 10, 12, and 14, in the grain tank 6, the lower part 6a of the grain tank 6 is formed in a downward concave shape with the left and right width becoming narrower as seen from the rear. A bottom screw 38 for conveying the crops toward the discharge device 24 is provided along the front-rear direction at the bottom of the lower portion 6a of the grain tank 6.

In the lower part 6a of the grain tank 6, an inlet part 6b that enters toward the left and right center of the grain tank 6 is provided at the rear of the part on the side of the threshing device 5.
A projecting portion 6c projecting toward the threshing device 5 is provided at the rear of the grain tank 6 and above the inlet portion 6b.

(Configuration related to engine)
As shown in FIGS. 10, 12, and 13, an engine 33 is provided along the left-right direction on the right side of the left-right frame 8 (see FIG. 4), and is located below the driver's seat 39 provided in the driver section 4. It is located in The engine 33 is arranged to be shifted to the right side, which is the side of the grain tank 6, with respect to the left-right center CL1 of the aircraft body 1 and the left-right center CL2 of the left and right traveling devices 2 (see FIG. 3), and is located in front of the grain tank 6. It is located at the front of the aircraft body 1.

As shown in FIGS. 1, 2, 10, and 12, a radiator 109 and an intercooler (not shown) are arranged on the right side of the engine 33, and a precleaner 40 and an air cleaner 41 are arranged above the engine 33. There is. A turbocharger 42 is provided at the front of the engine 33, and a fuel injection device 43 is provided at the rear of the engine 33.

Air is drawn from the precleaner 40 and supplied to the air cleaner 41 through a pipe 44. Air from the air cleaner 41 is supplied to the turbocharger 42 through a pipe (not shown), to the intercooler through the pipe (not shown), and to the engine 33 through the pipe (not shown). be done.

As shown in FIGS. 1, 3, 12, and 13, a muffler 48 is disposed on the left side of the engine 33, and an exhaust pipe (not shown) from the engine 33 and turbocharger 42 is connected to the muffler 48. There is.

An exhaust pipe 50 from the muffler 48 (engine 33) extends upward from the rear of the muffler 48, and is turned backward above the upper end of the reducing device 37, and is connected to the threshing device 5 and conveyed therein. While passing through the space between the threshing device 5 and the grain tank 6, it is disposed above the overhanging portion 6c of the grain tank 6 and extends rearward. .

(Configuration regarding the arrangement of the mission case and fuel tank)
As shown in FIGS. 1 to 4 and FIGS. 10, 11, and 12, the mission case 51 is provided in a portion of the fuselage 1 on the rear side of the reduction device 37, and is provided at the rear of the fuselage 1. With respect to the left and right center CL1 of the left and right traveling devices 1 and the left and right center CL2 of the left and right traveling devices 2, the travel device 2 is arranged to be shifted to the right side, which is the side of the grain tank 6.

The fuel tank 52 is provided in a portion of the fuselage 1 on the rear side of the mission case 51, and is provided at the rear of the fuselage 1, with respect to the left-right center CL1 of the fuselage 1 and the left-right center CL2 of the left and right traveling devices 2. It is arranged to be shifted to the right side, which is the side of the grain tank 6.

As shown in FIGS. 10, 11, 12, 15, and 16, a mission case 51 and a fuel tank 52 are arranged in the space between the threshing device 5 and the grain tank 6, and are provided at the rear of the fuselage 1. . The mission case 51 and the fuel tank 52, the rear part of the grain tank 6, and the rear part of the threshing device 5 overlap in the front-rear direction.

The mission case 51 and the fuel tank 52 enter into an area below the lower part 6a of the grain tank 6. An entry portion 6b of the grain tank 6 is provided at a portion of the lower portion 6a of the grain tank 6 that faces the mission case 51 and the fuel tank 52.
A projecting portion 6c of the grain tank 6 is provided in a portion of the grain tank 6 above the mission case 51 and the fuel tank 52.

(Configuration of the transmission mechanism that transmits engine power to the transmission case)
As shown in FIGS. 10, 11, and 12, a transmission mechanism 53 that transmits the power of the engine 33 to the mission case 51 is installed in the space between the lower part of the thresher 5 and the lower part 6a of the grain tank 6 along the front-rear direction. It is arranged as follows.

As described below, the transmission mechanism 53 includes an output pulley 54 as an output rotating body, an input pulley 55 as an input rotating body, a support case 56, a counter shaft 57, and a first relay pulley 61 as a first relay rotating body. , a second relay pulley 62 that is a second relay rotating body, a first transmission belt 63 that is a first endless rotating body, a second transmission belt 64 that is a second endless rotating body, a first tension wheel 65, and a second tension wheel. It has 66.

As shown in FIGS. 10 to 14, the output shaft 33a of the engine 33 comes out from the engine 33 toward the left side, which is the side of the thresher 5, and the output pulley 54 is connected to the output shaft 33a of the engine 33. It is provided. An input pulley 55 is provided connected to an input shaft 51a of the mission case 51 (see (configuration related to the mission case) described later).

A support bracket 9a (see FIG. 4) is provided on the left-right frame 9. The support case 56 is connected to the support bracket 9a of the left-right frame 9 along the left-right direction, and is disposed in the space between the engine 33 and the transmission case 51. placed in space.

A counter shaft 57 is rotatably supported by the support case 56 along the left-right direction. The first relay pulley 61 is connected to the left end of the counter shaft 57, which is one of the left and right ends. A second relay pulley 62 is provided connected to the right end, which is the other left and right end of the counter shaft 57 .

A first transmission belt 63 is attached across the output pulley 54 and the first relay pulley 61. A second transmission belt 64 is attached across the second relay pulley 62 and the input pulley 55. The second transmission belt 64 is disposed in a space between the grain tank 6, the conveying device 35, and the reducing device 37, and extends into a region below the lower portion 6a of the grain tank 6.

A boss portion 58 is rotatably supported in a portion of the counter shaft 57 between the first relay pulley 61 and the support case 56, and an arm 59 is connected to the boss portion 58 and extends diagonally forward and downward. There is.

A first tension ring 65 is rotatably supported at the end of the arm 59, and a spring 60 is connected between the bracket 56a provided at the upper part of the support case 56 and the arm 59 to bias the arm 59 upward. has been done. A first tension wheel 65 is supported by a support case 56 via a boss portion 58, an arm 59, and a counter shaft 57.

A boss portion 67 is rotatably supported in a portion of the counter shaft 57 between the second relay pulley 62 and the support case 56, and an arm 68 is connected to the boss portion 67 and extends diagonally rearward and downward. There is.

A second tension ring 66 is rotatably supported at the end of the arm 68, and a spring 69 is connected between the bracket 56b provided at the upper part of the support case 56 and the arm 68 to bias the arm 68 upward. has been done. A second tension wheel 66 is supported by the support case 56 via a boss portion 67, an arm 68, and a counter shaft 57.

A first tension wheel 65 and a second tension wheel 66 are pressed upward against the lower part of the first transmission belt 63 and the lower part of the second transmission belt 64. The tension state of the first transmission belt 63 and the tension state of the second transmission belt 64 are maintained.

With the above configuration, the power of the output shaft 33a of the engine 33 is transmitted to the output pulley 54, the first transmission belt 63, the first relay pulley 61, the counter shaft 57, the second relay pulley 62, the second transmission belt 64, and the input pulley 55. The signal is transmitted to the input shaft 51a of the mission case 51 via.

(Composition regarding mission case)
As shown in FIGS. 10, 11, and 12, the input shaft 51a of the mission case 51 comes out from the top of the mission case 51 toward the right side, which is the side of the grain tank 6, and the input pulley 55 is connected to the input shaft 51a of the mission case 51. It is provided connected to the shaft 51a.

As shown in FIGS. 11, 12, 15, 16, and 17, left and right hydrostatic continuously variable transmissions 70, which are transmissions for traveling, are provided on the right and left parts of the upper part of the mission case 51. .
The hydrostatic continuously variable transmission 70 is capable of steplessly shifting between a neutral position, a forward high speed side, and a reverse high speed side.

A cylindrical right axle case 102 is connected to the lower right portion of the transmission case 51 and extends laterally outward from the transmission case 51. A cylindrical left axle case 102 is connected to the lower left portion of the mission case 51 and extends laterally outward from the mission case 51.

A right axle 103 is housed in a right axle case 102 and extends toward the right outside of the body 1, and a right drive wheel 13 is supported at the end of the right axle 103. A left axle 103 is housed inside a left axle case 102 and extends toward the left outside of the body 1, and a left drive wheel 13 is supported at the end of the left axle 103.

In this case, as described in the above (Configuration regarding arrangement of mission case and fuel tank), the mission case 51 is located at the center of the grain tank 6 with respect to the left and right center CL1 of the aircraft body 1 and the left and right center CL2 of the left and right traveling devices 2. The left axle case 102 and the axle 103 are configured to be longer than the right axle case 102 and the axle 103 so that the axle case 102 and the axle 103 are arranged offset to the right side.

As shown in FIGS. 15 and 16, left and right axle gears 105 are connected to the ends of left and right axles 103 inside the mission case 51. As shown in FIGS. The left and right transmission gears 104 are arranged above the axle gear 105 and mesh with the axle gear 105.

As described in the above (Configuration of the transmission mechanism that transmits engine power to the transmission case), the power transmitted to the input shaft 51a of the mission case 51 is branched to the left and right by the transmission system inside the mission case 51. The signal is then transmitted to the left and right hydrostatic continuously variable transmissions 70 in parallel.

The power changed by the right hydrostatic continuously variable transmission 70 is transmitted to the right transmission gear 104 via the right transmission system inside the mission case 51, and from the right transmission gear 104 to the right axle gear 105. The power is transmitted to the right drive wheel 13 via the right axle 103, and the right drive wheel 13 and the right crawler belt 18 are rotationally driven.

The power changed by the left hydrostatic continuously variable transmission 70 is transmitted to the left transmission gear 104 via the left transmission system inside the mission case 51, and from the left transmission gear 104 to the left axle gear 105. It is transmitted to the left drive wheel 13 via the left axle 103, and the left drive wheel 13 and the left crawler belt 18 are rotationally driven.

By independently operating the left and right hydrostatic continuously variable transmissions 70, it is possible to move forward and backward, make a gentle turn to the right (left) by giving a speed difference to the left and right traveling devices 2, and perform right or left traveling devices 2. A pivot turn to the right (left) can be performed by stopping the vehicle, and a super pivot turn to the right (left) can be performed by reversing the left and right traveling devices 2 with respect to each other.

(Mission case support configuration)
As shown in FIGS. 4, 5, 6, and 7, the right axle support part 23 is attached to one side of the right longitudinal frame 7 (body 1) in the longitudinal direction so that it is aligned with the right longitudinal frame 7. It is connected to the rear end, which is the end. The left axle support portion 23 is connected to the rear end portion of the left longitudinal frame 7 (body 1) on one side in the longitudinal direction so as to be along the left longitudinal frame 7.

As shown in FIGS. 7, 11, 12, 15, and 17, a recess 23a having a semicircular cross section and facing rearward is provided at the rear end portion of the left and right axle support portions 23. Left and right fixing parts 108 each having a semicircular cross section are provided, and the fixing parts 108 are removable from the axle support part 23 . Since the axle support part 23 is a separate member from the front-rear frame 7, it is easy to configure the axle support part 23 into a structure suitable for supporting the axle case 102 without being influenced by the front-rear frame 7. .

A horizontal frame 106 facing left and right is connected across the right axle support part 23 and the left axle support part 23, and is connected across the right front-rear frame 7 and the left front-rear frame 7. There is.

As shown in FIGS. 4, 5, and 6, the horizontal frame 106 is disposed on the rear side, which is one side in the longitudinal direction with respect to the first link 21 and the second link 22, in side view, and is attached to the axle case 102. It is placed on the front side.

As shown in FIGS. 15 and 16, in side view, the horizontal frame 106 has the rotation axis of the transmission gear 104 (see imaginary line L3) and the rotation axis of the axle gear 105 (axle 103) (see imaginary line L4). ) is located at a height between

As shown in FIG. 5, the upper connection portion A1 between the second link 22 and the linkage link 26, which is one side of the first link 21 and the second link 22 in the front and back direction, and the front and rear of the first link 21 and the second link 22, At the fulcrum shaft 25 which is the lower connecting portion between the second link 22 on one side in the direction and the track frame 17 (second support portion 17b), the horizontal frame 106 is connected to the upper connecting portion A1 (imaginary line) in side view. (see virtual line L1) and the fulcrum shaft 25 (see virtual line L2).

As shown in FIGS. 11, 12, 15, 16, and 17, a support member 107 having a triangular shape in side view is provided. ), and a portion between the left and right front-to-back frames 7 in the horizontal frame 106 .

With the above configuration, the axle case 102 is inserted into the recess 23a of the axle support 23 from the rear side with respect to the recess 23a of the axle support 23. The fixed part 108 is connected to the axle support part 23, and the axle case 102, which has entered the recess 23a of the axle support part 23, is sandwiched between the axle support part 23 and the fixed part 108 in the front-rear direction. As a result, the right axle case 102 is fixed to and supported by the right axle support part 23, and the left axle case 102 is fixed to and supported by the left axle support part 23.
In addition to the axle case 102 being fixed to the axle support part 23, the front part of the transmission case 51 is connected to a support member 107.

The mission case 51 is connected to and supported by the fuselage 1 at three locations: the right axle support portion 23 (right axle case 102), the left axle support portion 23 (left axle case 102), and the support member 107. There is. The transmission case 51 is connected to and supported by the left-right frame 11 via a support member 107, and is connected to and supported by the horizontal frame 106 via the support member 107.
The mission case 51 is disposed above and below the front-rear frame 7 and the left-right frame 11, which are the frames of the aircraft body 1, as viewed from the side.

By removing the fuel tank 52, releasing the connection between the transmission case 51 and the support member 107, and removing the fixed part 108 from the axle support part 23, the axle case 102 can be moved rearward from the recess 23a of the axle support part 23. The transmission case can be removed facing backwards.

(Configuration of power transmission to threshing device, reaping unit, and grain tank)
As shown in FIGS. 10 to 13 and 18, a relay shaft 71 is supported in the front part of the threshing device 5 in the machine body 1 along the left-right direction, and the relay shaft 71 is connected to the output shaft 33a of the engine 33. It is located on the front side.

As shown in FIGS. 18, 19, and 20, the input pulley 72 is connected to the right end of the relay shaft 71, which is the end on the engine 33 side. A belt 73 is attached. A relay pulley 45 is connected to the left end of the relay shaft 71.

A handling cylinder 46 for threshing crops is arranged along the front-rear direction at the top inside the threshing device 5, and a drive case 47 is provided at the top of the front part of the threshing device 5. A transmission shaft 49 extends leftward from the drive case 47, and a transmission belt 76 is attached to the transmission pulley 49a connected to the left end of the transmission shaft 49 and the relay pulley 45. .
Inside the drive case 47, a bevel gear 46b connected to the drive shaft 46a of the handling cylinder 46 and a bevel gear 49b connected to the right end of the transmission shaft 49 are engaged.

As shown in FIGS. 10, 18, and 20, a winnowing machine 77 that generates sorting air is provided at the lower part of the front part of the threshing device 5, and an input pulley 77a connected to the left end of the winnowing machine 77 and a relay pulley 45, a transmission belt 78 is attached.

An input pulley 34a is connected to the left end of the first object collecting section 34, and an input pulley 36a is connected to the left end of the second object collecting section 36. A sorting shaft 79 that drives a sorting section (not shown) provided in the threshing device 5 is arranged along the left-right direction at the rear of the threshing device 5, and an input pulley 79a is connected to the left end of the sorting shaft 79. has been done. A relay pulley 80 is disposed between the input pulley 34a of the first object collecting section 34 and the input pulley 36a of the second object collecting section 36.

A transmission belt 81 is attached across the input pulley 77a of the winnowing machine 77, the input pulley 34a of the first object collecting section 34, the input pulley 36a of the second object collecting section 36, and the relay pulley 80. A transmission belt 82 is attached across the relay pulley 80 and the input pulley 79a of the sorting shaft 79.

As shown in FIGS. 18, 19, and 20, an input shaft 83 of the reaping section 3 is disposed below the drive case 47 along the left-right direction, and an input pulley 83a connected to the left end of the input shaft 83. A transmission belt 84 is attached across the transmission pulley 49a of the transmission shaft 49.

As shown in FIG. 10, the output pulley 33b of the engine 33 is disposed on the right side of the engine 33 on the opposite side of the threshing device 5, and a drive case 85 is provided at the front of the grain tank 6. There is. A transmission belt 86 is attached across the output pulley 33b of the engine 33 and the input pulley 85a of the drive case 85, and a discharge clutch 87 is provided to the transmission belt 86.

(State of power transmission to the threshing device, reaping unit, and grain tank)
As shown in the above-mentioned (configuration of power transmission to the threshing device and reaping section) and FIG. The signal is transmitted to the relay shaft 71.

As shown in FIGS. 10 to 13, the input pulley 72 and the transmission belt 73, which are the reaping and threshing transmission mechanism, are located on the opposite side of the first transmission belt 63 of the transmission mechanism 53 along the front-rear direction from the output shaft 33a of the engine 33. It is arranged so that it extends towards.

As shown in FIGS. 10 and 18, the power transmitted to the relay shaft 71 is transmitted to the winnowing machine 77 via the transmission belt 78, and then via the transmission belt 81 to the first item collection section 34 and the second item collection section. 36 and then to the sorting shaft 79 via the relay pulley 80 and the transmission belt 82.

As shown in FIGS. 18, 19, and 20, the power transmitted to the relay shaft 71 is transmitted to the handling cylinder 46 via the transmission belt 76 and the transmission shaft 49. As described above, the power transmitted to the relay shaft 71 is transmitted to each part of the threshing device 5.
The power transmitted to the relay shaft 71 is branched from the transmission shaft 49 and transmitted to the input shaft 83 via the transmission belt 84, and then transmitted from the input shaft 83 to each part of the reaping section 3.

As shown in FIG. 10, the power of the output pulley 33b of the engine 33 is transmitted to the bottom screw 38 via the transmission belt 86 (the transmission state of the discharge clutch 87) and the drive case 85. It is transmitted to the ejection device 24. By operating the discharge clutch 87 to the disconnected state, the bottom screw 38 and the discharge device 24 are stopped.

(Configuration of reaping and threshing clutch)
As shown in FIGS. 10 to 13 and FIGS. 18 and 19, a reaping and threshing clutch 88 that can be operated in a transmission state and a disconnection state is provided on the transmission belt 73, which is a reaping and threshing transmission mechanism. The components include a transmission belt 73 and a clutch arm 74.

In the reaping and threshing clutch 88, a balance-shaped clutch arm 74 is swingably supported on the left side of the relay shaft 71 and extends from the relay shaft 71 diagonally rearward and upwardly and diagonally forwardly and upwardly. A tension wheel 74a is rotatably supported at the rear of the clutch arm 74, and a return spring 75 is connected to the rear of the clutch arm 74. A reaping and threshing lever 89 is provided in the driving unit 4, and a linking rod 90 and a flexible spring 91 are connected between the reaping and threshing lever 89 and the front part of the clutch arm 74.

In the state shown in FIGS. 11, 12, and 13, the reaping and threshing lever 89 is operated to the transmission position, the linking rod 90 and the flexible spring 91 are operated upward in FIG. 75 in the clockwise direction in FIG. 13, and the tension ring 74a of the clutch arm 74 is pressed against the transmission belt 73. This state is a state in which the reaping and threshing clutch 88 is operated to a transmission state.

When the reaping and threshing clutch 88 is operated to the transmission state, the power of the output shaft 33a of the engine 33 is transmitted to the relay shaft 71 via the transmission belt 73, and from the relay shaft 71 to each part of the threshing device 5 and The signal is transmitted to each part of the reaping section 3.

When the reaping and threshing lever 89 is operated from the transmission position to the upper cutoff position, the linking rod 90 and the flexible spring 91 are operated downward in FIG. 13, and the clutch arm 74 is moved counterclockwise in FIG. 13 by the return spring 75. The tension ring 74a of the clutch arm 74 is moved upwardly away from the transmission belt 73. This state is a state in which the reaping and threshing clutch 88 is operated to the disconnected state, the power is shut off at the position of the transmission belt 73, and the threshing device 5 and the reaping section 3 are stopped.

A cover 92 is provided to cover the vicinity of the front of the input pulley 72, and prevents the transmission belt 73 from coming off the input pulley 72 when the reaping and threshing clutch 88 is operated to the disconnected state.

(Configuration of reaping clutch)
As shown in FIGS. 18, 19, and 20, a reaping clutch 93 that can be operated in a transmission state and a disconnection state is provided on the transmission belt 84. The reaping clutch 93 includes a transmission belt 84 and a clutch arm 94 as components.

In the reaping clutch 93, a clutch arm 94 is swingably supported on the left side of the input shaft 83, and a tension ring 94a is rotatably supported on the upper part of the clutch arm 94.
A reaping lever 95 is provided in the driving section 4, and a wire 96 and a flexible spring 97 are connected between the reaping lever 95 and an arm section 94b connected to the clutch arm 94.

In the state shown in FIG. 20, the reaping lever 95 is operated to the transmission position, the wire 96 and the flexible spring 97 are pulled downward in FIG. 20, and the clutch arm 94 is swung clockwise in FIG. The tension ring 94a of the clutch arm 94 is pressed against the transmission belt 84 due to the dynamic operation. This state is a state in which the reaping clutch 93 is operated to a transmission state.

When the reaping clutch 93 is operated to the transmission state, the power of the transmission shaft 49 is transmitted to the input shaft 83 via the transmission belt 84, and from the input shaft 83 to each part of the reaping section 3. In this case, it is necessary that the reaping and threshing clutch 88 (see the above-mentioned (Configuration of Reaping and Threshing Clutch)) is operated in a transmission state.

When the reaping lever 95 is operated from the transmission position to the upper cutoff position, the wire 96 and the flexible spring 97 are operated upward in FIG. 20, and the clutch arm 94 is swung counterclockwise in FIG. , the tension ring 94a of the clutch arm 94 separates from the transmission belt 84 forward. This state is a state in which the reaping clutch 93 is operated to the disconnected state, the power is shut off at the position of the transmission belt 84, and the reaping section 3 stops.

(Reversal configuration of reaping section)
As shown in FIGS. 18 and 19, a transmission shaft 98 extends rightward from the drive case 47, and a transmission pulley 98a connected to the right end of the transmission shaft 98 and the right end of the input shaft 83. A transmission belt 99 is attached across the output pulley 83b connected to the output pulley 83b. Inside the drive case 47, the bevel gear 46b of the handling barrel 46 and the bevel gear 98b connected to the left end of the transmission shaft 98 are engaged.

A reaping reversing clutch 100 operable in a transmission state and a disconnection state is provided on the transmission belt 99. The reaping reversing clutch 100 includes a transmission belt 99, a clutch arm 101, and a reversing lever (not shown) as components.

In the reaping reversing clutch 100, the clutch arm 101 is swingably supported on the right side of the transmission shaft 98, the tension wheel 101a is rotatably supported on the clutch arm 1010, and the reversing lever (not shown) is connected to the clutch. It is connected to arm 101.

When the reaping and threshing clutch 88 is operated in the transmission state, the power of the transmission shaft 49 becomes reverse power and is transmitted by the bevel gear 49b of the transmission shaft 49, the bevel gear 46b of the handling cylinder 46, and the bevel gear 98b of the transmission shaft 98. The signal is transmitted to the shaft 98.

In normal working conditions, the tension wheel 101a of the clutch arm 101 is separated from the transmission belt 99, the reaping reversing clutch 100 is operated in a disconnected state, and the power for reversing the transmission shaft 98 is not transmitted to the input shaft 83.
When the reaping section 3 is clogged with crops, etc., the reaping section 3 is operated in reverse to eliminate the clogged crop, etc. in the reaping section 3, as described below.

With the reaping and threshing clutch 88 being operated to the transmission state and the reaping clutch 93 being operated to the disengaged state, the clutch arm 101 is oscillated by holding the reversing lever and the tension ring 101a of the clutch arm 101 is pressed against the transmission belt 99. Then, the reaping reversing clutch 100 is operated to the transmission state.

As a result, the power for reversing the transmission shaft 98 is transmitted to the input shaft 83 via the transmission belt 99, and the reaping section 3 operates in the reverse direction. When the hand is released from the reversing lever, the clutch arm 101 immediately separates from the transmission belt 99, so the reaping reversing clutch 100 is operated to the disconnected state and the reaping section 3 is stopped.

(First alternative embodiment of the invention)
The first link 21 and the second link 22 may be configured to extend diagonally backward and downward from the axes P1 and P2, and to be able to swing around the axes P1 and P2 to the upright side and to the down side. .

According to this configuration, the hydraulic cylinder 27 is arranged in front of the first arm 21a of the first link 21. The hydraulic cylinder 27 extends and pushes the first arm 21a of the first link 21 backward (swinging operation), thereby swinging the first link 21 toward the upright side.
Accordingly, the second arm 22a of the second link 22 is swung rearward via the link 26, and the second link 22 is swung toward the upright side via the second arm 22a of the second link 22. The vehicle body 1 is operated to move upward relative to the traveling device 2 (track frame 17).

(Second alternative embodiment of the invention)
In the configuration shown in FIGS. 4, 5, and 6 (first alternative embodiment of the invention), the hydraulic cylinder 27 is connected to the second arm 22a of the second link 22, and the hydraulic cylinder 27 causes the second link 22 to swing. It may also be configured to be operated manually.

According to this configuration, when the second arm 22a of the second link 22 is oscillated by the hydraulic cylinder 27, the second link 22 is oscillated, and accordingly, the second arm 22a of the second link 22 is oscillated. The first arm 21a of the link 21 is operated to swing, and the first link 21 is operated to swing via the first arm 21a of the first link 21.

(Third alternative embodiment of the invention)
In the traveling device 2, the tension wheel 14 may be arranged at the rear end of the traveling device 2, and the drive wheel 13 may be arranged at the front end of the traveling device 2. According to this configuration, the mission case 51 is provided at the front of the aircraft body 1.

(Fourth alternative embodiment of the invention)
The second support portion 17b of the truck frame 17 may be eliminated, and the swing link 22c of the second link 22 may be directly swingably connected to the track frame 17 via the fulcrum shaft 25.
With this configuration, the fulcrum shaft 21c, which is the connection part between the first link 21 and the first support part 17a of the truck frame 17, is the fulcrum shaft 21c, which is the connection part between the second link 22 (swing link 22c) and the truck frame 17. It is arranged at a higher position than the shaft 25.

(Fifth alternative embodiment of the invention)
The horizontal frame 31 is connected and constructed across the rear side of the support portion (fulcrum shaft 21b) of the first link 21 in the first body side support portion 7a of the left and right front-to-back frames 7. It may be configured as follows.

The horizontal frame 32 is connected and constructed across the rear side of the support portion (fulcrum shaft 22b) of the second link 22 in the second body side support portion 7b of the left and right front-to-back frames 7. It may be configured as follows.

(Sixth alternative embodiment of the invention)
The horizontal frame 31 is connected and constructed over a portion above or below the support portion (fulcrum shaft 21b) of the first link 21 in the first body side support portion 7a of the left and right front-to-back frames 7. It may be configured so that

The horizontal frame 32 is connected and constructed over a portion above or below the support portion (fulcrum shaft 22b) of the second link 22 in the second body side support portion 7b of the left and right front-to-back frames 7. It may be configured so that

The present invention can be applied not only to ordinary combine harvesters, but also to self-extracting combine harvesters, and harvesters and work vehicles other than combine harvesters.

1 Body 2 Traveling device 7a First body side support part 7b Second body side support part 13 Drive wheel 14 Tension wheel 15 Rolling wheel 17 Track frame 17a First support part 17b Second support part 18 Crawler belt 21 First link 21a 1 arm 21b fulcrum shaft (location)
21c Fulcrum shaft (connection part)
22 Second link 22a Second arm 22b Fulcrum shaft (location)
25 Fulcrum shaft (connection part)
26 Link 27 Hydraulic cylinder 31 Horizontal frame (first horizontal frame)
32 Horizontal frame (second horizontal frame)
P1 axis (first axis)
P2 axis (second axis)

Claims (5)

Left and right running devices are provided that support the aircraft body, and include a drive wheel, a tension wheel, a roller, a track frame that supports the roller, and a crawler belt.
Left and right first support portions provided on the truck frame and extending upward from the truck frame;
left and right second support portions provided in a portion of the truck frame on the rear side of the first support portion and extending upward from the truck frame;
left and right first links supported by the aircraft body so as to be swingable around a first axis along the left-right direction;
left and right second links supported by a portion of the fuselage rearward of the first link so as to be swingable around a second axis along the left-right direction;
The first link and the second link are configured to be operated to move up and down with respect to the traveling device by swinging the first link and the second link,
The extending end of the right first link is swingably connected to the right first support part, and the extending end of the right second link is swingably connected to the right second support part. connected to,
The extending end of the left first link is swingably connected to the left first support part, and the extending end of the left second link is swingably connected to the left second support part. connected to,
the tension wheel is arranged at the front end of the traveling device, the drive wheel is arranged at the rear end of the traveling device,
A work vehicle in which the tension wheel is provided on an upper part of the first support part . The working vehicle according to claim 1, wherein a connection portion between the first link and the first support portion is located at a higher position than a connection portion between the second link and the second support portion. left and right first arms extending upward from a portion of the first link that is supported by the aircraft body;
left and right second arms extending upward from a portion of the second link that is supported by the aircraft body;
a left and right link connected across the first arm and the second arm;
left and right hydraulic cylinders that can be operated to push the first arm along the front-rear direction;
When the hydraulic cylinder pushes the first arm, the first link is swung toward the upright side, and the second link is swung toward the upright side via the link link and the second arm. The work vehicle according to claim 1 or 2, which is operated. left and right first body side support parts provided on the body and extending downward from the body;
left and right second body side support parts provided in a portion of the body on the rear side of the first body side support part and extending downward from the body,
The right first link is swingably supported by the right first body side support part, the right second link is swingably supported by the right second body side support part,
The left first link is swingably supported by the left first body support part, and the left second link is swingably supported by the left second body support part . The work vehicle described in any one of items 1 to 3 . A portion of the right first body side support portion that is adjacent to the support portion of the first link in the front-back direction; and a portion of the left first body side support portion that is adjacent to the support portion of the first link in the front and rear direction. a first horizontal frame constructed so as to span the
A portion of the right second body support portion that is adjacent to the support portion of the second link in the front-rear direction; and a portion of the left second body support portion that is adjacent to the support portion of the second link in the front-rear direction. 5. The work vehicle according to claim 4, further comprising a second horizontal frame constructed so as to extend over the area.

Images