Work vehicle

Abstract

To provide a work vehicle capable of performing work for discharging a harvest from a grain tank quickly even when a failure or the like occurs and capable of securing quickness of work.SOLUTION: A work vehicle A includes a reaping device 3, a cabin type driving part 5, a thresher 4, a grain tank 7, and a discharge auger 8 for discharging grains stored in the grain tank outside a machine body on a machine body frame 1 mounted with an engine E. The driving part is provided with an emergency discharge arm operated when discharging a harvest stored in the grain tank manually on an emergency basis, and a driving seat rear cover for covering the space between the driving seat and the grain tank in a front-back direction behind the driving seat. The driving seat rear cover includes an emergency discharge cover disposed above the emergency discharge arm that can be attached to or detached from a driving seat rear cover body. When an operator detaches the emergency discharge cover from the driving seat rear cover body, the emergency discharge arm is exposed on a driving seat side, and can be operated from the driving seat.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a work vehicle equipped with a grain tank for storing harvested products. [Background technology]

[0002] Conventional work vehicles of this type are known, for example, as described in Patent Document 1 and Patent Document 2 below. These conventional work vehicles are equipped with a harvesting device that harvests stalks in a field, a threshing device that threshes the stalks, a grain tank that stores the grains threshed by the threshing device, and a discharge auger that discharges the grains stored in the grain tank outside the vehicle. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-223891 A [Patent Document 2] JP 2020-174672 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, with conventional work vehicles, if the harvest stored in the grain tank cannot be discharged due to a failure of the clutch motor or the like, the worker must temporarily stop work, leave the cockpit, and manually operate the emergency discharge member to discharge the harvest stored in the grain tank, which requires a lot of time. In this way, the time spent on emergency discharge of the harvest stored in the grain tank may result in missed harvesting time, resulting in a decline in the quality of the harvest, or the time or weather suitable for harvesting may be missed, resulting in further loss of time in resuming work.

[0005] Therefore, an object of the present invention is to provide a work vehicle that can quickly discharge harvest crops from a grain tank even in the event of a malfunction, thereby ensuring the rapidity of work. [Means for solving the problem]

[0006] In order to achieve the above object, the first invention provides: A work vehicle equipped with a machine frame on which an engine is mounted, a harvesting device for harvesting stalks in a field, a cabin-type control section in which an operator sits and operates the machine, a threshing device for threshing the stalks, a grain tank for storing grains threshed by the threshing device, and a discharge auger for discharging the grains stored in the grain tank outside the machine, The operation section is provided with an emergency discharge arm behind the operator's seat for manually and urgently discharging the harvested crop stored in the grain tank, and a rear cover behind the operator's seat for covering a gap between the operator's seat and the grain tank, The present invention provides a work vehicle characterized in that the cockpit rear cover is disposed above the emergency ejection arm, and comprises a cockpit rear cover main body and a detachable emergency ejection cover, and an operator can remove the emergency ejection cover from the cockpit rear cover main body to expose the emergency ejection arm on the cockpit side and enable operation from the cockpit.

[0007] According to the first aspect of the present invention, when the harvest in the grain tank is to be discharged in an emergency, the operator removes the emergency discharge cover from the emergency discharge cover mounting portion provided on the cover body behind the driver's seat, thereby enabling the operation member related to the emergency discharge (i.e., the emergency discharge arm described below) to be operated. As a result, the harvest can be discharged quickly from the grain tank even in the event of a malfunction, etc. This ensures the rapidity of the work.

[0008] The second invention has the same configuration as the first invention, as well as: The emergency ejection cover is provided with a sealing member that seals the upper and lower gaps between the cockpit rear cover and the grain tank, and the sealing member is attached to the cockpit rear cover body by fastening it together with the emergency ejection cover, and is configured so that the sealing member can be removed from the cockpit rear cover body by removing the emergency ejection cover from the cockpit rear cover body.

[0009] According to the second invention, in addition to the effects of the first invention, when the emergency ejection cover 55 is removed from the cockpit rear cover body, the seal member is also removed from the cockpit rear cover body. This allows for easy and quick attachment and detachment without tools. Furthermore, it is easy to handle maintenance, etc.

[0010] The third invention has the following features in addition to the features of the first or second invention: The control section is characterized in that the exhaust purification device is arranged below and inside the cabin in the left-right direction, and is equipped with an exhaust purification device protective cover having a side cover portion formed to fit along the side of the aircraft, and an eave-shaped cover portion formed to extend like an eave from the side of the aircraft, and a roof portion is provided above the exhaust purification device on the inside of the aircraft that covers and protects the above of the exhaust purification device, and the gap between the exhaust purification device and the eave-shaped cover portion is configured to be larger in dimension than the gap between the exhaust purification device and the inclined edge of the roof portion.

[0011] According to the third invention, in addition to the effects of the first or second invention, by making the gap that serves as the air outlet of the engine cooling fan larger in size than the gap that serves as the air inlet, a layout with good ventilation is possible, which allows hot air to escape easily from the engine room and prevents the adverse effects of heat on the entire aircraft.

[0012] The fourth invention is, in addition to the configuration of the third invention, The present invention is characterized in that a rigid front plate, sound-proofing and vibration-proofing material, and a resin front cover are attached to the front part of the control section in that order from the inside of the aircraft, and a wall recess is formed in the side wall of the control section by recessing the aircraft wall inward.

[0013] According to the fourth aspect of the present invention, in addition to the effects of the third aspect of the present invention, By covering the front of the control section with a three-layer structure consisting of a rigid front plate, soundproofing and vibration-proofing material, and a front cover, it is possible to improve the strength and soundproofing and vibration-proofing properties while enhancing the design effect. Furthermore, by forming a recess in the wall, it is possible to arrange the exhaust purification device inside the left and right direction of the cabin while securing a transport path for the threshing device. This allows a compact configuration to be realized while protecting the exhaust purification device from the outside.

[0014] The fifth invention has the same configuration as the fourth invention, as well as: The pilot's seat includes a seat portion on which an operator sits, an axial damper seat base that supports a load so as to change the position of the seat portion, and a tilt adjustment mechanism that adjusts the tilt of the seat portion, The inclination adjustment mechanism is characterized in that it has a pair of left and right bending / extending link sections arranged on both the left and right sides of the axial damper sheet base, which can be bent and extended by a link, and the lower ends of the bending / extending link sections are fixed to a base plate that is inclined relative to the aircraft body.

[0015] According to the fifth aspect of the invention, in addition to the effects of the fourth aspect of the invention, the cockpit is provided with a tilt adjustment mechanism having a pair of left and right bending and extending link parts that can be bent and extended by a link, so that the tilt can be finely adjusted while smoothly following the change in the height of the seat. Furthermore, the base plate is inclined with respect to the airframe, which makes it difficult for dirt and water to accumulate.

[0016] The sixth aspect of the present invention, in addition to the configuration of the fifth aspect of the present invention, is as follows: The pair of left and right bending and extending link sections are composed of an upper link and a lower link capable of bending and extending, the upper link is fixed to the seat section by an upper link mounting section so that the mounting angle can be adjusted, and the lower link is fixed to the base plate by a lower link mounting section so that the mounting angle can be adjusted.

[0017] According to the sixth aspect of the invention, in addition to the effects of the fifth aspect of the invention, the angle of the seat can be finely adjusted, allowing an inclination suitable for the worker to be achieved, and fatigue can be significantly reduced. Effect of the Invention

[0018] According to the present invention, a work vehicle can be provided that can quickly discharge crops from a grain tank even in the event of a breakdown or the like, thereby ensuring rapid operation. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a schematic left side view of a work vehicle according to a preferred embodiment of the present invention. [Diagram 2] FIG. 2 is a plan view of the inside of the cabin of the cockpit of FIG. [Diagram 3] FIG. 3 is a plan view of the inside of the cabin of the cockpit when the cockpit rear cover of FIG. 1 is open. [Figure 4] FIG. 4 is a rear view of the inside of the cockpit cabin of FIG. 1. [Diagram 5] 5(a) is a plan view of the emergency ejection arm of FIG. 4 in an exploded state, and FIG. 5(b) is a plan view of the emergency ejection arm of FIG. 4 in an assembled state. [Figure 6] FIG. 6 is a front view of the inside of the cabin of the cockpit of FIG. [Figure 7] FIG. 7 is a front view of the inside of the cabin when the front cover of the control section of FIG. 1 is attached. [Figure 8] FIG. 8 is a bottom view of the control section of FIG. 1 as viewed from below. [Figure 9] FIG. 2 is a left side view of the outside of the cabin of the cockpit of FIG. [Figure 10]FIG. 10 is a rear view of the cockpit outside the cabin of FIG. [Figure 11] FIG. 11 is a front view of the cockpit of FIG. [Figure 12] FIG. 12 is a right side view of the same. [Figure 13] FIG. 13 is a rear view of the same. [Figure 14] FIG. 14 is an enlarged view of a main portion of the front end portion of the base plate shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] An embodiment specifically configured based on the above technical concept will be described below with reference to the drawings. In the description, front, rear, left and right are referred to based on the forward direction F of the work vehicle A. First, the basic configuration of the work vehicle A will be described below.

[0021] <1.Basic configuration> FIG. 1 is a schematic left side view of a work vehicle A according to a preferred embodiment of the present invention. A work vehicle A in a preferred embodiment of the present invention shown in Fig. 1 is configured as a so-called combine harvester, with a traveling device 2 consisting of a pair of left and right crawlers that travel on the soil surface provided on the underside of a machine frame 1, a reaping device 3 that harvests stalks in the field provided on the front side of the machine frame 1, a threshing device 4 that threshes and sorts the harvested stalks provided on the rear left side of the reaping device 3, and a control unit 5 on which an operator sits provided on the rear right side of the reaping device 3. This control unit 5 has various operating members arranged inside a box-shaped cabin.

[0022] An engine room 6 in which the engine E is mounted is provided below the control unit 5, a grain tank 7 for storing threshed and sorted grains is provided behind the control unit 5, and a discharge auger 8 consisting of a vertical discharge auger 8A extending in the vertical direction and a horizontal discharge auger 8B extending in the front-rear direction for discharging grains to the outside is provided behind the grain tank 7. In addition, an exhaust purification device 9 for purifying exhaust gas from the engine E is provided near the engine E in the engine room 6. This exhaust purification device 9 is equipped with a DPF that removes particulate matter in the exhaust gas discharged from the engine E, and an SCR catalyst that reduces and purifies nitrogen oxides in the exhaust gas after passing through the DPF with ammonia generated from urea water, and fulfills the function of purifying the exhaust gas before discharging it.

[0023] <2. Configuration of Control Unit 5> FIG. 2 is a plan view of the inside of the cabin of the control section 5 in FIG. 1, and FIG. 3 is a plan view of the inside of the cabin of the control section 5 in FIG. 1 when the rear cover of the cockpit is open. As shown in Fig. 2 and Fig. 3, the control section 5 is provided with various operating members 51 such as HST levers and a display 52 capable of displaying various information in front of the cockpit 50 where the operator sits. In addition, an electrical equipment box 53 accommodating various electronic devices is provided behind the cockpit 50, and a flat cockpit rear cover 54 formed with dimensions covering from the rear of the electrical equipment box 53 to the front of the grain tank 7 in a plan view is provided. That is, although not shown in Fig. 2 and Fig. 3, the front of the grain tank 7 is located below the rear of the cockpit rear cover 54. As a result, the cockpit rear cover 54 fulfills the function of covering the gap between the front and rear of the cockpit 50 and the grain tank 7.

[0024] The cockpit rear cover 54 is provided with a larger width than the cockpit 50, and includes a cockpit rear cover 54 main body, a removable emergency discharge cover 55, and a seal member 56 that is attached along the rear edge of the emergency discharge cover 55 and seals the upper and lower gaps between the cockpit rear cover 54 main body and the grain tank 7. The emergency discharge cover 55 is formed of a flexible, approximately trapezoidal flat plate member, and when urgently discharging the harvested crops in the grain tank 7, the operator can operate the operating member related to the emergency discharge (i.e., the emergency discharge arm 59 described later) from the cockpit 50 by removing the emergency discharge cover 55 from the emergency discharge cover mounting portion 54a provided on the cockpit rear cover 54 main body (see FIG. 3). The seal member 56 is arranged so that its front end overlaps the rear end lower portion of the cockpit rear cover 54, and is formed of a flexible material such as urethane or rubber.

[0025] Next, the structure for attaching and detaching the emergency ejection cover 55 will be described. The cockpit rear cover 54 has a plurality of bolt holes 54b at its rear end, the emergency ejection cover 55 has bolt holes 55c on the left and right sides, and the seal member 56 has a plurality of bolt holes 56a at its front end. As a result, the emergency ejection cover 55 and the seal member 56 are fastened together and attached to the cockpit rear cover 54 body by the star-shaped screw knob 55a and the bolt 55b that can be manually fastened and removed. As a result, when an operator manually operates the star-shaped screw knob 55a and the bolt 55b to remove the emergency ejection cover 55 from the cockpit rear cover 54 body, the seal member 56 is also configured to be removed from the cockpit rear cover 54 body. This allows for easy and quick attachment and removal without tools. Furthermore, it is well suited for maintenance and the like.

[0026] <3. Configuration of the rear of the control unit 5> FIG. 4 is a rear view of the inside of the cabin of the cockpit 5 of FIG. As shown in Fig. 4, behind the cockpit 50, there are provided an emergency discharge arm 59 that is operated by an operator when an emergency discharge of the harvested product (e.g., grains) stored in the grain tank 7 is performed manually by the operator, a discharge clutch motor 62 that is provided at the bottom of the grain tank 7 and switches on and off a discharge clutch (not shown) that discharges the harvested product stored in the grain tank 7 by rotating forward and backward, and a rod-shaped discharge tension arm 61 that cranks when the discharge clutch motor 62 is rotated in the off direction and pulls the discharge clutch cable 60 to turn the discharge clutch in the off state when a force equal to or greater than the tension of a tension spring 61s connected to one end is applied. When the discharge clutch motor 62 is rotated in the on direction, the discharge tension arm 61 moves due to the tension of the tension spring 61s, slackening the discharge clutch cable 60 and turning the discharge clutch in the on state.

[0027] The cockpit rear cover 54 can be attached by fitting a recess (not shown) provided on the underside of the front end to a protruding cover attachment part 57 provided to protrude upward from the aircraft body behind the cockpit 50 in the figure. The emergency ejection arm 59 is located directly below the emergency ejection cover 55 in Figures 2 and 3, and is therefore exposed on the cockpit 50 side by removing the emergency ejection cover 55, so that an operator can operate the emergency ejection arm 59 from the cockpit 50. This allows an operator to operate the emergency ejection arm 59 without leaving the cabin as in the past, and therefore ejection work can be performed quickly even in the event of a malfunction or the like.

[0028] Further, left and right cabin rear mounts 58L, 58R are provided below the cover mounting portion 57. The cabin rear mounts 58L, 58R are provided as a pair on the left and right sides of the engine frame EF (see FIG. 10) and are members that support the bottom of the cabin on the rear side of the machine body while preventing vibrations caused by traveling and machine body drive from being transmitted to the inside of the cabin. Next, the emergency ejection arm 59 will be described.

[0029] 5(a) is a plan view of the emergency ejection arm 59 in FIG. 4 in an exploded state, and FIG. 5(b) is a plan view of the emergency ejection arm 59 in FIG. 4 in an assembled state. 5(a) and 5(b), the emergency ejection arm 59 is formed by fastening a hexagonal nut 592 to an emergency ejection arm lower base 591 in a state in which the hexagonal nut 592 is sandwiched between an upper plate member 593. As a result, the emergency ejection arm 59 is formed with wrench insertion spaces 594 into which a general-purpose wrench can be inserted on both sides of the hexagonal nut 592. As a result, an operator can insert a general-purpose wrench into the wrench insertion space 594 when necessary, and use the general-purpose wrench as a lever to operate the emergency ejection arm 59.

[0030] Here, one end of the tension spring 61s is connected to the discharge tension arm 61, and the other end is connected to the emergency discharge arm 59. Therefore, an operator can move the discharge tension arm 61 by manually operating the emergency discharge arm 59 (see FIG. 4), thereby manually slackening the discharge clutch cable 60 and turning on the discharge clutch. This allows the harvested crop to be manually discharged from the grain tank 7 even if a failure occurs in the discharge clutch motor 62 or the electrical system.

[0031] <4. Configuration of the front part of the control unit 5> FIG. 6 is a front view of the inside of the cabin of the cockpit 5 of FIG. As shown in FIG. 6, below the various operating members 51 (HST lever in the illustrated example), a housing 63 that houses a transmission mechanism that transmits the operation of the various operating members is disposed, and a convex case 64 that houses the fulcrum shaft of the HST lever is disposed at the bottom of this housing 63. The brake pedal 66 is disposed to the right of the convex case 64 in a front view, below the housing 63, and at a position inside in the left-right direction, thereby making effective use of space. In addition, the height position of the brake pedal 66 when released is configured to be lower than the upper edge of a wall surface recess 66 formed on the side wall (left wall) of the control unit 5 by recessing the wall surface of the aircraft (cabin) toward the inside of the aircraft (cabin), and this prevents a situation in which the foot comes into contact with the step (wall surface recess 66) of the left wall when the brake pedal 66 is operated, resulting in deterioration of operability.

[0032] FIG. 7 is a front view of the inside of the cabin when the front cover of FIG. 1 is attached. As shown in FIG. 7, a rigid front plate 72, soundproofing and vibration-proofing material (insulator) 71, and a resin front cover 70 are attached to the front of the control unit 5 in this order from the inside of the aircraft. The front plate 72 functions to protect the control unit 5 and is formed of a single plate, with a simple configuration that allows costs to be reduced. The soundproofing and vibration-proofing material 71 is fixed between the front plate 72 and the resin front cover 70 with push rivets or adhesives without any gaps, and is configured to improve the soundproofing and vibration-proofing effect. The front cover 70 is configured to cover the entire surface of the soundproofing and vibration-proofing material 71 and to enhance the design effect. In this way, by covering the front of the control unit 5 with a three-layer structure of the rigid front plate, the soundproofing and vibration-proofing material 71, and the front cover 70, it is possible to improve the strength and soundproofing and vibration-proofing properties while enhancing the design effect.

[0033] FIG. 8 is a bottom view of the control section 5 of FIG. 1 as viewed from below. As shown in Fig. 8, the wall recess 66 is formed to the left of the center of the control section 5 (cabin) and is configured to be located approximately above the engine E. This makes it possible to arrange the exhaust purification device 9 inside the cabin in the left-right direction while ensuring a transport path for the threshing device 4. Also, inside the cabin, it is configured to be located to the left of the control seat 50, avoiding the front of the control seat 50 (see Fig. 6), so it is arranged in a position that does not come into contact with the feet of the operator seated in the control seat 50 and does not interfere with the operation of stepping on the brake pedal 66.

[0034] <5. Configuration of the exhaust purification device 9 and its surroundings> 9 is a left side view of the outside of the cabin of the control section 5 in FIG. 1, and FIG. 10 is a rear view of the outside of the cabin of the control section 5 in FIG. As shown in Figures 9 and 10, the exhaust purification device 9 is configured to be disposed below the cabin of the control section 5 and on the inside in the left-right direction. This allows the exhaust purification device 9 to be protected from the outside while achieving a compact configuration. The load of the cabin of the control section 5 is supported by rear cabin mounts 58L, 58R of the engine frame EF, but the exhaust purification device 9 is disposed on the left side of the engine frame EF. In addition, an exhaust purification device protective cover 80 that protects the exhaust purification device 9 is provided to the left of the engine frame EF and above the exhaust purification device 9.

[0035] The exhaust purification device protective cover 80 includes a side cover portion 81 formed along the side of the aircraft body, and an eave-shaped cover portion 82 formed extending from the side of the aircraft body in an eave-like shape. The side cover portion 81 covers the inside of the aircraft body in which the engine frame EF and the piping of the exhaust purification device 9 are arranged, and serves to improve the design effect of the aircraft side view. The eave-shaped cover portion 82 serves to protect the exhaust purification device 9 from contact and dirt. Although not shown, a soundproofing material is arranged on the inside side of the aircraft body of the exhaust purification device protective cover 80, and is configured to exhibit a soundproofing effect. The exhaust purification device protective cover 80 is configured not to cover the rear part of the exhaust purification device 9, and is designed not to prevent the release of hot air.

[0036] 10, a roof portion 74 that covers and protects the upper part of the exhaust purification device 9 is provided inside the aircraft body above the exhaust purification device 9, and the gap d1 between the exhaust purification device 9 and the eaves-like cover portion 82 is provided to be larger than the gap d2 between the exhaust purification device 9 and the inclined side of the roof portion 74. This allows for a well-ventilated layout by providing a larger gap d2, which is the air outlet, than the gap d1, which is the air inlet of the cooling fan of the engine E, allowing for good ventilation of the layout, allowing hot air to escape easily from the engine room 6, and preventing adverse effects of heat on the entire aircraft.

[0037] The cabin rear mount 87L is disposed to the right of the exhaust purification device 9, and is configured to be less susceptible to heat from the exhaust purification device 9. Also, it is designed to avoid the need for many members to ensure rigidity when it is provided on the exhaust purification device 9. Also, a harness lead-in space 73 is provided above the exhaust purification device 9 and to the left of the engine frame EF, which makes effective use of the space above the exhaust purification device 9 and allows the harness to be easily removed. As a result, assembly and maintenance are also easier.

[0038] The lower edge of the glass window 5M formed on the left side of the cabin of the control unit 5 is designed to slope downward toward the front, making it easier to operate the pulling gear change ahead of the harvesting device 3, and as the lower edge of the glass window 5M is positioned higher toward the rear end, the vertical distance from the harvesting device 3 and the threshing device 4 is maintained, making it possible to configure the machine to be less susceptible to the effects of dust.

[0039] <6. Configuration of cockpit 50> 11 is a front view of the cockpit 50 in FIG. 2, FIG. 12 is a right side view of the same, FIG. 13 is a rear view of the same, and FIG. 14 is an enlarged view of the main part of the front end portion of the base plate in FIG. 11 to 13, the cockpit 50 is equipped with a seat 501 on which an operator sits, an axial damper seat base 502 having an air damper function for supporting the load of the seat 501 and a height adjustment function by extension and retraction and configured to be able to change the attitude of the seat 501, and a tilt adjustment mechanism 90 capable of adjusting the tilt of the seat 501. Although not shown, the axial damper seat base 502 is equipped with a rotation shaft at the upper end, and is configured to be able to change the attitude by swinging the cockpit 50 up and down around the rotation shaft by the operator's operation.

[0040] The inclination adjustment mechanism 90 is provided with a pair of left and right bending and extending link parts 90L, 90R that can be bent and extended by links on the left and right sides of the shaft-shaped damper seat base 502, respectively. The left and right bending and extending link parts 90L, 90R are provided with an upper link 91 and a lower link 92. The upper link 91 is attached and fixed to the seat part 501 by an upper link attachment part 91t by bolt fastening, and the lower link 92 is attached and fixed to the base plate 503 by a lower link attachment part 92t by bolt fastening. In addition, the lower part of the upper link 91 and the upper part of the lower link 92 are fastened with bolts by a link fastening part 90r. As a result, when each bolt is loosened, the bending and extending link parts 90L, 90R can be bent and extended, and thus the inclination can be finely adjusted while smoothly following the change in height of the seat part 501. When adjusting the inclination adjustment mechanism 90, the operator can easily fix the inclination of the seat part 501 by tightening each bolt after setting the seat part 501 to the inclination desired by the operator. For the sake of convenience of the operation, it is preferable that the same parts are used for each bolt.

[0041] The base plate 503 is a plate-like member fixed to the airframe at an incline, which makes it difficult for dirt and water to accumulate. The axial damper sheet base 502 is disposed to penetrate the base plate 503, and the lower part of the axial damper sheet base 502 is supported by a damper lower fixing part 505 attached to a floor frame 504 forming the floor of the control section 5. As shown in FIG. 14, the front end of the base plate 503 is fixed to the floor frame 504 by a pilot seat side panel 506, which is fixed to the floor frame 504, and a reinforcing plate 505a is fastened to the pilot seat side panel 506 by a bolt fastening part 505b, and is further fixed to the base plate 503 by providing a bend from the middle part of the reinforcing plate 505a along the base plate 503, thereby improving the strength. As a result, the load on the seat section 501 can be well received.

[0042] The upper link mounting portion 91t and the lower link mounting portion 92t are configured so that the mounting angles of the upper link 91 and the lower link 92 can be adjusted and fixed by inserting fasteners (bolts and nuts) into the plate-shaped mounting portions for fixing. This allows fine adjustment of the angle of the seat portion 501. As a result, an inclination suitable for the worker's preferred posture can be realized, and fatigue can be significantly reduced.

[0043] The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims, and it goes without saying that these modifications are also included within the scope of the present invention. [Explanation of symbols]

[0044] A Work vehicle 1 Aircraft frame 2 Running gear 3 Reaping device 4. Threshing Equipment 5. Control Unit 6. Engine Room 7. Glentank 8. Discharge Auger 9. Exhaust purification equipment 50 Cockpit 51 Various operating parts 52 Display 53 Electrical box 54 Cockpit rear cover 55 Emergency ejection cover 56 Sealing material 57 Cover mounting part 58L, 58R Cabin rear mount 59 Emergency ejection arm 60 Discharge Clutch Cable 61 Eject tension arm 62 Discharge clutch motor 63 Case 64 Convex Case 66 Brake pedal 70 Front cover 71 Soundproofing and vibration-proofing materials (insulators) 72 Front Plate 74 Roof 80 Exhaust purification device protective cover 81 Side cover part 82 Eaves-shaped cover 90 Tilt adjustment mechanism 91 Top link 92 Downlink 501 Seat 502 Axial damper sheet base 503 Base Plate 504 Floor Frame EF engine frame

Claims

1. A work vehicle equipped with a machine frame on which an engine is mounted, a harvesting device for harvesting stalks in a field, a cabin-type control section in which an operator sits and operates the machine, a threshing device for threshing the stalks, a grain tank for storing grains threshed by the threshing device, and a discharge auger for discharging the grains stored in the grain tank outside the machine, The operation section is provided with an emergency discharge arm behind the operation seat for manually and urgently discharging the harvested crop stored in the grain tank, and a rear cover behind the operation seat for covering a gap between the operation seat and the grain tank, the cockpit rear cover is disposed above the emergency ejection arm and includes an emergency ejection cover that is detachable from the cockpit rear cover main body, and an operator can remove the emergency ejection cover from the cockpit rear cover main body to expose the emergency ejection arm on the cockpit side and to enable operation from the cockpit.

2. The work vehicle according to claim 1, characterized in that the emergency ejection cover is provided with a sealing member that seals the upper and lower gaps between the cockpit rear cover and the grain tank, the sealing member is attached to the cockpit rear cover body by fastening it together with the emergency ejection cover, and the sealing member can be removed from the cockpit rear cover body by removing the emergency ejection cover from the cockpit rear cover body.

3. A work vehicle as described in claim 1 or claim 2, characterized in that the control section is equipped with an exhaust purification device protective cover having a side cover portion formed to conform to the side of the aircraft body and an eave-shaped cover portion formed to extend from the side of the aircraft body in an eave-like shape, and above the exhaust purification device, a roof portion is provided on the inside of the aircraft body to cover and protect the above of the exhaust purification device, and the gap between the exhaust purification device and the eave-shaped cover portion is arranged to be larger than the gap between the exhaust purification device and the inclined edge of the roof portion.

4. The work vehicle according to claim 3, characterized in that a rigid front plate, sound-proofing and vibration-proofing material, and a resin front cover are attached to the front of the control unit in that order from the inside of the vehicle body, and a wall recess is formed in the side wall of the control unit by recessing the vehicle body wall inward.

5. The pilot's seat includes a seat portion on which an operator sits, an axial damper seat base that supports a load so as to change the position of the seat portion, and a tilt adjustment mechanism that adjusts the tilt of the seat portion, The work vehicle described in claim 4, characterized in that the inclination adjustment mechanism is provided with a pair of left and right bending and extending link portions arranged on both the left and right sides of the axial damper sheet base, which can be bent and extended by a link, and the lower ends of the bending and extending link portions are fixed to a base plate having an inclination relative to the body.

6. The work vehicle according to claim 5, characterized in that the pair of left and right bending and extending link sections are composed of an upper link and a lower link that are capable of bending and extending, the upper link is fixed to the seat section by an upper link mounting section so that an attachment angle thereof can be adjusted, and the lower link is fixed to the base plate by a lower link mounting section so that an attachment angle thereof can be adjusted.

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