Harvester

Abstract

To provide a harvester which is easily attached to a reaping device and includes a cover that can secure the strength even when it is lightweight.SOLUTION: A harvester includes: a reaping device 3 on the front side of a machine body moved by a travel device 2; a threshing device 4 which separates the grains from grain culms reaped by the reaping device 3; and side covers 50L, 50R which are provided on the left and right sides of the reaping device 3. The left and right covers 50L, 50R are each composed of upper reaping covers 53L, 53R on the left and right sides, and lower reaping covers 54L, 54R on the left and right sides. Connection protrusions 55L, 55R formed so as to protrude to the lower portions of the upper reaping covers 53L, 53R on the left and right sides are connected by inserting them to connection recesses 56L, 56R formed by recessing the upper portions of the lower reaping covers 54L, 54R on the left and right sides.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to a cover that covers the sides of a cutting device of a harvesting machine.

Background Art

[0002] In a conventional harvesting machine, there is known a technology related to a combine in which a cutting cover that covers the left and right sides of a cutting device in the vertical direction is offset from a cutting frame to the front side of the machine body, and a discharge port for straw debris staying between the cutting cover and the cutting frame is formed. (See Patent Document 1)

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the technology of Patent Document 1, since the left and right side covers are long in the vertical direction, they are likely to bend, and when attaching a part to the cutting frame during installation, the other part moves in a direction of separation due to the reaction force, resulting in a problem that extra time is required for the installation work.

[0005] Also, if there is a deviation in the position where it is first attached to the cutting frame, a deviation will also occur in other attachment positions, resulting in a problem that the attachment work takes time.

[0006] An object of the present invention is to provide a harvesting machine equipped with a cover that is easy to attach to a cutting device and can ensure strength even when being lightweight, in order to solve the above problems.

Means for Solving the Problems

[0007] The present invention that has solved the above problems is as follows. The invention according to claim 1 is In a harvester provided with a cutting device (3) on the front side of the machine body that travels with a traveling device (2) and a threshing device (4) that separates grains from the cereal straw cut by the cutting device (3), side covers (50L, 50R) are respectively provided on the left and right sides of the cutting device (3). The left and right side covers (50L, 50R) are each composed of left and right upper cutting covers (53L, 53R) and left and right lower cutting covers (54L, 54R). Connecting convex portions (55L, 55R) formed to protrude from the lower portions of the left and right upper cutting covers (53L, 53R) are inserted into and connected to connecting concave portions (56L, 56R) formed by recessing the upper portions of the left and right lower cutting covers (54L, 54R). A plurality of lower ribs (57L, 57R) are provided at intervals in the front-rear direction on the outer side walls (55La, 55Ra) on the outer side of the machine body of the connecting convex portions (55L, 55R). A plurality of lower holding ribs (61L, 61R) are provided at intervals in the front-rear direction on the lower surface side of the lower walls (59Lb, 59Rb) of the connecting concave portions (56L, 56R). When connecting the upper cutting covers (53L, 53R) and the lower cutting covers (54L, 54R) to form the side covers (50L, 50R), the lower ribs (57L, 57R) and the lower holding ribs (61L, 61R) are arranged at positions where the front and rear coincide. The harvesterIt is as follows.

[0008]

[0009]

[0010]

[0011]

Advantages of the Invention

[0012] According to the invention of claim 1, by constructing the left and right side covers (50L, 50R) by connecting the upper cutting covers (53L, 53R) and the lower cutting covers (54L, 54R) respectively, the vertical length is suppressed, so that the working time of the left and right side covers (50L, 50R) can be shortened.

[0013] Also, compared with the one in which the left and right side covers (50L, 50R) are integrally formed, the upper cutting covers (53L, 53R) and the lower cutting covers (54L, 54R) are each lighter in weight, so that the labor required for the attachment and detachment work can be reduced.

[0014] Further, by inserting and connecting the connecting convex portions (55L, 55R) of the upper cutting covers (53L, 53R) into the connecting concave portions (56L, 56R) of the lower cutting covers (54L, 54R), the vertical connecting position is easy to understand, and noise and wear can be prevented from occurring due to vibration during traveling and harvesting operations.

[0015]

[0016]

[0017]

[0018]

[0019]

Brief Description of the Drawings

[0020]

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Mode for Carrying Out the Invention

[0021] As shown in FIGS. 1 to 3, the combine harvester is provided with a traveling device 2 consisting of a pair of left and right crawlers on the lower side of the machine body frame 1, and a cutting device 3 for harvesting the cereal straws growing in the field is provided on the front side of the machine body frame 1. Further, a threshing device 4 for threshing and sorting the cereal straws harvested by the cutting device 3 is provided on the rear left side of the cutting device 3, and a control unit 5 for the operator to board is provided on the rear right side of the cutting device 3.

[0022] Below the control unit 5, an engine room 6 for mounting the engine E is provided. Behind the control unit 5, a grain tank 7 for storing the grains that have been threshed and sorted by the threshing device 4 is provided. The grains stored in the grain tank 7 are discharged to the outside by a discharge auger 70 connected to the grain tank 7. In front of the driver's seat of the control unit 5, a front panel 10 is provided, and on the left side of the driver's seat, a side panel 15 is provided.

[0023] On the left part of the front panel 10, a monitor 11 for displaying the output rotation etc. of the engine E is provided, and on the right part, an operation lever 12 for operating the turning of the traveling device 2 and the raising and lowering of the mowing device 3 is provided. Note that the posture of the operation lever 12 is measured by an angle sensor 12S such as a potentiometer mounted on the lower part of the operation lever 12.

[0024] Also, on the front left part of the floor located below the front panel 10, a parking brake pedal 13 for operating and releasing the operation of a pair of left and right brake devices 38 provided in a transmission 21 described later is provided, and on the front right part of the floor, a scraping pedal 14 for connecting and disconnecting a mowing clutch described later is provided.

[0025] Note that the depressed posture of the parking brake pedal 13 is measured by a sensor 13S such as a limit switch or a contact sensor mounted on the lower part of the parking brake pedal 13, and the depressed posture of the scraping pedal 14 is measured by a sensor 14S such as a limit switch or a contact sensor mounted on the lower part of the scraping pedal 14.

[0026] On the front part of the side panel 15, a main shift lever (the "shift lever" in the claims) 16 for operating a continuously variable transmission 20 for increasing and decreasing the output rotation speed of the engine E and switching the rotation direction is provided, and behind the shift lever 16, a threshing and mowing lever 18 for operating the connection and disconnection of the mowing clutch 22 and the threshing clutch 23 is provided.

[0027] As shown in FIG. 4, the output rotation output from the engine E is transmitted to the continuously variable transmission 20 provided on the transmission path (the "first transmission path" in the claims) A. The output rotation of the engine E transmitted to the input shaft 44 of the continuously variable transmission 20 is increased or decreased in speed and the rotation direction is switched by the continuously variable transmission 20 and then transmitted to the transmission 21.

[0028] The output rotation of the continuously variable transmission 20 transmitted to the input shaft 30 of the transmission 21 is output from the output shaft 34 via an internal transmission mechanism (not shown) and transmitted to the traveling device 2. The traveling speed v of the traveling device 2 is measured by a speed sensor 2S such as a tachogenerator mounted on the track wheel or a gyro mounted on the airframe frame 1. The output rotation output from the output shaft 31 of the transmission 21 is transmitted to the mowing device 3 via the mowing clutch 22.

[0029] Also, the output rotation output from the engine E is transmitted to the threshing device 4 via the threshing clutch 23 provided on the transmission path (the "second transmission path" in the claims) B.

[0030] As shown in FIG. 5, the output rotation of the continuously variable transmission 20 is transmitted to the input shaft 30 of the transmission 21. The output rotation transmitted to this input shaft 30 is transmitted to the countershaft 32 via the gear 30A, the gear 31A, and the gear 32A. The gear 30A is provided on the input shaft 30, the gear 31A is rotatably provided on the output shaft 31, and the gear 32A is provided on the countershaft 32.

[0031] The output rotation transmitted to the countershaft 32 is transmitted to the countershaft 33 via the gear 32B and the gear 33A. The gear 32B is provided on the countershaft 32, and the gear 33A is provided on the countershaft 33.

[0032] The output rotation transmitted to the countershaft 33 is transmitted to the output shaft 34 via a pair of left and right gears 33B provided on both sides of the gear 33A and a pair of left and right 34A. The gear 33B is provided on the countershaft 33, and the gear 34A is slidably provided in the left and right directions on the output shaft 34.

[0033] On both sides of the pair of left and right gears 33B of the countershaft 33, a brake device 33C for braking the rotation of the countershaft 33 is provided. Thereby, when the operation lever 12 is tilted to the left, the rotation speed of the left gear 33B becomes slower than the rotation speed of the right gear 33B, and the traveling device 2 is turned to the left side in the traveling direction. When the operation lever 12 is tilted to the right, the rotation speed of the right gear 33B becomes slower than the rotation speed of the left gear 33B, and the traveling device 2 can be turned to the right side in the traveling direction.

[0034] The output rotation transmitted to the output shaft 34 is transmitted to the input shaft 35 of the traveling device 2 via a pair of left and right gears 34B provided outside the gear 34A and a pair of left and right 35A. The gear 34B is provided on the output shaft 34 so as to be slidable in the left and right directions, and the gear 35A is provided on the input shaft 35.

[0035] The output rotation transmitted to the countershaft 32 is transmitted to the output shaft 31 via the gear 32C and the gear 31B, or via the gear 32D and the gear 31C. The gears 32C and 32D are provided on the countershaft 32, and the gears 31B and 31C are provided on the output shaft 31 so as to be slidable in the left and right directions. Further, the gears 31B and 31C can be moved in the left and right directions via a shifter 36 by operating a shifter device (not shown).

[0036] The output rotation transmitted to the output shaft 31 is transmitted to the input shaft 37 of the cutting device 3 via the cutting clutch 22.

[0037] As shown in FIG. 6, when the shift lever 16 is in the neutral position, the output rotation of the continuously variable transmission 20 becomes zero. When the shift lever 16 is tilted forward from the neutral position, the rotation direction of the output rotation of the continuously variable transmission 20 is the same positive rotation as the rotation direction of the output rotation of the engine E. When the tilt angle of the forward tilt position is increased, the output rotation of the continuously variable transmission 20 is increased in speed, and when the tilt angle of the forward tilt position is decreased, the output rotation of the continuously variable transmission 20 is decreased in speed. Further, when the shift lever 16 is tilted rearward from the neutral position, the rotation direction of the output rotation of the continuously variable transmission 20 is the reverse rotation opposite to the rotation direction of the output rotation of the engine E. When the tilt angle of the rearward tilt position is increased, the output rotation of the continuously variable transmission 20 is increased in speed, and when the tilt angle of the rearward tilt position is decreased, the output rotation of the continuously variable transmission 20 is decreased in speed. Note that the position of the shift lever 16 is measured by an angle sensor 16S such as a potentiometer attached to the lower part of the shift lever 16.

[0038] When the mowing lever 18 is in the forward tilt position, the connection between the mowing clutch 22 and the threshing clutch 23 is released. When the mowing lever 18 is in the rearward tilt position, the mowing clutch 22 and the threshing clutch 23 are connected. Further, when the mowing lever 18 is in the neutral position located between the forward tilt position and the rearward tilt position, the connection of the mowing clutch 22 is released and the threshing clutch 23 is connected. Note that the position of the mowing lever 18 is measured by a mowing sensor 18S such as a potentiometer attached to the lower part of the mowing lever 18.

[0039] As shown in FIG. 7, a sector gear 41 is supported on the trunnion shaft 40 of the continuously variable transmission 20. Gears formed on the outer peripheral portion of the sector gear 41 are engaged with a gear 42A provided on the output shaft of a forward motor (the "driving means" in the claims) 42 and a gear 43A provided on the output shaft of a reverse motor (the "driving means" in the claims) 43. Thereby, based on the position of the shift lever 16, that is, the measured value of the angle sensor 16S, the forward motor 42 and the reverse motor 43 are driven to rotate the trunnion shaft 40 of the continuously variable transmission 20, so that the increase / decrease in speed and the switching of the rotation direction of the output rotation of the engine E can be performed. Note that the output rotation of the engine E is transmitted to the input shaft 44 of the continuously variable transmission 20.

[0040] Further, FIG. 7 shows a form in which the trunnion shaft 40 of the continuously variable transmission 20 is rotated by the forward motor 42 and the reverse motor 43 via the sector gear 41. However, an arm extending radially is supported on the trunnion shaft 40 of the continuously variable transmission 20, and a forward cylinder driven by a forward solenoid and a reverse cylinder driven by a reverse solenoid are connected to the outer peripheral portion of this arm. It can also be in the form of connecting.

[0041] FIG. 8(a) shows the attitude of the shift lever 16 on the horizontal axis and the measured value θ of the angle sensor 16S on the vertical axis. When the shift lever 16 is moved from the neutral attitude to the forward tilt attitude, the measured value θ of the angle sensor 16S increases linearly. In the present embodiment, when the shift lever 16 is moved to the neutral attitude, the measured value θ of the angle sensor 16S is set to θ1, and when the shift lever 16 is moved to the maximum forward tilt attitude where it is tilted most forward, the measured value θ of the angle sensor 16S is set to θ2.

[0042] FIG. 8(b) shows the measured value θ of the angle sensor 16S on the horizontal axis and the opening β of the trunnion shaft 40 of the continuously variable transmission 20 on the vertical axis. When the shift lever 16 is moved from the neutral attitude to the maximum forward tilt attitude and the measured value θ of the angle sensor 16S increases from θ1 to θ2, the opening β of the trunnion shaft 40 also increases linearly. In the present embodiment, when the measured value θ of the angle sensor 16S is θ1, the opening β of the trunnion shaft 40 is set to β1, and when the measured value θ of the angle sensor 16S is θ2, the opening β of the trunnion shaft 40 is set to β2.

[0043] The opening β of the trunnion shaft 40 is set to increase linearly from β1 to β3 which is larger than β2. Thereby, when the shift lever 16 is moved to the maximum forward tilt attitude and the traveling speed v2 of the traveling device 2 is lower than the set traveling speed V2, the opening β of the trunnion shaft 40 can be made even larger than β2 to increase the traveling speed v2 to the set traveling speed V2.

[0044] FIG. 8(c) shows the opening β of the trunion shaft 40 of the continuously variable transmission 20 on the horizontal axis and the set traveling speed V of the traveling device 2 on the vertical axis. When the opening β of the trunion shaft 40 increases from β1 to β2, the set traveling speed V of the traveling device 2 also increases linearly.

[0045] In this embodiment, when the opening β of the trunion shaft 40 is β1, the set traveling speed V of the traveling device 2 is set to V1, and when the opening β of the trunion shaft 40 is β2, the set traveling speed V of the traveling device 2 is set to V2. When the opening β of the trunion shaft 40 is β3, it is set to V3 which is higher than V2. Thus, when the shift lever 16 is moved from the neutral position to the maximum forward tilt position, the set traveling speed V of the traveling device 2 increases from V1 to V2, and ideally the traveling speed v of the traveling device 2 can also increase from v1 to v2.

[0046] As the basic layout of the combine, as shown in FIGS. 1 to 3, a threshing device 4 for threshing and sorting and conveying the straw cut by the cutting device 3 is provided on one side of the left and right of the body frame 1, and a grain tank 7 for storing the threshed grains is arranged on the other side of the left and right.

[0047] And, as shown in FIGS. 9(a)(b) and 10(a)(b), on the left and right sides of the cutting device 3, cutting side covers 50L and 50R for preventing the straw adjacent to the cutting operation strip from entering the cutting operation part and contacting the transmission mechanism are respectively attached. Removable openings 52L and 52R are respectively formed in these cutting side covers 50L and 50R.

[0048] As shown in FIGS. 9(a)(b) and 10(a)(b), the left and right cutting side covers 50L and 50R are such that the shapes of the respective cutout portions 51L and 51R on the rear side of the body are different.

[0049] As shown in FIGS. 11(a) and 11(b), the left cutting side cover 50L is formed by connecting the upper left cutting cover 53L and the lower left cutting cover 54L. On the lower side of the upper left cutting cover 53L, within the front-rear and left-right widths at the bottom of the upper left cutting cover 53L and protruding downward, a connecting convex portion 55L is formed. On the upper side of the lower left cutting cover 54L, a connecting concave portion 56L corresponding to the connecting convex portion 55L is formed.

[0050] The outer side wall 55La of the connecting convex portion 55L is a plate-like shape in the front-rear direction without a gap except that a plurality of first mounting holes 55Lz... for mounting fixing members such as bolts (not shown) are formed in the front-rear direction. Near the central portion in the vertical direction of the front side wall 55Lb at the front end portion, a U-shaped front mounting groove 55Ly with the inside of the machine body cut out is formed, and the rear side wall 55Lc at the rear end portion is formed shorter than the vertical width of the front side wall 55Lb.

[0051] Also, the lower wall 55Ld and the bottom of the upper left cutting cover 53L have cutouts of the same shape formed on the inside of the machine body. On the lower wall 55Ld, lower ribs 57L... are formed at predetermined intervals. Further, on the bottom of the upper left cutting cover 53L, upper ribs 58L... that are triangular in a front (rear) view are formed at positions corresponding to the upper parts of the lower ribs 57L... and the upper part of the rear side wall 55Lc.

[0052] Note that a rear mounting groove 55Lx with the inside of the machine body cut out is formed behind the last upper rib 58L.

[0053] Also, from the lower front end to the upper part of the upper left cutting cover 53L, it has a rearwardly inclined posture, and bends downward by drawing an acute arc near the top. And from the front end to the rear of the machine body, a straight portion where the connecting convex portion 55L is formed is formed. The rear end portion bends upward by drawing an arc close to a right angle and then inclines rearwardly upward to merge with the vertical straight portion on the upper side of the rear end portion. That is, the upper left cutting cover 53L has a shape in which a right-angled portion of a right triangle is cut out into a shape approximating a triangle in a side view.

[0054] In addition, a rectangular window portion for passing a lock mechanism (not shown) for attaching the cover is formed at the rear part of the upper left cutting cover 53L and near the vertical straight line portion.

[0055] Next, as shown in FIGS. 12(a) and 12(b), the lower left cutting cover 54L notches the inner side of the upper end surface of the machine body, and forms a front side wall 59Lb, a rear side wall 59Lc, and a lower wall 59Ld with a space corresponding to the front-rear width and the vertical length of the connecting convex portion 55L, and no structure is provided on the inner side of the machine body, thereby forming a connecting concave portion 56L. Note that the lower wall 59Ld is disposed below the lower end portions of the front side wall 59Lb and the rear side wall 59Lc, and the vicinity of the lower end portions of the front side wall 59Lb and the rear side wall 59Lc acts as a rib member. Further, a receiving groove 58Lx corresponding to the rear mounting groove 55Lx is formed behind the rear side wall 59L.

[0056] Also, a U-shaped front mounting groove 58Ly with the inner side of the machine body notched is formed in the front side wall 59Lb. Above the machine body of the lower wall 59Ld and between the front and rear of the front side wall 59Lb and the rear side wall 59Lc, a plurality of upper mounting ribs 60L... having a second mounting hole 58Lz at a position corresponding to the first mounting hole 55Lz... of the connecting convex portion 55L are formed, and upper ribs 62L not having the second mounting hole 58Lz are formed between these front and rear. And a plurality of triangular or trapezoidal lower holding ribs 61L... are formed below the machine body of the lower wall 59Lb at an interval narrower than the front-rear interval of the upper mounting ribs 60L... and the upper ribs 62L.

[0057] The portion where the connecting concave portion 56L is formed at the upper part of the lower left cutting cover 54 is straight in the front-rear direction. The front end portion of this straight portion has a front-downward inclined posture toward the lower front side of the machine body, is reversely bent downward in an arc shape at the foremost part, and forms a straight portion with a rear-downward inclined posture toward the rear of the machine body. The rear end portion thereof has a rear-upward inclined posture upward at a position below the connecting concave portion 56.

[0058] Furthermore, the rear end of the upward-sloping posture portion has a straight-line portion that is nearly vertical toward the upper straight-line portion after drawing an arc and heading toward the front side of the aircraft body. In a side view, the upper side has a trapezoidal shape and the lower side has a shape close to a right-angled triangle, and a notch space is formed on the rear side of the upper part of the aircraft body.

[0059] Note that a rectangular window portion for passing a lock mechanism (not shown) for attaching the cover is formed near the inclined straight-line portion on the front side of the lower left cutting cover 54L.

[0060] By combining the upper left cutting cover 53L and the lower left cutting cover 54L above and below, the left cutting side cover 50L is configured.

[0061] At this time, the plurality of upper ribs 58L..., lower ribs 57L..., and lower holding ribs 61L... are arranged at front and rear positions arranged in the vertical direction. As a result, the plurality of ribs receive and disperse the load, so the load on the fixing members such as bolts attached during connection is reduced, and it is possible to prevent the fixing members from breaking due to the load and the connection state from being released.

[0062] Next, the right cutting side cover 50R is configured by connecting the upper right cutting cover 53R and the lower right cutting cover 54R. As shown in FIGS. 13(a) and (b), on the lower side of the upper right cutting cover 53R, within the front-rear and left-right widths of the bottom of the upper right cutting cover 53R and protruding downward, a connecting convex portion 55R is formed, and on the upper side of the lower right cutting cover 54R, a connecting concave portion 56R corresponding to the connecting convex portion 55R is formed.

[0063] The outer wall 55Ra of the connecting convex portion 55R is a plate-like shape in the front-rear direction without a gap except that a plurality of first mounting holes 55Rz... for attaching fixing members such as bolts (not shown) are formed in the front-rear direction. Near the central portion in the vertical direction of the front side wall 55Rb at the front end portion, a U-shaped front mounting groove 55Ry with the inside of the aircraft body cut out is formed, and the rear side wall 55Rc at the rear end portion has a notch formed in an inverted L shape on the inside of the aircraft body when viewed from the back.

[0064] Further, the bottom of the lower wall 55Rd and the bottom of the upper right cutting cover 53R have notches of the same shape formed on the inner side of the machine body. On the lower wall 55Rd, lower ribs 57R... are formed at predetermined intervals. Further, on the bottom of the upper right cutting cover 53R, upper ribs 58R... that are triangular in a front (rear) view are formed at positions corresponding to the upper part of the lower ribs 57R... and the upper part of the rear wall 55Rc, respectively.

[0065] Note that a rear mounting groove 55Rx with the inner side of the machine body cut out is formed behind the uppermost upper rib 58R.

[0066] Also, from the lower part to the upper part of the front end of the upper right cutting cover 53R, it has a rearwardly rising inclined posture. Near its top, it forms a protrusion toward the front side of the machine body once and then bends rearward while drawing an obtuse arc, forming the front and rear parts on the upper side of the machine body. And while forming an inclined part from the rear end parts of the front and rear parts toward the lower part of the rear side of the machine body, it has an inclined surface that draws an acute arc and heads downward and forward, and this inclined surface gradually reduces the inclination angle in the middle and further heads toward the front side of the machine body. After bending at an angle close to vertical downward of the machine body near the center of the front and rear of the machine body, its lower end part is connected to the rear part of the lower wall 55Rd.

[0067] As a result, the upper right cover 53R has a trapezoidal shape in a side view and has a notch part that is long in the front - rear direction under the rear side of the machine body.

[0068] Next, as shown in FIGS. 14(a) and (b), the lower right cutting cover 54R notches the inner side of the upper end surface of the machine body, and with an interval corresponding to the front - rear width and the up - down length of the connecting convex part 55R, a front wall 59Rb, a rear wall 59Rc, and a lower wall 59Rd are provided, and by not providing anything on the inner side of the machine body, a connecting concave part 56R is formed. Note that the lower wall 59Rd is arranged above the lower end part of the front wall 59Rb and below the lower end part of the rear wall 59Rc, and the rear end part of the lower wall 59Rd is configured to be inclined upward toward the lower end part of the rear wall 59Rc. Note that there is a protruding part acting as a rib member near the lower end part of the front wall 59Rb, but there is no protruding part at the lower part of the rear wall 59Rc.

[0069] Also, on the front wall 59Rb, a U-shaped front mounting groove 55Ry with the inside of the machine body cut out is formed. Above the machine body on the lower wall 59Rd and between the front and rear of the front wall 59Rb and the rear wall 59Rc, a plurality of upper mounting ribs 60R... having a second mounting hole 58Rz at a position corresponding to the first mounting hole 55Rz... of the connecting convex part 55R are formed. And on the lower side of the machine body of the lower wall 59Rd, a plurality of lower holding ribs 61R... are formed at the same interval as the front and rear intervals of the upper mounting ribs 60R... and the upper ribs 62R. Also, behind the connecting recess 56R, a receiving groove 58Rx corresponding to the rear mounting groove 55Rx is formed by a notch.

[0070] These upper mounting ribs 60R... and lower holding ribs 61R... are preferably in the shape of a scalene triangle or a scalene trapezoid, or a shape approximating these.

[0071] The portion where the connecting recess 56R is formed at the upper part of the lower right cutting cover 54 is straight in the front-rear direction. The front end of this straight part of the machine body is in a downwardly inclined posture towards the lower front side of the machine body, reversely bends downward in an arc shape at the foremost part, and is a straight part in a downwardly inclined posture towards the rear of the machine body, and its rear end is in an upwardly inclined posture towards the upper side at a position below the connecting recess 56.

[0072] Furthermore, the upwardly inclined posture part is directed towards the upper rear part of the machine body at a more acute angle in the middle and is connected to the rear end of the upper front-rear straight part. Thereby, it has an overall trapezoidal shape in a side view, and a notch space in the shape of a right triangle above is formed at the rear side of the machine body.

[0073] Note that near the inclined straight part on the front side of the lower right cutting cover 54R, a rectangular window part for passing a lock mechanism (not shown) for attaching the cover is formed.

[0074] By combining these upper and lower upper right cutting covers 53R and lower right cutting cover 54R, the right cutting side cover 50R is constituted.

[0075] By combining the upper right cutting cover 53R and the lower right cutting cover 54R above and below, the right cutting side cover 50R is formed. At this time, the lower holding rib 61R located at the lower part of the upper rib 62R is arranged at the front and rear positions aligned vertically with the upper rib 58R and the lower rib 57R of the upper cutting cover 53R. The upper mounting rib 60R... that forms the second mounting hole 58Rz... is arranged at a position where the front and rear positions do not overlap with the upper rib 58R... and the lower rib 57R... of the upper cutting cover 53R. As a result, it is difficult for a shift to occur in the front and rear positions between the first mounting hole 55Rz... and the second mounting hole 58Rz. Therefore, a fixing member such as a bolt can be inserted to easily and surely assemble the upper cutting cover 53R and the lower cutting cover 54R, improving work efficiency. By inserting the connecting convex portions 55L, 55R having a shape similar to the box shape into the connecting concave portions 56L, 56R having a shape similar to the box shape, and inserting and fixing a fixing member across the first mounting holes 55Lz..., Rz and the second mounting holes 58Lz..., Rz, the left and right cutting covers 50L, 50R are configured. This makes it easy to align the left and right upper cutting covers 53L, 53R and the lower cutting covers 54L, 54R when assembling, and can prevent the generation of gaps that can catch the cereal straws at adjacent working positions that are not the cutting target.

[0076] This can prevent the cereal straws at adjacent working positions from getting caught in the gaps and causing part of the cereal straws, especially the ear tips that are the harvesting targets, to be torn off when the cereal straws touch the left and right side covers 50L, 50R, and can prevent a decrease in yield and quality.

[0077] Also, by aligning the box-shaped connecting concave portions 56L, 56R and the connecting convex portions 55L, 55R, even if the workers who attach and detach the left and right side covers 50L, 50R are different, they can be uniformly positioned. Thus, proper assembly is possible without being affected by rules of thumb or skill levels.

[0078] Also, on the upper and lower sides of the lower walls 59Ld, 59Rd of the box-shaped connecting concave portions 56L, 56R and the lower walls 55d, 55Rd of the connecting convex portions 55L, 55R, a plurality of ribs (57L, 57R, By forming (58L, 58R, 60L, 60R, 61L, 61R) in the vertical direction, sufficient strength of the lower walls 55d, 55Rd, 59Ld, 59Rd can be ensured.

[0079] In addition, since the connecting convex portions 55L, 55R and the box-shaped connecting concave portions 56L, 56R do not have walls on the inner side of the machine body, they can be connected or separated even if they are moved slightly in the diagonal up-and-down direction, improving work efficiency.

[0080] Also, when removing the left and right side covers 50L, 50R for maintenance or the like, by first removing the fixing members such as bolts that connect the left and right upper cutting covers 53L, 53R and the left and right lower cutting covers 54L, 54R and separating the upper and lower parts, the size and weight of the cover parts to be removed can be reduced, and the labor for the attachment and detachment work can be reduced.

[0081] In addition, since the shapes of the left and right side covers 50L, 50R are different, they do not interfere with the structures such as the transmission mechanisms on the side closer to the operating unit 5 and the side closer to the threshing device 4, preventing a decrease in work efficiency, preventing the left and right from being mistaken during assembly, and shortening the working time related to maintenance.

[0082] The threshing device 4 is configured such that the grain straw cut by the cutting device 3 while the machine body is advanced by the traveling device 2 is continuously conveyed, and the grain straw is clamped and conveyed rearward while separating the grains at the ear tips. However, there is a case where the operator manually sets the grain straw cut manually without moving the combine and threshes it on the feed chain of the threshing device 4. This is an operation performed after manually cutting some of the grain straw before the cutting and harvesting operation by the combine to create a path for the combine to enter the field, or after the approximate cutting and harvesting operation in the field is completed, when the operator manually cuts the grain straw left uncut by the combine, and is also called a handling operation.

[0083] When performing this handling operation, the handling operation lever 71 provided in the threshing device 4 is operated to the handling operation position. As a result, the output upper limit of the continuously variable transmission 20 is corrected downward, and the conveyance speed of the grain straw is decelerated (by approximately 30%) compared to when traveling.

[0084] Also, when an excessive amount of grain straw is input at once, or when the operator's work gloves or hands themselves are caught by the feed chain, a load that does not occur when inputting a normal amount of grain straw is generated. Therefore, a load sensor 72 for detecting this load is provided. When the load sensor 72 enters the detection state, the threshing clutch 23 that turns on and off the transmission to the threshing device 4 is shut off by operating the corresponding threshing on / off motor 23a.

[0085] As described above, in order to reduce the risk of the handling operation in which the operator has to bring their hand close to the drive unit such as the feed chain to input the grain straw and also has to input an appropriate amount of grain straw themselves, upper limit regulation of the output and emergency stop when pinched are incorporated.

[0086] Note that depending on the work mode, when the operator performs the handling operation, they stop the traveling of the combine, get off from the control unit 5, and stand on the side of the threshing device 4. At this time, if the output of the continuously variable transmission 20 is operated to 0 (neutral), the machine body will stop traveling. However, if the handling operation lever 71 is operated to perform the handling operation and the continuously variable transmission 20 enters the output state, there is a risk that the driving force will also be transmitted to the traveling device 2 and the machine body will move.

[0087] In order to prevent such problems from occurring, when the operator gets off the machine from the control unit 5 to perform the handling operation, it is necessary to operate the parking brake pedal 13 to make the machine body immovable even if the driving force is transmitted to the traveling device 2. Also, if there is another operator in the driver's seat and they forget that the handling operation is in progress and operate the output operation of the machine body or the engagement and disengagement of the clutch, etc., the conveyance speed of the feed chain may increase or the machine body may start to move. Therefore, it is desirable that there is no operator in the control unit 5.

[0088] Therefore, a seating sensor 74 for detecting whether an operator is on board or not by means of load is provided on the driver's seat 5a of the control unit 5.

[0089] In addition, an engine stop switch 75 is provided near the control unit 5 and near the conveyance start end side of the feed chain, which, when pushed, stops the engine E, and also stops the traveling device 2, the mowing device 3, and the threshing device 4. When this engine stop switch 75 is pushed, it becomes in the off state by the internal spring force, and it does not return to the original position unless a predetermined force is applied and turned after being pushed, and if it is not in the original position, the restart of the engine E is not accepted.

[0090] In an emergency, by operating the engine stop switch 75, when the grain straw or a hand is pinched, the handling work can be immediately stopped, so that damage to the machine body and injury to the operator can be prevented. The operation of this engine stop switch 75 shall be accepted with priority over the operation states of other sensors, switches, and levers.

[0091] Note that if, after operating this engine stop switch 75 to stop the engine E, without eliminating the cause leading to the stop operation, the handling work can be resumed simply by operating the engine stop switch 75 again, the same problem will occur again, and there is a high possibility of falling into a situation where the engine E is stopped again.

[0092] Therefore, after the forced stop of the engine E, it is desirable that the output of the continuously variable transmission 20 is 0 and the driving force to the traveling device 2, the mowing device 3, and the threshing device 4 is cut off.

[0093] In order to maintain the above-mentioned safe configuration, as shown in FIGS. 15 and 16, an angle sensor 16S such as a potentiometer is provided at the lower part of the shift lever 16, and a brake sensor 13a for detecting whether the parking brake pedal 13 is operated to the operating position is provided. When the engine stop switch 75 is operated to forcibly stop the engine E, and an attempt is made to start the engine E by key operation, the electrical system is turned on, and the presence or absence of detection by the seat sensor 74, the brake sensor 13a, and the angle sensor 16S, or the detection values are acquired.

[0094] At this time, if the seat sensor 74 does not detect, the angle sensor has a value of 0 (neutral position), and further, if the brake sensor 13a detects the brake position, the control device 100 can energize the solenoid to push and rotate the engine stop switch 75 and return it to the original position. By returning the engine stop switch 75 to the original standby position, starting of the engine E, that is, energization by key operation, can be accepted.

[0095] By requiring the above-mentioned restart operation of the engine E, since the operator needs to manually create a state where safety during work is ensured, there is no need to frequently perform the forced stop operation of the engine E.

[0096] An intention mechanism such as the above-mentioned restart regulation of the engine E can also be used to improve safety during handling work.

[0097] When the angle sensor 16S detects that the above-mentioned shift lever 16 is in the neutral position and the brake sensor 13a detects that the parking brake pedal 13 is depressed and in the parking state, when the handling work lever 71 is operated, the threshing clutch 23 that turns on and off the transmission to the threshing device 4 is set to the connected state, and the continuously variable transmission 20 is configured to output from 0 to the set output. In this case, although the driving force is transmitted to the threshing device 4 and the conveyance and threshing operations of the cereal straw are performed, the driving force is not transmitted to the traveling device 2, and even if it is transmitted, the state where it cannot travel is maintained. Therefore, it is possible to prevent the machine body from suddenly moving during the handling work.

[0098] As a result, the handling work can be performed safely and stably.

[0099] In addition, when there are multiple operators, one operator stands at the control unit 5 to check the handling work state of other operators. If a problem occurs, the operator may sit on the driver's seat 5a to make the seat sensor 74 in the detected state and stop the handling work.

[0100] If the cereal straw gets clogged, the operator doesn't get too flustered. However, when work gloves or the like are caught in the conveyance or the hand itself is pinched, the operator performing the handling work may not be able to make a normal judgment and may not be able to quickly press the engine stop switch 75.

[0101] Therefore, when a sense of discomfort occurs during the handling work, the operator in the control unit 5 can stop the engine E or stop the transmission to the threshing device 4 just by sitting on the driver's seat 5a. Thus, it is possible to ensure the safety of the work and prevent the operator from being injured.

[0102] However, even with the above configuration, if the handling work lever 71 is operated toward the work side while satisfying the conditions, the feed chain continues to move. Therefore, there is a problem that an operator who is not used to the handling work has difficulty properly placing the cereal straw on the feed chain.

[0103] To address this problem, as shown in Fig. 17, a wired foot pedal 77 that an operator steps on with their foot for operation is provided in the empty space of the control unit 5 or the like, and a connection coupler 77b is attached to the end of the connection cable 76a of this wired foot pedal 77.

[0104] And on the front side of the body of the threshing device 4 and outside the body, a receiving coupler 77c that meshes with the connection coupler 77b is provided. By connecting the connection coupler 77b and the receiving coupler 77c, while stepping on the wired foot pedal 77, the continuously variable transmission 20 can be configured to transmit power to the threshing device 4 with the set output as the limit. Note that when the operation of the wired foot pedal 77 stops, the output of the continuously variable transmission 20 decreases towards 0, but the engine E is assumed not to stop.

[0105] As a result, transmission to the feed chain is performed only while stepping on the wired foot pedal 77. Therefore, when loading the cereal straws, by reducing the speed of the feed chain or completely stopping it, the cereal straws can be threshed by the threshing device 4 in a stable posture.

[0106] Also, since the operation of the wired foot pedal 77 determines the presence or absence of the operation of the feed chain, when the cereal straws are likely to get clogged or when the work gloves are likely to be caught, when the operation of the wired foot pedal 77 stops, the feed chain also stops immediately, preventing damage to the machine body and injury to the human body.

[0107] A plurality of lifting devices 80 are provided in the left - right direction on the mowing device 3 to lift the cereal straws and foliage lying on the field and reliably separate them from the field with the mowing blades, and are configured to lift multiple rows of cereal straws as the machine advances for mowing and harvesting.

[0108] These lifting devices 80... are mounted on a branch transmission case 82... provided on a lifting transmission shaft 81 provided across the left - right direction near the upper end of the mowing device 3, as shown in Figs. 18 and 19, and are configured to obtain driving force.

[0109] Between the left and right sides of the above-described causing device 80..., as the machine body moves forward, the cereal straw continuously enters. However, when the diameter of the cereal straw has become thick due to growth or when it is wet with water such as rain, the causing operation may not work well, resulting in stagnation and clogging, and the cutting device 3 may stop moving.

[0110] At this time, the operator needs to remove the cereal straw to eliminate the clogging. However, since the causing devices 80... are each fixedly provided, after moving the cutting device 3 slightly upward, it is necessary to open the cutting device 3 with one of the left and right sides of the cutting device 3 as the rotation fulcrum by the opening and closing mechanism and perform the operation of removing the clogged cereal straw.

[0111] To perform the above operation, operations such as raising and lowering the cutting device 3, releasing the lock, and opening and closing are required. Therefore, there is a problem that the working time is long and the interruption time of the harvesting operation becomes long.

[0112] To solve this problem, among the plurality of causing devices 80... provided in the left and right directions of the cutting device 3, the left and right outer causing devices 80L and 80R remain fixed as before, and one or more rotating causing devices 80C... located between the left and right are pivotally mounted on the weeding frame 83... provided at the lower part of the cutting device 3 via a pivot shaft 84 so as to be rotatable back and forth. The upper side of this rotating causing device 80C... is connected in such a way that when rotated to the rear side of the machine body, a causing transmission shaft (not shown) extending from the branched transmission case 82... upward to the front side above the machine body is inserted.

[0113] Furthermore, the upper part of the causing cover 85 provided on the front side of the machine body is formed longer above the left and right causing covers 85 to form upper extending portions 85a respectively. Notched holes 85b in the left and right directions are formed in the upper extending portions 85a.

[0114] And, an upper cover 86 is provided above the cutting device 3 and covering the front, rear, and upper sides of the causing transmission shaft 81. Among this upper cover 86, the portion located above the upper part of the rotating causing device 80C is a lock cover 86a... that can rotate in the vertical direction, and lock hooks 86b that enter the notched holes 85b are respectively formed at the lower end portions.

[0115] By inserting the above lock hook 86b into the notch hole 85b, the forward and backward rotation of the rotation induction device 80C is restricted. When the lock cover 86a is rotated upward to pull out the lock hook 86b from the notch hole 85b, the rotation induction device 80C can rotate forward and backward.

[0116] Actually, the upper side of the rotation induction device 80C... and the branch transmission case 82... are also connected by a fixing member such as a bolt. By releasing the connection, the forward and backward rotation becomes possible.

[0117] Note that depending on the number of cutting rows, the branch transmission case 82 is provided with a pair, i.e., two rotation induction devices 80C. Therefore, by making the lock cover 86a... also the same width as the two rotation induction devices 80C, 80C, the man-hours for the disconnection operation can be reduced. At this time, the lock hooks 86b are formed in the same number as the notch holes 85b at the upper part of the rotation induction device 80C.

[0118] The plurality of rows of grain straws cut by the above cutting device 3 are transported to the feed chain of the threshing device 4 in a row as the transport path converges into one as it goes toward the rear of the cutting device 3. However, a relay transport device 87 is arranged between the front and rear of the cutting device 3 and the threshing device 4, and the converged and aligned grain straws are sent out rearward. This relay transport device 87 obtains a driving force from the same drive source as the cutting device 3 etc., and drives a relay chain (not shown) in which medium-diameter lugs 88... are arranged at predetermined intervals in a circulating manner. Similar to the chains in other parts, it requires periodic lubricating oil injection.

[0119] Therefore, an automatic oiling device is placed on the circulating trajectory of the relay chain, set to the oiling state, and the relay chain is circulated, so that the operator can perform the oiling operation without contacting the oiling device with the relay transport device 87, preventing the occurrence of malfunctions due to chain jumping or seizure caused by insufficient lubricating oil.

[0120] Since the switching operation unit for the oil supply state and non-oil supply state of this automatic oil supply device is arranged with the relay conveyor 87 closer to one side of the left and right of the machine body, it is provided near the rear of the end of one side of the left and right of the cutting device 3, that is, near the outer end of the machine body.

[0121] As a result, the operator can switch between the oil supply state and the non-oil supply state without removing the cover or the like from the machine body, so that the time and labor required for maintenance work such as oil supply are reduced.

[0122] However, if the operator forgets to switch from the automatic oil supply state to the non-oil supply state after the oil supply work, the lubricating oil will continue to be sequentially supplied during the operation of the relay conveyor 87. As a result, an excessive amount of lubricating oil will be used, and the lubricating oil will scatter around due to the centrifugal force during turning, and may adhere to the middle-diameter lug 88, etc., soiling the grain straw.

[0123] By intentionally enlarging the operation range of the switching operation member to determine whether the automatic oil supply device is in the oil supply state or the non-oil supply state, so that the operation position can be judged from a distance by appearance, or by providing a switch or sensor for detecting the operation position, and providing a lamp or the like on the control unit 5 to light up when in the oil supply state, it is possible to prevent the cutting and harvesting operation of the grain straw from being carried out while in the oil supply state.

[0124] However, since the switching operation member of the automatic oil supply device is provided near the end of one side of the left and right of the machine body, when switching from the oil supply state to the non-oil supply state, the operator needs to temporarily leave the control unit 5 to perform the switching operation, which causes a problem of consuming extra working time and labor. Especially, In medium to large-sized machines with a cabin provided in the control unit 5, getting on and off considering the opening and closing of the door and the height takes some time, so the consumption of time and labor increases.

[0125] In order to address the above problem, as shown in Fig. 21, an automatic lubricating oil supply device 90 is disposed in a non-conveying area of a non-conveying relay chain that does not convey the cereal straws, on the other side of the left and right sides of the body of the relay conveying device 87 and on the rear side of the body, i.e., in the relay lug 88.... This automatic lubricating oil supply device 90 is arranged vertically on an oil supply support stay 91 provided on the upper cover 87a of the relay conveying device 87 so that lubricating oil naturally falls from above downward and an oil supply port that allows the lubricating oil to flow down when it contacts the relay chain faces the upper surface of the relay chain. This oil supply support stay 91 has a base connected to the upper cover 87a and is provided in a posture protruding upward, and is not supported by other frames or the like.

[0126] Then, an oil supply switching lever 92 for opening and closing the oil supply port of the automatic lubricating oil supply device 90 is arranged at a position above the automatic lubricating oil supply device 90 and at a position where an operator boarding the control unit 5 can easily operate it with a margin when extending an arm (the left arm when facing the forward direction of the body) toward one side of the left and right sides of the body. Note that when performing the switching operation between the oil supply state and the non-oil supply state, the oil supply switching lever 92 is displaced by 90 to 180 degrees for each position, so that it can be visually determined from the control unit 5 which state it is in. This makes it easier to prevent starting the cutting and harvesting operation with the automatic lubricating oil supply device 90 in the oil supply state, so that it is possible to prevent the cereal straws from adhering to the lubricating oil, prevent a decrease in the harvest amount, and prevent the discharged straws with lubricating oil adhering to them from being discharged onto the field and the lubricating oil from flowing out into the soil and water.

[0127] Also, by preventing the lubricating oil from scattering to areas where the supply of lubricating oil is not required, wasteful consumption of the lubricating oil and the occurrence of lubricating oil removal work are prevented, and it is prevented that the operator spends extra time and labor.

[0128] Moreover, when there is a possibility that the relay conveying device 87 may perform abnormal operations due to insufficient lubricating oil due to forgetting maintenance work, by interrupting the cutting operation and switching the automatic lubricating oil supply device 90 to the oil supply state to perform the oil supply work, it is possible to prevent clogging from occurring when the cereal straws being conveyed are sent to the feed chain due to the inoperability of the relay conveying device 87 and prevent the cutting and harvesting operation from being interrupted.

[0129] In addition, since it is possible to prevent the relay conveyor device 87 from being damaged by baking and the mowing and harvesting operation from becoming impossible, the mowing and harvesting operation of the cereal straw can be performed without missing the appropriate harvesting time, and the quality deterioration of the harvested product can be prevented.

[0130] In a conventional combine, the speed increase / decrease switching of the output rotation of the continuously variable transmission is performed via a transmission. However, it is necessary to provide a plurality of members that connect the internal transmission gear group and the sub-shift lever for switching these gear groups, which requires securing the arrangement space for the linkage members and limits the layout of the sub-shift lever.

[0131] Moreover, when a mechanism for linking the sub-shift lever and the transmission gear mechanism is provided, a space is generated around the arrangement location of the linkage members, making it easier for vibration and outside air to be transmitted from the arrangement position of the sub-shift lever to the periphery of the operator's cab. This outside air may make the operator feel overly hot depending on the ambient temperature, and furthermore, it may contain chaff generated during mowing, threshing, straw discharging, etc. of the mowing and harvesting operation, as well as dust generated by traveling, which may cause a problem of imposing an extra burden on the operator and making them tired.

[0132] In an open-top combine with the periphery of the operator's cab exposed, the above problems are minor, and it is possible to reduce the load by the operator's own ingenuity in taking dust and heat prevention measures. However, in a combine equipped with a cabin 5b with the periphery and above of the operator covered and equipped with an air conditioner, the gaps around the sub-shift lever become a path for outside air with heat and moisture, as well as fine contaminants generated by the mowing and harvesting operation and traveling to enter, resulting in a problem of impairing airtightness.

[0133] To solve this problem, as shown in FIGS. 22 to 24, an output speed change solenoid 110a is provided in the continuously variable transmission 20 to change and stop the rotation of the output side, i.e., the motor side shaft, of the continuously variable transmission 20 which receives the operation position of the shift lever 16 detected by the angle sensor 16S and operates in response to a signal from the control device 100. Further, an input speed change solenoid 110b is provided to change or stop the rotation of the input side, i.e., the pump side.

[0134] Note that the lower part of the shift lever 16 is not provided with a member such as a transmission rod connected to the continuously variable transmission 20 or the like, and is pivotally mounted on the mounting portion of the side panel 15 so as to be rotatable forward and backward. The portion other than the movement groove of the shift lever 16 formed above this mounting portion has a sealed configuration that is not connected to the outer periphery of the cabin 5b.

[0135] By using the above configuration, the driving force input to the transmission 21 can be continuously increased or decreased by increasing or decreasing the rotational speeds of the output shaft and the input shaft with the output speed change solenoid 110a and the input speed change solenoid 110b, and the speeds of traveling, mowing, harvesting, and conveying can be adjusted more finely than with a gear shift mechanism.

[0136] Also, since no space is formed that connects the inside and outside of the cabin 5b, it is less affected by the outside air, preventing a decrease in air conditioning efficiency. At the same time, it is possible to prevent foreign matters such as straw fragments and dust from entering the cabin 5b and making the operator feel uncomfortable, thus maintaining the habitability inside the cabin 5b.

[0137] Further, by stopping the rotation of the input shaft and the output shaft of the continuously variable transmission 20 with the input speed change solenoid 110b and the output speed change solenoid 110a, the driving force can be cut off without using a clutch or the like.

[0138] In the above configuration, when traveling on a so-called stepping board, which is often tilted when entering and leaving the field or loading and unloading the machine body on the truck bed or the like, it is also possible to travel at a lower speed than before.

[0139] Note that the neutral position that shuts off the driving force to the traveling device 2 and only stops traveling, the working speed for increasing and decreasing the vehicle speed within a relatively low speed range suitable for the work of cutting cereal straws, and the switching to the moving speed for increasing and decreasing the vehicle speed from low speed to high speed for moving without performing work are to be carried out by the sub-shift switch 17.

[0140] The sub-shift switch 17 may be configured such that each time one switch is pressed, the neutral position, the working speed, and the moving speed are switched in order, or three switches may be provided and configured to switch to the one that has been operated among the neutral position, the working speed, and the moving speed.

[0141] Regarding the adjustment of this low-speed traveling, the operator may manually operate the shift lever 16. However, since the output of the continuously variable transmission device 20 also increases and decreases due to the difference in the fine operation amount of the shift lever 16, if the operator accidentally touches the shift lever 16 while moving the machine body, there is a risk of unintentionally increasing the speed, causing unnecessary mental burden to the operator, or damaging the machine body due to falling off the footboard.

[0142] Also, due to the weight of the machine body and the ground resistance, the output decreases to the extent that the machine body does not move, or the output stops, and it becomes necessary to finely operate the shift lever 16 to increase the output from that state, and the operator has to perform fine operations.

[0143] Since the difficulty of the above fine adjustment operation varies depending on individual senses and the proficiency in operating the machine body, the function for safely and stably entering and exiting the field and loading onto the loading platform actually hinders the convenience of operation.

[0144] Therefore, as shown in FIGS. 23 and 24, on the side panel 15 of the control unit 5, there is provided a low-speed switch 111 which, when operated, activates the input shift solenoid 110b and the output shift solenoid 110a via the control device 100, enabling the vehicle body to surely move forward even when the traveling device 2 is affected by the ground resistance and the gravity due to the inclination, and automatically adjusting the output to a low speed, i.e., an extremely low speed, at which minute deviations in the traveling direction can be corrected. The operation control of the input shift solenoid 110b and the output shift solenoid 110a when the low-speed switch 111 is operated shall be based on the control program recorded in advance in the control device 100, as shown in FIG. 25 and the like.

[0145] The operation of the low-speed switch 111 is performed when the continuously variable transmission 20 is in a state of outputting a speed within a range suitable for traveling with respect to the operation amount of the shift lever 16. However, if the output is suddenly decreased at this time, minute vibrations will occur in the transmission system, play will occur in the traveling device, the operator will be shaken and the fatigue feeling will increase, and there will be problems such as a load being applied to the transmission system and the durability being reduced.

[0146] Therefore, as shown in FIG. 25, when the low-speed switch 111 is operated, first, the input shift solenoid 110b is activated in a direction of decreasing toward the extremely low speed set value, reducing the output on the input side. Then, when a predetermined time has elapsed since the start of the operation of the input shift solenoid 110b side, the output shift solenoid 110a is activated in a direction of decreasing toward the extremely low speed set value, reducing the output on the output side.

[0147] When a multi-speed type, for example, a two-speed type, is used for the output shift solenoid 110a, it is assumed that the switching is performed to the low-speed side for fine adjustment, and when a stepless transmission type is used, the operating speed is controlled via an inverter or the like.

[0148] In the above description, the operation of the output shift solenoid 110a is started during the operation of the input shift solenoid 110b. However, it may be adjusted according to the time when the operation of the input shift solenoid 110b is completed after a certain period of time, or it may be a control program in which the operation of the output shift solenoid 110a is started after the operation of the input shift solenoid 110b is completed.

[0149] As described above, since the shock generated from the transmission system when the continuously variable transmission 20 switches to the extremely low speed mode can be significantly reduced, vibration of the machine body is prevented, and a decrease in operability, a load on the transmission system, and the occurrence of fatigue of the operator are prevented.

[0150] When the above continuously variable transmission 20 is a stepless shift type, simultaneous control of the input side and the output side is possible. Therefore, as a control program for operating the input shift solenoid 110b and the output shift solenoid 110a simultaneously, the occurrence of shocks during output reduction can also be suppressed.

[0151] During the operation of the above extremely low speed travel, it is conceivable to move forward and backward for fine adjustment. Also, since there is a risk of sudden acceleration when the extremely low speed mode is released during extremely low speed travel, the shift lever 16 shall not have a function to release the extremely low speed travel in accordance with operations such as releasing the extremely low speed mode when operated to a certain position. Although the shift lever 16 may be provided with switches that can be operated while being held to improve the convenience of operation, it is desirable not to provide those related to the operation of the extremely low speed mode to prevent misoperation.

[0152] As described above, it is possible to prevent not only the unintentional release of the extremely low speed but also the problem of accidentally switching to the extremely low speed mode during work travel or movement travel, which would result in wasting extra time.

[0153] Although the above cannot cancel the extremely low speed mode from the shift lever 16, as shown in Fig. 26, an angle sensor 16S such as a potentiometer that detects the operation amount of the shift lever determines that the operation position of the shift lever 16 is neutral, and when a predetermined time (e.g., 30 to 60 seconds) elapses while remaining in the neutral position, the extremely low speed state is cancelled. When the shift lever 16 is operated forward or backward, the continuously variable transmission 20 may be configured to output in the working speed mode.

[0154] To prevent misoperation, as shown in Figs. 23 and 24, the low speed switch 111 is arranged inside a recess 112 formed on the rear side of the machine body with respect to the operation range of the shift lever 16 and on the side of the mowing lever 18 in the side panel 15 of the control unit 5. The upper end height of this recess 112 is set such that there is no interference even when the shift lever 16 is operated to the maximum rearward position. In order to make it easy for the operator seated in the operator's seat 5a to reach out and operate, the wall portion facing the operator is cut out or the like so that the vertical height is lower than the wall portions on the front, rear, left, and right other sides.

[0155] This can prevent accidentally operating the low speed switch when operating the shift lever 16, which is frequently operated during working travel and moving travel, and entering the extremely low speed mode, thus wasting extra time.

[0156] Also, basically it is not operated except in the running stop state. Moreover, by forming the recess 112 on the side of the mowing lever 18 and cutting out the wall portion, it is easy for the operator to operate the low speed switch 111, and the continuously variable transmission 20 can be surely switched to the extremely low speed mode when necessary.

[0157] It is assumed that the cancellation of the extremely low speed mode is performed by pressing the low speed switch 111. At this time, as shown in Fig. 26, regardless of the shift setting before being operated to the extremely low speed mode, the input shift solenoid 110b and the output shift solenoid 110a operate so as to output based on the working speed mode, and the output of the continuously variable transmission 20 is changed to a configuration that does not result in a moving speed mode enabling higher speed running.

[0158] Accordingly, when the low-speed switch 111 is operated, it is possible to switch from the extremely low-speed mode to the working speed mode, so there is no need to stop the running during the switching operation, and the time required for the work can be shortened.

[0159] In addition, it is also possible to operate the shift lever 16 in the extremely low-speed mode to switch the continuously variable transmission 20 to the neutral setting, stop the running, and then operate the low-speed switch 111 to enter the working speed mode.

[0160] In the above, although a configuration for preventing misoperation of the low-speed switch 111 has been adopted, as a result of the operator reaching out without looking at the side panel 15, it is quite possible to misidentify and operate another switch. When the above misoperation occurs while moving forward while cutting the cereal straw, the conveyance of the cereal straw becomes slow due to insufficient output, jamming occurs, and the cut cereal straw is not conveyed to the threshing device 4. At the same time, the traveling speed becomes slow, and there is a problem that the working time increases.

[0161] In order to prevent the occurrence of this problem, as shown in FIG. 27, when the threshing sensor 18S that detects the operation position of the threshing lever 18 detects the operation to the threshing position, the control device 100 determines that it is in the cutting operation running, and even if the low-speed switch 111 is operated, the control configuration is such that no actuation signals are sent to the input shift solenoid 110b and the output shift solenoid 110a, and the switching to the extremely low-speed mode is not performed.

[0162] As a result, even if the low-speed switch 111 is accidentally operated, the output of the current continuously variable transmission 20 is maintained, so that the occurrence of jamming of the cereal straw is prevented, sudden deceleration is prevented, and the working efficiency is improved.

[0163] As shown in Fig. 28, when the above-mentioned cutting sensor 18S detects the operation of the cutting lever 18 to the cutting position in the state of being switched to the extremely low speed mode by the operation of the low speed switch 111, the traveling speed is maintained at the extremely low speed, and the cutting device 3 and the threshing device 4 are driven at high speed, and the configuration is switched to the lodging mode. At this time, the control device 100 operates the cutting speed change motor 114 provided in the transmission 21, and switches the output to the cutting device 3 and the threshing device 4 to increase the operating speed.

[0164] In the lodging mode, while moving at a lower speed than during normal cutting and harvesting operations, the raising device 80 that rotates at high speed is brought into contact with the lodged cereal culms, so that it is easier to cut the cereal culms at the root side and make them in a posture that is easy to be clamped and conveyed along the conveyance path to the threshing device 4.

[0165] This can prevent the ear tips with paddy rice, which are the harvesting targets, from being cut off, reducing the yield and requiring extra labor for collecting the ear tips. In addition, it can prevent the cereal culms from being clamped and conveyed in a posture unsuitable for conveyance, and prevent the interruption of work due to clogging of the cereal culms.

[0166] Regarding the traveling speed, it is desirable to be equivalent to the speed based on the output of the continuously variable transmission 20 set by the operation of the low speed switch 111. However, when sufficient driving force cannot be ensured for the raising device 80 that needs to be operated at high speed, the output may be increased so that the vehicle speed in the lodging mode is higher than that in the extremely low speed mode. When using the lodging mode, since it is basically in a flat field, the traveling stability can be ensured without keeping the vehicle speed as low as in the extremely low speed mode.

[0167] The above-mentioned mowing lever 18 is operable at a cutting position for interrupting the transmission to the mowing device 3 and the threshing device 4, a threshing position for transmitting only to the threshing device 4, and a mowing position for transmitting to the mowing device 3 and the threshing device 4. A mowing sensor 18S for detecting the operating position of the mowing lever 18 is provided. When the mowing sensor 18S is in the threshing position and the low-speed switch 111 is operated to select the extremely low-speed mode, and the low-speed switch 111 is operated again, the output mode of the continuously variable transmission 20 is switched from the extremely low-speed mode to the moving speed mode.

[0168] When only transmitted to the threshing device 4, since it is not necessary to move the machine body forward for the mowing device 3 to mow the cereal straws, even with a high output enabling high-speed travel in the moving speed mode, only the threshing operation proceeds on the spot. For the threshing operation, there are many parts that require driving force, such as the swinging of the sorting shelf, the blowing of the winnowing basket, and the driving of the feed chain and the handling cylinder. Also, depending on the amount of cereal straws supplied and the state of the harvesting work environment, a higher driving force is required. When the output of the continuously variable transmission 20 is limited to a low level, the sorting accuracy of the grains may decrease, or the cereal straws (straw discharge) after the ear tips are cut may become clogged during conveyance, which may lead to a deterioration in the quality of the harvested product and an interruption of the work. However, if the continuously variable transmission 20 can be operated at a high output, this problem will not occur.

[0169] In addition, when the low-speed switch 111 is operated when in the extremely low-speed mode and the mowing lever 18 is operated to the mowing position, it is determined that the threshing operation is performed while advancing and mowing the cereal straws. The control device 100 is configured to switch the continuously variable transmission 20 to the working speed mode so that the traveling speed is not too fast to interfere with the mowing of the cereal straws.

[0170] As described above, it is possible to prevent the cereal straws exceeding the processing capacity of the mowing device 3 and the threshing device 4 from entering at one time, so that it is possible to prevent the occurrence of uncut cereal straws and the clogging of the cereal straws in the conveyance path.

[0171] In addition, after the output of the continuously variable transmission 20 switches to the working speed mode, the cutting clutch 22 and the threshing clutch 23 that turn on and off the transmission of the driving force to the cutting device 3 and the threshing device 4 are set to the on state, so that the driving force is transmitted to the cutting device 3 and the threshing device 4 during the increase in output and the traveling is started, and it is possible to prevent the work from starting before it becomes suitable for cutting, conveying, and threshing the cereal straws.

[0172] This prevents clogging of the cereal straws and occurrence of uncut residues.

[0173] Note that when the cutting and threshing lever 18 is operated to the cutting and threshing position, each time the sub-shift switch 17 is operated, the continuously variable transmission 20 may be configured to alternately switch between the working speed mode and the lodging mode.

[0174] In addition to this, in conjunction with the operation of the input shift solenoid 110b and the output shift solenoid 110a, the cutting and threshing shift motor 114 may also be operated to switch the transmission system of the pickup device 80 between the high-speed side and the low-speed side. As described above, it is possible to prevent the driving force from being transmitted to the pickup device 80 while the output of the continuously variable transmission 20 is changing.

[0175] This makes it possible to switch the machine body to a state where the harvesting work of the lodged cereal straws is performed only by operating the sub-shift switch 17 even when some of the cereal straws in the field are lodged, so that the operation becomes simple and the operability is improved.

[0176] Note that the above control configuration is performed only under the condition that the operating angle of the shift lever 16 is within a predetermined range where the neutral is 0 and plus or minus a predetermined angle, that is, in a range where the high output is not obtained. Note that the above conditions also include the state where the shift lever 16 is operated to the neutral.

[0177] When the switching operation between the working speed mode and the lodging mode is performed by operating the above-mentioned sub-shift switch 17, the monitor 11 displays the current mode, indicating that the switching has been reliably operated. The display switching of this monitor 11 is performed at the time when the sub-shift switch 17 is operated, and is made prior to the completion of the switching of the continuously variable transmission device 20 and the switching of the operating speed of the raising device 80 by the mowing and threshing speed motor 114.

[0178] As a result, the operator can confirm that the low-speed switch 111 or the sub-shift switch 17 has been operated, so that it is possible to prevent the work from being interrupted without noticing that the operation cannot be performed and wasting time. In addition, it becomes easier to notice that a malfunction has occurred, so that the time of traveling in the extremely low speed mode can be shortened, and a decrease in work efficiency can be suppressed.

Explanation of Signs

[0179] 2 Traveling device 3 Mowing device 4 Threshing device 50L Left mowing side cover (side cover) 50R Right mowing side cover (side cover) 53L Upper left mowing cover (upper mowing cover) 53R Upper right mowing cover (upper mowing cover) 54L Lower left mowing cover (lower mowing cover) 54R Lower right mowing cover (lower mowing cover) 55L Connecting convex part 55R Connecting convex part 55La Outer wall 55Ra Outer wall 55Lb Front wall 55Rb Front wall 55Lc Rear wall 55Rc Rear wall 55Ld Lower wall 55Rd Lower wall 55Lz First mounting hole 55Rz First mounting hole 56L Connecting concave part 56R Connecting concave part 57L Lower rib 57R Lower rib 58L Upper rib 58R Upper rib 58Lz Second mounting hole 58Rz Second mounting hole 59Lb Front wall 59Rb Front wall 59Lc Rear wall 55Rc Rear wall 59Ld Lower wall 59Rd Lower wall 60L Upper mounting rib 60R Upper mounting rib 61L Lower mounting rib 61R Lower holding rib

Claims

【Claim 1】 In a harvester provided with a cutting device (3) on the front side of the machine body that travels with a traveling device (2) and a threshing device (4) that separates grains from the cereal straw cut by the cutting device (3), side covers (50L, 50R) are respectively provided on the left and right sides of the cutting device (3), and the left and right side covers (50L, 50R) are each composed of left and right upper cutting covers (53L, 53R) and left and right lower cutting covers (54L, 54R), connecting convex portions (55L, 55R) formed to protrude from the lower portions of the left and right upper cutting covers (53L, 53R) are inserted into and connected to connecting concave portions (56L, 56R) formed by recessing the upper portions of the left and right lower cutting covers (54L, 54R), a plurality of lower ribs (57L, 57R) are provided at intervals in the front-rear direction on the outer side walls (55La, 55Ra) on the outer side of the machine body of the connecting convex portions (55L, 55R), a plurality of lower holding ribs (61L, 61R) are provided at intervals in the front-rear direction on the lower surface side of the lower walls (59Lb, 59Rb) of the connecting concave portions (56L, 56R), A harvester configured such that when the upper cutting cover (53L, 53R) and the lower cutting cover (54L, 54R) are connected to form a side cover (50L, 50R), the lower ribs (57L, 57R) and the lower holding ribs (61L, 61R) are arranged at positions where the front and rear coincide.

Images