combine

Abstract

To provide a combine capable of preventing such a situation in which, harvested objects spill from a discharge auger even when a machine body is operated to move forward / backward, in discharge work, for achieving proper discharge work, for solving problems for example, when lowering a reaping device, actuating the discharge auger for discharging to outside of the machine, grains, namely in discharge work time, some combines inhibit travel of the machine body, however, in normal discharge work time, the reaping device is moved upward, when actuating the discharge auger and discharging the grains to outside of the machine body, the machine body can be operated to move forward / backward freely, therefore grains spill from the discharge auger.SOLUTION: There is provided a combine comprising: a discharge auger 8 for discharging to outside of a machine body, harvested objects in a grain tank 7, the combine is configured so that, in discharge work for actuating the discharge auger 8 for discharging the harvested objects in the grain tank 7 to outside of the machine body, if the machine body is operated to move forward / backward, a control unit stops actuation of the discharge auger 8.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a combine harvester equipped with a discharge auger that discharges harvested material from a grain tank outside the combine harvester. [Background technology]

[0002] A known combine harvester has a harvesting device for harvesting stalks at the front of the body frame, a thresher for threshing and sorting the stalks harvested by the harvesting device at the rear of the harvesting device, a control section where an operator sits, a grain tank for storing the threshed and sorted grain, and a discharge auger for discharging the grain in the grain tank outside the machine (see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-165778 Summary of the Invention [Problem to be solved by the invention]

[0004] In conventional combine harvesters, the machine is prohibited from moving during the discharge operation, in which the reaping device is lowered and the discharge auger is operated to discharge grain outside the machine. However, because the reaping device is raised during normal discharge operation, the machine can be freely operated forward or backward while the discharge auger is operating to discharge grain outside the machine, which can cause grain to spill from the discharge auger.

[0005] The present invention has been made in consideration of the above, and aims to provide a combine harvester that can perform proper discharge operations by preventing the harvested products from spilling from the discharge auger even when the machine body is operated forward or backward during discharge operations. [Means for solving the problem]

[0006] The first aspect of the present invention is A combine harvester is provided with a reaping device (3) at the front of a machine frame (1), a threshing device (4), a control section (5), and a grain tank (7) for storing harvested material at the rear of the reaping device (3), and a discharge auger (8) for discharging the harvested material in the grain tank (7) outside the machine. When the machine is operated to move forward or backward during the discharge operation of operating the discharge auger (8) to discharge the harvested crops in the grain tank (7) outside the machine, the machine accelerates forward or backward more slowly than usual, If the parking brake pedal (15) is depressed during the discharge operation, the operation of the discharge auger (8) will not be stopped even if the machine is operated to move forward or backward, and if the parking brake pedal (15) is released from this state, the operation of the discharge auger (8) will be stopped and the machine will remain restricted from moving forward or backward. This is a combine harvester characterized by the above.

[0008] No. 2 The present invention is The method is characterized in that after the control device (65) stops the operation of the discharge auger (8) by operating the machine forward or backward during the discharge work, the operation of the discharge auger (8) remains stopped even if the machine is stopped. 1 of This is a combine harvester of the present invention.

[0009] No. 3 The present invention is The first feature is that after the control device (65) stops the operation of the discharge auger (8) by moving the machine forward or backward during the discharge work, the operation of the discharge auger (8) is restricted unless the machine is stopped. or second This is the combine of the present invention.

[0010] No. 4 The present invention is When the discharge auger (8) is moved from the storage position to the discharge operation position, the control device (65) sets the sub-transmission device to a medium speed or a low speed even if the mode select operation device (13E) is set to a road travel mode. or second This is the combine of the present invention. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a plan view of a combine harvester according to an embodiment of the present invention. [Figure 2]1 is a left side view of a combine harvester according to an embodiment of the present invention. FIG. [Figure 3] 1 is a partial front view of a combine harvester according to an embodiment of the present invention. [Figure 4] 1 is a longitudinal cross-sectional view of a transmission of a combine harvester according to an embodiment of the present invention, taken in the left-right direction. [Figure 5] 1 is an explanatory diagram of a brake device of a transmission of a combine harvester according to an embodiment of the present invention. FIG. [Figure 6] 1 is a side view of a brake pedal assembly of a combine harvester according to an embodiment of the present invention. FIG. [Figure 7] FIG. 2 is an enlarged side view of a brake pedal assembly of the combine harvester according to the embodiment of the present invention. [Figure 8] FIG. 2 is an enlarged plan view of a brake pedal assembly of the combine harvester according to the embodiment of the present invention. [Figure 9] FIG. 2 is an enlarged front view of a brake pedal assembly of the combine harvester according to the embodiment of the present invention. [Figure 10] 1 is a connection diagram of a control device for a combine harvester according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] A combine harvester according to an embodiment of the present invention will be described below with reference to the accompanying drawings. For ease of understanding, the directions are described as follows: front, rear, right, and left, as viewed from the operator's perspective; however, the configuration is not limited to these directions.

[0013] The combine harvester is provided with left and right traveling devices 2 consisting of a pair of left and right crawlers that travel on the soil surface on the underside of the machine frame 1, and a reaping device 3 that harvests stalks in the field is provided on the front side of the machine frame 1. In addition, a threshing device 4 that threshes and sorts the stalks harvested by the reaping device 3 is provided on the rear left side of the reaping device 3, and a control unit 5 on which an operator sits is provided on the rear right side of the reaping device 3.

[0014] An engine room 6 for mounting an engine is provided below the control unit 5, and a grain tank 7 for storing the harvested grain that has been threshed and sorted by the threshing device 4 is provided behind the control unit 5. The grain stored in the grain tank 7 is discharged to the outside by a discharge auger 8 connected to the grain tank 7.

[0015] A pilot's seat 11 where the pilot sits is provided at the rear of the control unit 5, a front panel 12 is provided in front of the pilot's seat 11, and a side panel 13 is provided on the left side of the pilot's seat 11. In addition, a floor 14 where the pilot gets on and off is provided below between the pilot's seat 11 and the front panel 12, and a parking brake pedal 15 that stops the traveling of the traveling device 2 is provided at the front left of the floor 14.

[0016] A monitor 12A that displays the traveling speed of the traveling device 2, etc., is provided on the left side of the front panel 12, and an operating lever 12B that controls the rotation of the traveling device 2 and the raising and lowering of the reaping device 3 is provided on the right side.

[0017] An emergency stop switch 12C for stopping the engine is provided at the top between the monitor 12A and the operation lever 12B, and an automatic brake switch 12D for stopping the traveling of the traveling device 2 is provided at the bottom.

[0018] A main speed change lever (HST lever) 13A is provided on the front left of the side panel 13 to operate the hydraulic continuously variable transmission 30, which increases / decreases the rotational speed output from the engine and switches the rotational direction, and a sub-speed change lever 13B is provided behind the main speed change lever 13A to operate the transmission 31, which increases / decreases the rotational speed output from the hydraulic continuously variable transmission 30.

[0019] On the left side of the main speed change lever 13A is a manual lever 13C which switches to ridge cutting work in which an assistant worker places the cut stalks on the conveying device 3A at the rear of the cutting device 3 and threshes them, and behind the sub-speed change lever 13B is a harvest discharge lever 13D which discharges the grain stored in the grain tank 7 to the outside using the discharge auger 8.

[0020] When the main speed change lever 13A is in the neutral position, the rotational speed output from the hydraulic continuously variable transmission 30 is zero. When the main speed change lever 13A is in the forward tilt position, the rotational direction output from the hydraulic continuously variable transmission 30 is forward, which is the same as the rotational direction transmitted from the engine. As the tilt angle of the front tilt position increases, the rotational speed output from the hydraulic continuously variable transmission 30 increases, and as the tilt angle of the front tilt position decreases, the rotational speed output from the hydraulic continuously variable transmission 30 decreases. When the main speed change lever 13A is in the rear tilt position, the rotational direction output from the hydraulic continuously variable transmission 30 is reverse to the rotational direction transmitted from the engine. As the tilt angle of the rear tilt position increases, the rotational speed output from the hydraulic continuously variable transmission 30 increases, and as the tilt angle of the rear tilt position decreases, the rotational speed output from the hydraulic continuously variable transmission 30 decreases. The attitude of the main speed change lever 13A is detected by a main speed change sensor 23A, such as a potentiometer, attached to the lower part of the main speed change lever 13A.

[0021] When the sub-speed change lever 13B is tilted to the low speed position, the rotation speed transmitted from the hydraulic continuously variable transmission 30 is reduced by the transmission 31 and transmitted to the traveling device 2, when tilted to the medium speed position, the rotation speed transmitted from the hydraulic continuously variable transmission 30 is transmitted to the traveling device 2 without being increased or decreased, and when tilted to the high speed position, the rotation speed transmitted from the hydraulic continuously variable transmission 30 is increased and transmitted to the traveling device 2. The position of the sub-speed change lever 13B is detected by an sub-speed change sensor 23B such as a potentiometer attached to the lower part of the sub-speed change lever 13B.

[0022] When the hand-handling lever 13C is tilted forward, the lifting device of the reaping device 3 and other devices are driven, and the reaping device enters normal reaping and threshing mode. When the hand-handling lever 13C is tilted backward, the lifting device and other devices are stopped, and the reaping device enters manual reaping mode, in which an assistant worker threshes the reaped stalks while placing them on the transport device 3A of the reaping device 3. The position of the hand-handling lever 13C is detected by a hand-handling sensor 23C, such as a potentiometer, attached to the bottom of the hand-handling lever 13C. The hand-handling sensor 23C is ON in manual reaping mode and OFF in normal reaping and threshing mode.

[0023] When the harvest discharge lever 13D is tilted forward, the system enters a harvest discharge mode in which the grain stored in the grain tank 7 is discharged by the discharge auger 8 to a storage tank or the like of an external harvest transport vehicle (a truck with a storage tank mounted on the loading platform), and when the harvest discharge lever 13D is tilted backward, the conveying spiral in the discharge auger 8 stops and the system enters a harvest non-discharge mode. The position of the harvest discharge lever 13D is detected by a discharge sensor 23D such as a potentiometer attached to the bottom of the harvest discharge lever 13D, and the discharge sensor 23D is ON in the harvest discharge mode and OFF in the harvest non-discharge mode.

[0024] The upper end of the grip of the harvest product discharge lever 13D is provided with a left-right rotation switch, a up-down movement switch, and an extension switch. By operating the left-right rotation switch, the discharge auger 8 can be rotated in the directions of arrows (A) and (B) around the base as the rotation center, by operating the up-down movement switch, the discharge outlet at the tip can be moved up and down around the base as the rotation center, and by operating the extension switch, the discharge auger 8 can be extended and retracted in the directions of arrows (C) and (D).

[0025] The transmission 31 is provided with a first speed-change shaft 32, a second speed-change shaft 33, left and right counter shafts 34A, 34B, and left and right output shafts 35A, 35B, which extend in the left-right direction from the upstream side to the downstream side of the transmission.

[0026] A gear of a different diameter that can move left and right is fitted to the outside of the first speed-change shaft 32, and a gear of a different diameter is provided on the second speed-change shaft 33. As a result, by operating the sub-speed-change lever 13B to move the gear fitted to the first speed-change shaft 32 left and right, the rotation speed transmitted from the hydraulic continuously variable transmission 30 to the first speed-change shaft 32 can be increased or decreased and then transmitted to the second speed-change shaft 33.

[0027] Left and right sleeves 36A, 36B that can move laterally are fitted onto both sides of the left and right countershafts 34A, 34B, respectively. Furthermore, left and right brake devices 37A, 37B equipped with a number of brake pads are provided on both ends of the left and right countershafts 34A, 34B, respectively. When the operating lever 12B is tilted to the left, the left sleeve 36A fitted onto the left countershaft 34A moves leftward, disengaging the left countershaft 34A from a gear fitted onto the left countershaft 34A at a position opposite to a gear provided on the left output shaft 35A, thereby interrupting the transmission of rotational speed from the left countershaft 34A to the left output shaft 35A. Furthermore, the brake pads move leftward and come into contact with the brake disc, activating the left brake device 37A and stopping the rotation of the left output shaft 35A. The left sleeve 36A is connected to the upper part of a left first plate 40A that extends in the vertical direction and is attached to the front wall of the transmission 31 via a left shifter 38A that extends in the vertical direction.

[0028] When the operating lever 12B is tilted to the right, the right sleeve 36B fitted onto the right countershaft 34B moves rightward, disengaging the right countershaft 34B from a gear fitted onto the right countershaft 34B at a position facing the gear provided on the right output shaft 35B, thereby interrupting the transmission of rotational speed from the right countershaft 34B to the right output shaft 35B. In addition, the brake pad moves rightward and comes into contact with the brake disc, activating the right brake device 37B to stop the rotation of the right output shaft 35B. The right sleeve 36B is connected to an upper portion of a right first plate 40B extending vertically that is attached to the front wall of the transmission 31, via a right shifter 38B extending vertically.

[0029] When the parking brake pedal 15 is depressed, the left sleeve 36A of the left countershaft 34A moves leftward, interrupting the transmission of rotational speed from the left countershaft 34A to the left output shaft 35A and stopping the rotation of the left output shaft 35A. At the same time, the right sleeve 36B of the right countershaft 34B moves rightward, interrupting the transmission of rotational speed from the right countershaft 34B to the right output shaft 35B and stopping the rotation of the right output shaft 35B.

[0030] The lower part of the left first plate 40A is connected to the left part of the left second plate 41A, which extends in the upper right direction and is connected to the operating lever 12B, and to the upper part of the left third plate 42A, which extends in the up-down direction, via a wire cable (not shown). The lower part of the left first plate 40A, the left part of the left second plate 41A, and the upper part of the left third plate 42A are rotatably supported on a left support shaft 43A, which extends in the front-to-rear direction. Here, the left first plate 40A, the left second plate 41A, and the left third plate 42A are collectively referred to as the left rotating plate 45A. As a result, when the operating lever 12B is tilted leftward, the left rotating plate 45A rotates clockwise when viewed from the axis of the left support shaft 43A, and the left sleeve 36A can be moved leftward along the left counter shaft 34A via the left shifter 38A.

[0031] The lower part of the right first plate 40B is connected to the right part of the right second plate 41B, which extends in an upper left direction and is connected to the operating lever 12B, and to the upper part of the right third plate 42B, which extends in the up-down direction, via a wire cable (not shown). The lower part of the right first plate 40B, the right part of the right second plate 41B, and the upper part of the right third plate 42B are rotatably supported on a right support shaft 43B, which extends in the front-rear direction. Here, the right first plate 40B, the right second plate 41B, and the right third plate 42B are collectively referred to as the right rotating plate 45B. As a result, when the operating lever 12B is tilted to the right, the right rotating plate 45B rotates counterclockwise when viewed from the axis of the right support shaft 43B, and the right sleeve 36B can be moved to the right along the right countershaft 34B via the right shifter 38B.

[0032] A support shaft 50 extending in the front-rear direction is provided below and between the left support shaft 43A and the right support shaft 43B in the left-right direction. The center of a swing plate 51 extending in the up-down direction is rotatable on the support shaft 50.

[0033] A pin 52A extending in the front-rear direction is provided on the upper part of the swing plate 51, and a pin 52B extending in the front-rear direction is provided on the lower part of the swing plate 51. The pin 52A is connected to the parking brake pedal 15 via a brake pedal rod 53. The pin 52B is inserted into an elongated hole 58 formed in the right end of a plate-shaped rod 54 extending in the left-right direction and extending in the longitudinal direction of the rod 54.

[0034] When viewed from the front, the right part of arm 55A extending in a downward and left direction is fixed to the vertical middle part between support shaft 50 and pin 52A on oscillating plate 51, and the left part of arm 55B extending in an upward and downward direction is fixed to the vertical middle part between support shaft 50 and pin 52B.

[0035] An elongated hole 56A is formed in the right part of the arm 55A along the longitudinal direction of the arm 55A, and an elongated hole 56B is formed in the left part of the arm 55B along the longitudinal direction of the arm 55B.

[0036] A left pin 57A extending in the front-to-back direction is inserted into the long hole 56A on the front surface of the left third plate 42A that forms the left rotating plate 45A, and a right pin 57B extending in the front-to-back direction is inserted into the long hole 56B on the front surface of the right third plate 42B that forms the right rotating plate 45B.

[0037] As a result, when the parking brake pedal 15 is depressed, the swing plate 51 rotates counterclockwise when viewed from the axis of the support shaft 50, and the left rotating plate 45A rotates clockwise when viewed from the axis of the left support shaft 43A via the arm 55A and the left pin 57A, and the left sleeve 36A can be moved to the left along the left counter shaft 34A via the left shifter 38A. Also, the right rotating plate 45B rotates counterclockwise when viewed from the axis of the right support shaft 43B via the arm 55B and the right pin 57B, and the right sleeve 36B can be moved to the right along the right counter shaft 34B via the right shifter 38B.

[0038] An auxiliary device 60 formed of an electric motor or the like that assists in depressing the parking brake pedal 15 is provided at the left end of the rod 54. When the driver depresses the parking brake pedal 15 (when the potentiometer 25, which is a sensor described below, outputs ON), a rotary shaft 61 of the auxiliary device 60 rotates clockwise, moving the rod 54 to the left via a crank plate 62. As a result, the auxiliary device 60 operates in accordance with the driver's depressing of the parking brake pedal 15, and rotates the swing plate 51 counterclockwise when viewed from the axis of the support shaft 50 via the rod 54 and the elongated hole 58, thereby assisting the driver in depressing the parking brake pedal 15 and enabling the driver to easily depress the parking brake pedal 15.

[0039] The left end of the rod 54 and the crank plate 62 can also be connected via an elastic member such as a spring, which makes it easy to adjust the length of the rod 54. Also, instead of the rod 54, the pin 52B and the crank plate 62 can be connected by a wire cable.

[0040] The auxiliary device 60 can be activated in synchronization with the driver's depression of the parking brake pedal 15, or with a predetermined delay from the driver's depression of the parking brake pedal 15. The state of depression of the parking brake pedal 15 by the driver is detected by a potentiometer 25, which will be described in detail later. The potentiometer 25 detects that the parking brake pedal 15 is depressed deeper than the play area A1 until the left and right brake devices 37A, 37B start to operate after the parking brake pedal 15 is depressed, and outputs an ON signal to the control device 65. When the parking brake pedal 15 is not depressed or is within the play area A1, the potentiometer 25 outputs an OFF signal.

[0041] When the driver depresses the parking brake pedal 15 again to release the depressed state of the parking brake pedal 15 (when the potentiometer 25 changes from ON output to OFF output), the rotary shaft 61 of the auxiliary device 60 rotates counterclockwise to move the rod 54 to the right via the crank plate 62. Note that when the parking brake pedal 15 is depressed to the fullest extent, its locking hook 15a automatically engages with a locking pin on the machine body to maintain the depressed state, and when the parking brake pedal 15 is depressed again, the locking hook 15a disengages from the locking pin to release the hold.

[0042] When the automatic brake switch 12D on the front panel 12 is operated and outputs an ON signal, regardless of the depression state of the parking brake pedal 15, for example, when the harvest discharge lever 13D is operated to the rice discharge position and the discharge sensor 23D outputs an ON signal, the auxiliary device 60 is activated, causing the rotating shaft 61 to rotate clockwise and moving the rod 54 to the left via the crank plate 62. As a result, the swing plate 51 rotates counterclockwise when viewed from the axis of the support shaft 50. This causes the left rotating plate 45A to rotate clockwise when viewed from the axis of the left support shaft 43A via the arm 55A and left pin 57A, and moves the left sleeve 36A to the left along the left counter shaft 34A via the left shifter 38A. Similarly, the right rotating plate 45B to rotate counterclockwise when viewed from the axis of the right support shaft 43B via the arm 55B and right pin 57B, and moves the right sleeve 36B to the right along the right counter shaft 34B via the right shifter 38B.

[0043] Furthermore, when the harvest discharge lever 13D is operated from the rice discharge position to the normal position, the discharge sensor 23D is turned OFF, and the main speed change sensor 23A detects that the main speed change lever 13A is operated to the neutral position, the auxiliary device 60 is activated, causing the rotary shaft 61 to rotate counterclockwise and moving the rod 54 to the right via the crank plate 62. This prevents the traveling device 2 from suddenly moving forward or backward when the auxiliary device 60 releases the operation of the left and right brake devices 37A, 37B.

[0044] In addition, a working unit output shaft is provided upstream of the point where the transmission 31 cuts off the drive to the left and right traveling devices 2, and transmits drive force to the reaping device 3 and the threshing device 4.

[0045] Next, the detailed configuration of the parking brake pedal 15 will be described.

[0046] The parking brake pedal 15 has a pivot shaft 70 welded to the base and rotatably supported on a cylindrical boss 72 welded to one rising side surface 71a of a U-shaped stay 71 when viewed from the front, so that it can be freely stepped on and rotated.

[0047] The cylindrical boss 72 is provided so as to protrude outward from one rising side surface 71a of the stay 71, and the parking brake pedal 15 is provided at the protruding end.

[0048] Therefore, by lengthening the cylindrical boss 72, the pivot shaft 70 can also be configured to be long, and the parking brake pedal 15 can be rotatably supported with little backlash. Furthermore, if a cabin is provided in the control unit 5, for example, the cylindrical boss 72 that protrudes outward can be used as a part that penetrates the cabin wall, and the parking brake pedal 15 can be positioned inside the cabin, while the stay 71 to which other members are attached can be positioned outside the cabin, thereby improving the airtightness of the cabin.

[0049] A pivot shaft 70 is provided between one side surface 71a and the other side surface 71b of a stay 71 that is U-shaped when viewed from the front, and a pivot arm 73 is fixed at its midpoint to the pivot shaft 70.

[0050] An operating piece 73c is welded and fixed to the tip of the pedal side arm portion 73a extending to one side of the pivot arm 73, and a starting safety switch 74 is fixed with a screw to one rising side surface 71a of the stay 71 at a position opposite the operating piece 73c.

[0051] When the parking brake pedal 15 is fully depressed, the operating piece 73c at the tip of the pedal side arm portion 73a presses the switch piece 74a of the start safety switch 74, the engine start circuit is connected, and when the engine switch is turned to start, the engine starts.

[0052] A pin 75a is welded and fixed to the top of a regulating piece 71c formed by bending a portion of the upper part of one rising side surface 71a of the stay 71 inward at a right angle, and a pin 75b is welded and fixed to the tip of the pedal side arm portion 73a, and a tension spring 76, which is a return spring that urges the parking brake pedal 15 upward, is provided between both pins 75a and 75b.

[0053] The lower surface of the regulating piece 71c comes into contact with the upper surface of the tip of the pedal side arm portion 73a, thereby regulating the upward movement position of the parking brake pedal 15.

[0054] An engagement pin 77 is provided at the tip of the connecting arm portion 73b extending to the other side of the rotating arm 73, and the engagement pin 77 and a pin 52A provided on the upper part of the swing plate 51 of the transmission 31 are connected by the brake pedal rod 53.

[0055] Therefore, when the parking brake pedal 15 is depressed, the left and right brake devices 37A, 37B of the transmission 31 are actuated via the rotary arm 73 and the brake pedal rod 53 as described above, and the drive to the left and right traveling devices 2 is cut off.

[0056] The potentiometer 25 for detecting the amount of depression of the parking brake pedal 15 is fixed to the other side surface 70b of the rising portion of the stay 71 with a screw, as described above.

[0057] The detection gear 25a of the potentiometer 25 engages with a sector gear 79 fixed to the tip of an operating shaft 78 whose base is welded to the connecting arm portion 73b of the rotating arm 73 and which extends toward the detection gear 25a, and rotates forward and backward according to the amount of rotation of the rotating arm 73, so that the potentiometer 25 detects the amount of rotation of the rotating arm 73 and detects the operating position of the parking brake pedal 15 when it is depressed.

[0058] Two through holes 71e are formed in series in the bottom surface 71d of the stay 71. The stay 71 is fixed to the floor 14 by passing bolts 80, which serve as fasteners, through the two through holes 71e from above. The two through holes 71e are larger than the bolts 80, allowing the mounting position and angle of the parking brake pedal 15 to be adjusted.

[0059] Therefore, the parking brake pedal 15, the pivot arm 73, the tension spring 76 which is a return spring, the regulating piece 71c which regulates the upward movement position of the parking brake pedal 15, the start safety switch 74, the potentiometer 25 and the brake pedal rod 53 are provided on the stay 71 to form a single brake pedal assembly 81, so that when manufacturing or maintaining the combine harvester, all that is needed to do is to insert the bolts 80 into the two through holes 71e of the stay 71 and fasten the brake pedal assembly 81 to the floor 14 from above, thereby enabling all the parts related to the parking brake pedal 15 to be attached together, thereby improving the efficiency of the assembly work and workability.

[0060] In addition, after the brake pedal assembly 81 is fixed to the floor 14, the engagement hole 53a at the tip of the brake pedal rod 53 is connected to the pin 52A provided on the upper part of the swing plate 51 of the transmission 31. When the parking brake pedal 15 is depressed, the left and right brake devices 37A, 37B of the transmission 31 are activated via the pivot arm 73 and the brake pedal rod 53 as described above, and the drive to the left and right traveling devices 2 is cut off.

[0061] Furthermore, since the positions of the starting safety switch 74 and the potentiometer 25 can be adjusted when assembling the brake pedal assembly 81, this can be done efficiently and with good workability on a workbench, for example.

[0062] Next, the parking brake pedal 15 also has the function of a conventional brake pedal, which will be described in detail below.

[0063] First, the side panel 13 is provided with a mode select lever 13E as a mode selector operating device for switching between a standard field work mode, a field lodging work mode, and a road travel mode.

[0064] When the mode selector lever 13E is set to the standard field work mode, the mode selector lever sensor 82 located at the base of the mode selector lever 13E outputs an ON signal to the control device 65 indicating that the mode is standard field work mode, the sub-speed change lever 13B is set to the medium speed position by the sub-speed change actuator 85 such as an electric cylinder, various work controls such as automatic mowing direction control, mowing height control and threshing depth control are activated, and the monitor 12A displays "standard field work mode."

[0065] When the mode selector lever 13E is set to the field lodging operation mode, the mode selector lever sensor 82 located at the base of the mode selector lever 13E outputs an ON signal to the control device 65 indicating that the field lodging operation mode is active, the sub-speed change lever 13B is set to the low-speed position by the sub-speed changeover actuator 85, various operation controls such as automatic mowing direction control, mowing height control and threshing depth control are activated, and the message "field lodging operation mode" is displayed on the monitor 12A.

[0066] When the mode selector lever 13E is set to the road driving mode, the mode selector lever sensor 82 provided at the base of the mode selector lever 13E outputs an OFF signal to the control device 65, indicating the road driving mode, the sub-speed change lever 13B is set to the high-speed position by the sub-speed changeover actuator 85, various operation controls such as automatic mowing direction control, mowing height control, and threshing depth control are stopped, and the monitor 12A displays "road driving mode."

[0067] The parking brake pedal 15 functions as a conventional raking pedal only when the mode selector lever 13E is set to the field work mode or field lodging work mode and the mode selector lever sensor 82 outputs an ON signal to the control device 65.

[0068] That is, the potentiometer 25 detects the brake application region A2 where the parking brake pedal 15 is depressed beyond the play region A1, the left and right brake devices 37A, 37B are activated, and drive to the left and right traveling devices 2 is cut off, and outputs the brake application region A2 to the control device 65. The A3 region is a half-brake and half-clutch region.

[0069] When the parking brake pedal 15 is in the brake application range A2 (when the potentiometer 25 outputs that the brake application range A2), if the main speed change lever 13A is operated forward (when the main speed change sensor 23A detects operation of the main speed change lever 13A forward), current is applied to the forward solenoid of the hydraulic continuously variable transmission 30 according to the amount of forward operation of the main speed change lever 13A, driving the reaping device 3 and the threshing device 4, allowing on-the-spot reaping work to be performed with the machine stopped. At this time, because the parking brake pedal 15 is in the brake application range A2, drive to the left and right traveling devices 2 is cut off and the brakes are applied, and the combine harvester is stopped and not moving forward.

[0070] Furthermore, even if the main shift lever 13A is operated to the reverse side when the parking brake pedal 15 is in the brake application range A2 (the main shift sensor 23A detects that the main shift lever 13A is operated to the reverse side), no current is applied to the forward solenoid or reverse solenoid of the hydraulic continuously variable transmission 30, and the reaping device 3 and threshing device 4 are not driven.

[0071] In addition, the input side of the control device 65 is connected via a predetermined input interface circuit to an emergency stop switch 12C that stops the engine drive in an emergency, an automatic brake switch 12D that automatically activates the auxiliary device, a main speed change sensor 23A that detects the position of the main speed change lever 13A, a sub-speed change sensor 23B that detects the position of the sub-speed change lever 13B, a manual handling sensor 23C that detects the position of the manual handling lever 13C, a discharge sensor 23D that detects the position of the harvest discharge lever 13D, a potentiometer 25 that detects the depression state of the parking brake pedal 15, a start safety switch 74, and a mode select lever sensor 82.

[0072] The output side of the control device 65 is connected to the monitor 12A, the auxiliary device 60, the engine starting circuit, and the forward solenoid and reverse solenoid of the hydraulic continuously variable transmission 30 via a predetermined output interface circuit.

[0073] Next, this embodiment is characterized by the discharge operation in which the harvested product discharge lever 13D is operated to discharge grains stored in the grain tank 7 to the outside by the discharge auger 8, which will be described in detail below.

[0074] When the grain tank 7 becomes full during harvesting operations with the combine, the worker temporarily stops the harvesting operation, moves the combine to the side of a harvest transport vehicle (a truck equipped with a storage tank on the loading platform) waiting on the side of a paddy field or road, and stops the machine by shifting the main shift lever 13A to the neutral position.

[0075] Then, by operating the left / right rotation switch, up / down movement switch and telescopic switch at the upper end of the gripping portion of the harvest discharge lever 13D, the discharge outlet at the tip of the discharge auger 8 is aligned with the opening at the top of the storage tank of the harvest transport vehicle, and the harvest discharge lever 13D is operated to a forward tilt position to drive the conveying spiral inside the discharge auger 8, causing the discharge auger 8 to discharge the grain stored in the grain tank 7 into the storage tank of the harvest transport vehicle.

[0076] At this time, the control device 65 receives an input signal from the main speed change sensor 23A indicating that the main speed change lever 13A is in a neutral position, and also receives an input signal from the discharge sensor 23D indicating that the harvest discharge lever 13D is in a forward tilted position in the harvest discharge mode.

[0077] If the main speed change lever 13A is accidentally operated from the neutral position to the forward tilt position or the rear tilt position during discharge work (for example, if the operator's body accidentally touches the main speed change lever 13A and operates it, or if the operator operates it incorrectly due to mistaken operation), or if the main speed change lever 13A is intentionally operated from the neutral position to the forward tilt position or the rear tilt position, the control device 65 receives an input signal from the main speed change sensor 23A indicating that the main speed change lever 13A has entered the forward tilt position or the rear tilt position, and activates a discharge lever switching actuator 90 such as an electric cylinder that switches the harvest discharge lever 13D to the rear tilt position and non-harvest discharge mode, thereby switching the harvest discharge lever 13D to the rear tilt position and non-harvest discharge mode.

[0078] Therefore, even if the main speed change lever 13A is operated from the neutral position to the forward tilt position or the rearward tilt position during the discharge operation, the discharge auger 8 stops discharging grains, preventing the grains from spilling.

[0079] When the main speed change lever 13A is operated from the neutral position to a forward tilt position or a rear tilt position during the discharge operation, the control device 65 activates the discharge lever switching actuator 90, which switches the harvest discharge lever 13D to a rear tilt position and non-harvest discharge mode, and after switching the harvest discharge lever 13D to the rear tilt position and non-harvest discharge mode, energizes the forward solenoid or reverse solenoid of the hydraulic continuously variable transmission 30 by operating the main speed change lever 13A on the forward or reverse side, thereby moving forward or backward.

[0080] At that time, it is safe if the control device 65 energizes the forward solenoid or reverse solenoid of the hydraulic continuously variable transmission 30 to control the forward or reverse acceleration curve to be gentler than normal, so that the vehicle accelerates gradually.

[0081] Furthermore, when the main speed change lever 13A is operated from the neutral position to a forward tilt position or a rear tilt position during discharge work, the control device 65 receives an input signal from the main speed change sensor 23A indicating that the main speed change lever 13A has entered the forward tilt position or the rear tilt position, and energizes the forward solenoid or reverse solenoid of the hydraulic continuously variable transmission 30 by an amount equivalent to 50% of the forward operation amount or reverse operation amount of the main speed change lever 13A, causing the vehicle to move forward or reverse at a speed that is 50% of the forward operation amount or reverse operation amount of the main speed change lever 13A. Note that the reduction ratio for the forward operation amount or reverse operation amount of the main speed change lever 13A is not limited to 50% and may be set to a speed of a predetermined percentage depending on the model and other conditions.

[0082] Therefore, even if the main speed change lever 13A is operated from the neutral position to the forward tilt position or the rearward tilt position during discharge work, the vehicle moves forward or backward at a speed slower than the forward operation amount or the rearward operation amount, so that the discharge auger 8 can be prevented from coming into contact with other objects and being damaged, and safety is ensured.

[0083] Furthermore, when the left / right rotation switch, up / down movement switch and / or telescopic switch are operated to move the discharge auger 8 from the storage position to the discharge action position, even if the mode selector lever 13E is set to the road driving mode, the control device 65 sets the sub-speed change lever 13B to the medium speed position using the sub-speed changeover actuator 85, and moves forward or backward at the working speed, so that the discharge auger 8 can be prevented from coming into contact with other objects and being damaged, and safety is ensured.

[0084] Furthermore, when the left / right rotation switch, the up / down movement switch and / or the telescopic switch are operated to move the discharge auger 8 from the storage position to the discharge action position, even if the mode select lever 13E is set to the road traveling mode, the control device 65 can set the sub-speed change lever 13B to the low speed position using the sub-speed changeover actuator 85, thereby making the vehicle move forward or backward at a slower tilting speed, thereby providing even greater safety.

[0085] When moving with the discharge auger 8 moved from the storage position to the discharge action position, the control device 65 sounds the alarm buzzers in the control section 5 and the rear of the machine to alert the operator and people in the vicinity (an audio alarm or an alarm lamp other than the alarm buzzer may also be used to alert). When moving backward, the reverse buzzer is sounded first.

[0086] When the control device 65 switches the discharge auger 8 to the harvest non-discharge mode, the monitor 12A of the control unit 5 displays an image saying "Discharge has been stopped."

[0087] When the main speed change lever 13A is operated from the neutral position to the forward tilt position or the rear tilt position during the above-mentioned discharge operation, the control device 65 operates the discharge lever switching actuator 90 to switch the harvest discharge lever 13D to the rear tilt position and non-harvest discharge mode.After that, even if the main speed change lever 13A is returned to the neutral position and the machine is stopped, the discharge auger 8 will not enter the harvest discharge mode, and the harvest discharge lever 13D must be operated to the forward tilt position again to enter the harvest discharge mode.

[0088] Furthermore, when the main speed change lever 13A is operated from the neutral position to a forward tilt position or a rear tilt position during the above-mentioned discharge operation, the control device 65 activates the discharge lever switching actuator 90 to switch the harvest discharge lever 13D to a rear tilt position and non-harvest discharge mode.After this, if the main speed change lever 13A is in any position other than the neutral position, the control device 65 restricts the harvest discharge lever 13D from being set to a forward tilt position and into the harvest discharge mode.

[0089] Furthermore, if the parking brake pedal 15 is depressed during the discharge operation (the potentiometer 25 detects that the parking brake pedal 15 is depressed deeper than the play area A1 until the left and right brake devices 37A, 37B begin to operate and outputs an ON signal to the control device 65), even if the main speed change lever 13A is operated from the neutral position to the forward tilt position or the rearward tilt position, the control device 65 will not operate the discharge lever switching actuator 90 to switch the harvest discharge lever 13D to the rearward tilt position and the non-harvest discharge mode. In other words, the discharge operation continues.

[0090] If the parking brake pedal 15 is depressed and the main speed change lever 13A is operated from the neutral position to the forward tilt position or the rear tilt position while the discharge operation is continuing, and then the parking brake pedal 15 is released, the control device 65 activates the discharge lever switching actuator 90 to switch the harvest discharge lever 13D to the rear tilt position and the harvest non-discharge mode, but does not energize the forward solenoid or the reverse solenoid, so that the machine remains stopped. In other words, the discharge operation is stopped, but the operation of the main speed change lever 13A from the neutral position to the forward tilt position or the rear tilt position is ignored. To move forward or backward, the main speed change lever 13A is first returned to the neutral position, and then operated to the forward tilt position or the rear tilt position to move forward or backward.

[0091] Although the control based on the operation of the harvest product discharge lever 13D has been described, the same control is performed even if the harvest product discharge lever 13D is used as a harvest product discharge switch.

[0092] <Other embodiments> (1) In the first embodiment, an example is shown in which depression of the parking brake pedal 15 can perform the same scraping control as a conventional scraping switch, but it goes without saying that the present invention can also be applied to a combine harvester equipped with a conventional scraping switch.

[0093] That is, when a conventionally known pick-up switch is turned ON, the machine is stopped. Therefore, if the pick-up switch is ON during the discharge operation, even if the main shift lever 13A is operated from the neutral position to the forward tilt position or the rearward tilt position, the control device 65 does not operate the discharge lever switching actuator 90 to switch the harvest discharge lever 13D to the rearward tilt position and the non-harvest discharge mode. In other words, the discharge operation continues.

[0094] If the above-mentioned pick-up switch is turned ON and the main speed change lever 13A is operated from the neutral position to the forward tilt position or the rear tilt position while the discharge operation is continuing, and then the pick-up switch is turned OFF, the control device 65 activates the discharge lever switching actuator 90 to switch the harvest discharge lever 13D to the rear tilt position and non-harvest discharge mode, but does not energize the forward solenoid or reverse solenoid, leaving the machine stopped. Note that the drive system to the left and right traveling devices 2 in the transmission 31 is in a transmission state.

[0095] In other words, the discharge operation is stopped, but the operation of the main speed change lever 13A from the neutral position to the forward tilt position or rear tilt position is ignored. If you want to move forward or backward, you first return the main speed change lever 13A to the neutral position, and then operate it to the forward tilt position or rear tilt position to move forward or backward. [Explanation of symbols]

[0096] 1 Aircraft frame 3 Reaping device 4. Threshing equipment 5 Control Unit 7. Glentank 8 Discharge Auger 13E Mode select operation device (mode select lever) 15 Parking brake pedal 65 Control device

Claims

1. A combine harvester is provided with a reaping device (3) at the front of a machine frame (1), a threshing device (4), a control section (5), and a grain tank (7) for storing harvested material at the rear of the reaping device (3), and a discharge auger (8) for discharging the harvested material in the grain tank (7) outside the machine. When the machine is operated to move forward or backward during the discharge operation of operating the discharge auger (8) to discharge the harvested crops in the grain tank (7) outside the machine, the machine accelerates forward or backward more slowly than usual, This combine harvester is characterized in that, if the parking brake pedal (15) is depressed during discharge work, the operation of the discharge auger (8) is not stopped even if the machine is operated to move forward or backward, and when the parking brake pedal (15) is released from this state, the operation of the discharge auger (8) is stopped and the state in which the machine is restricted from moving forward or backward is maintained.

2. The combine harvester according to claim 1, characterized in that after the control device (65) stops the operation of the discharge auger (8) by operating the machine forward or backward during discharge work, the operation of the discharge auger (8) remains stopped even if the machine is stopped.

3. A combine harvester as described in claim 1 or claim 2, characterized in that after the control device (65) stops the operation of the discharge auger (8) by operating the machine forward or backward during discharge work, the operation of the discharge auger (8) is restricted unless the machine is stopped.

4. A combine harvester according to claim 1 or claim 2, characterized in that when the discharge auger (8) is moved from the storage position to the discharge operation position, the control device (65) sets the sub-transmission device to medium speed or low speed even if the mode select operating device (13E) is set to the road traveling mode.

Images