JP5530071B2 - Operation structure of agricultural work vehicle - Google Patents

Description

  The present invention relates to an operation structure for an agricultural work vehicle equipped with a working device at the rear part of a vehicle body, and provided with a guidance operation tool that enables guidance operation of the vehicle body from the ground side at the front part of the vehicle body.

In the operation structure of the agricultural work vehicle as described above, it is considered that it is desirable for the driver to get off the vehicle by providing a guidance operation tool at the front part of the vehicle body. When there is a risk that the vehicle body may deviate from the specified travel route during traveling over the ridge that enters or exits, or during loading or unloading where the vehicle body is loaded or unloaded using a step board. Can correct the trajectory of the vehicle body from the ground side by using the guidance operation tool. Also, when traveling over the fence or when unloading , if there is a risk that the front side of the vehicle body will be lifted due to the weight of the work device, etc., the guidance operation tool will be pushed down from the ground side. Therefore, the floating can be prevented.

Conventionally, in the operation structure of an agricultural work vehicle as described above, a stop lever that enables related operations from the ground side to the main clutch and the brake, and a stop lever stop from the ground side, in the vicinity of the guidance operation tool. Equipped with a locking lever that enables holding and releasing in position, and on the right side of the driver's seat, the lifting and lowering operation of the working device equipped to be able to move up and down at the rear of the vehicle body and switching the transmission state to the working device It has been considered to provide a planting lever that enables operation (see, for example, Patent Document 1).
JP 2002-362383 A

Incidentally, when performing such ridges across the travel and unloading cars that described above, advance, be allowed to increase the working device to an arbitrary height position in consideration of the gradient of such ridge slopes and the running board to run the vehicle body Generally done. In this way, it is possible to avoid the possibility that the work device may come into contact with the traveling surface such as the ground surface or the walking board during traveling over the ridge or when unloading . Further, the position of the center of gravity of the vehicle body can be lowered as compared with the case where the working device is raised to the upper limit position, and the stability of the vehicle body can be ensured.

However, when you actually go over the ridge or drive down and on, you may find that the slope of the heel slope or the walk board is tighter than you thought. In such a case, it is necessary to raise the working device again in order to avoid contact with the traveling surface of the working device. In order to perform the re-raising operation of the working device from the ground side, after operating the stop arm and the locking arm to stop the traveling of the vehicle body, the vehicle body located on the slope or on the walking board You will operate the planting lever on the right side of the driver's seat. For this reason, the re-raising operation of the working device has become troublesome.

  On the other hand, just before the end of the field work, in order to perform the work by the work device up to the end, there is a case where the end-of-work travel is performed in which the work by the work device is continued while climbing the vehicle body on the slope. Even at the end of this work, if the driver gets off the vehicle and there is a possibility that the vehicle body may deviate from the predetermined travel route, the vehicle body trajectory is corrected from the ground side using the guidance operation tool. When there is a possibility that the front side of the vehicle will be lifted up, the lifting operation is prevented by pressing the guiding operation tool downward from the ground side.

  At the end of the run after the completion of the work, the driver expects the work equipment to reach the shore while correcting the trajectory of the car body using the guidance operation tool and preventing the car body front side from being lifted. Rotate to the right side of the vehicle body located on the slope, and stop the operation of the work device or raise the work device by performing the operation of cutting off the transmission to the work device and the raising operation of the work device by the planting lever. However, the operation is stopped. For this reason, the operation on the work device at the end of the work and at the end of the traveling is troublesome.

The object of the present invention is to perform a re-raising operation of the working device from the ground side when traveling over the ridge or when loading and unloading , or an ascending operation or deactivation operation of the working device from the ground side when traveling at the end of work. It is to make it easy.

In order to achieve the above object, in the invention according to claim 1 of the present invention,
In the operation structure of an agricultural work vehicle equipped with a working device at the rear of the vehicle body, and provided with a guidance operation tool that enables guidance operation of the vehicle body from the ground side at the front of the vehicle body,
An elevating mechanism that enables elevating drive of the working device, and an interrupting mechanism that enables intermittent power to the working device,
In the boarding operation part formed on the vehicle body, an operation lever for work that enables switching operation of the operating state of the lifting mechanism and the intermittent mechanism is provided,
An urging means for urging the operation lever toward an operation position where the interrupting mechanism is in a shut-off state and the lifting mechanism is in an ascending state, and operation of the operation lever against the action of the urging means Holding means for enabling holding,
The guidance operation tool is equipped with an auxiliary operation tool that enables a holding release operation of the holding means from the ground side.

According to this characteristic structure, if during such that the ridge across the running and unloading cars above, need arises to re-increase the working device for tighter than the gradient of such ridge slopes and the running board is expected, If the auxiliary operation tool provided in the guidance operation tool is operated, the operation lever is held by the holding means while the vehicle is running, and the operation lever is turned off by the action of the biasing means. Then, the lifting mechanism is operated to the operating position where the lifting mechanism is in the raised state, and the work device is lifted based on the operation. Thereby, the possibility that the working device may come into contact with the traveling surface such as the ground or a walking board can be avoided.

It should be noted that the intermittent mechanism is not switched to the connected state during traveling over the overload or unloading , so that the intermittent mechanism is maintained in the disconnected state regardless of the displacement of the operation lever due to the action of the urging means.

  Further, at the end of the above-described end-of-work travel, for example, lifting of the front part of the vehicle body, which is likely to occur due to the climbing of the vehicle body, is prevented by pressing down the guidance operation tool, while If the auxiliary operation tool provided in the guidance operation tool is operated at an appropriate time in anticipation of reaching the vehicle, the operation lever is operated to the operation position as described above while maintaining the traveling of the vehicle body. The working device stops operating and rises. Thereby, unnecessary operation | movement of the working device on a cage | basket can be prevented, and the possibility that a working device may contact a cage | basket can be avoided beforehand.

Therefore, the re-raising operation of the work device from the ground side when traveling over a load or unloading , and the operation stop operation and lifting operation of the work device from the ground side when traveling at the end of work are easily and reliably performed. Yes. As a result, when traveling over a fence or unloading , avoiding the risk of the work device coming into contact with the ground or a running surface such as a step board, loading / unloading the vehicle body into / from the field or loading the truck bed. Can be lowered smoothly. Also, when traveling at the end of work, the vehicle body is smoothly escaped from the field while preventing unnecessary operation of the work device on the hoe and avoiding the possibility of the work device coming into contact with the hoe. be able to.

In the invention according to claim 2 of the present invention,
In the operation structure of an agricultural work vehicle equipped with a working device at the rear of the vehicle body, and provided with a guidance operation tool that enables guidance operation of the vehicle body from the ground side at the front of the vehicle body,
An elevating mechanism enabling the elevating drive of the working device;
The guidance operation tool is equipped with an auxiliary operation tool that enables switching of the operating state of the lifting mechanism from the ground side so as to be able to swing in the internal space of the guidance operation tool. It is characterized by being.

According to this characteristic structure, during such the ridge across the running and unloading cars above, for tighter than the gradient of such ridge slopes and the running board thought, when the need to re-increase the working device occurs By operating the auxiliary operation tool provided in the guidance operation tool, the work device is moved to an appropriate height position according to the slope of the saddle slope or the walking board, etc., which has been re-recognized at that time while maintaining the traveling of the vehicle body. Can be raised easily. Thereby, the possibility that the working device may come into contact with the traveling surface such as the ground or a walking board can be avoided. Further, the position of the center of gravity of the vehicle body can be lowered as compared with the case where the working device is raised to the upper limit position, and the stability of the vehicle body can be ensured.

  Further, when traveling at the end of the above-described operation, for example, the guidance operating tool is provided while preventing the lifting of the front of the vehicle body, which is likely to occur due to the climbing of the vehicle body, by pressing the guidance operating tool downward. By operating the auxiliary operation tool, it is possible to raise the work device with an appropriate lifting operation amount according to the amount of change as the posture of the vehicle body changes in the upward direction due to the climbing of the vehicle body Become. As a result, it is possible to prevent the working device from sinking due to the climbing of the vehicle body when traveling at the end of work, and to avoid the possibility of the working device coming into contact with the kite after the end of traveling at the end of work. Can do.

Therefore, the re-raising operation of the working device from the ground side during traveling over the ridge or during unloading traveling and the ascending operation of the working device from the ground side during traveling after the work can be performed easily and reliably. As a result, when traveling over a fence or unloading , avoiding the risk of the work device coming into contact with the ground or a running surface such as a step board, loading / unloading the vehicle body into / from the field or loading the truck bed. Can be lowered smoothly. In addition, when traveling at the end of work, it is possible to improve the accuracy of the work at the time of traveling at the end of the work. Escape smoothly from the field.

In the invention according to claim 3 of the present invention,
In the operation structure of an agricultural work vehicle equipped with a working device at the rear of the vehicle body, and provided with a guidance operation tool that enables guidance operation of the vehicle body from the ground side at the front of the vehicle body,
Comprising an interrupting mechanism that enables interrupting of power to the working device;
The guidance operation tool is equipped with an auxiliary operation tool that enables a switching operation of the interrupting mechanism from the ground side so that a swing operation in the internal space of the guidance operation tool is possible. It is characterized by being.

  According to this characteristic configuration, at the end of the above-described work end travel, for example, the working device prevents the lifting of the front side of the vehicle body, which is likely to occur due to the climbing of the vehicle body, by pressing the guidance operation tool downward. By operating the auxiliary operation tool provided in the guidance operation tool at an appropriate time in anticipation of the arrival of the vehicle, the work device can be stopped while maintaining the traveling of the vehicle body. Thereby, the unnecessary operation | movement of the working apparatus on a cage | basket can be prevented.

  Therefore, the operation stop operation of the work device from the ground side at the end of work can be easily and reliably performed. As a result, when traveling at the end of work, it is possible to smoothly escape the vehicle body from the field while preventing unnecessary operation of the work device on the fence.

[First Embodiment]

  Hereinafter, as an example of the best mode for carrying out the present invention, a first embodiment in which the operation structure of an agricultural work vehicle according to the present invention is applied to a riding rice transplanter that is an example of an agricultural work vehicle is described with reference to the drawings. explain.

  FIG. 1 is an overall side view of a riding rice transplanter. FIG. 2 is an overall plan view of the riding rice transplanter. As shown in these drawings, this riding rice transplanter is a four-row planting that is an example of a working device A, via a link mechanism 3 that swings up and down by the operation of a hydraulic lifting cylinder 2 at the rear of a vehicle body 1. The seedling planting device 4 is connected so as to be movable up and down, and a mid-mount fertilizer application device 5 which is an example of the working device A is provided, so that a mid-mount fertilization specification for four-row planting is configured.

  As shown in FIGS. 1 to 5, the vehicle body 1 has an air-cooled engine 6 mounted on the front thereof in a vibration-proof manner. A boarding operation unit 7 is formed on the upper side of the vehicle body 1. A transmission system 10 for transmitting power from the engine 6 to the pair of left and right front wheels 8 and the pair of left and right rear wheels 9 is disposed on the lower side of the vehicle body 1. At the front end of the vehicle body 1, a guidance operation tool 11 is provided that enables the vehicle body 1 to be guided or pushed down from the position of getting off the vehicle body (on the ground side).

  As shown in FIGS. 1 to 4, the boarding operation unit 7 includes a steering wheel 12 for front wheel steering, a main transmission lever 13, an auxiliary transmission lever 14, a clutch / brake pedal 15, a differential lock pedal 16, and a work operation lever 17. And a driver's seat 18 and the like.

  As shown in FIGS. 1 and 4 to 6, the transmission system 10 includes a belt tension type main clutch 19 that interrupts power from the engine 6, and a hydrostatic continuously variable transmission (hereinafter referred to as a main transmission). HST) 20 and a gear-type sub-transmission device 22 and a gear-type inter-company transmission 23 provided inside a transmission case (hereinafter abbreviated as T / M case) 21. .

  As shown in FIGS. 5 and 6, in the transmission system 10, the power from the engine 6 is transmitted to the HST 20 via the main clutch 19. The power after shifting by the HST 20 is distributed to the auxiliary transmission 22 and the inter-company transmission 23. The power after the shift by the auxiliary transmission 22 is transmitted to the left and right front wheels 8 via the front wheel differential device 24 and the like, and left and right via the chain transmission 25 and the pair of left and right side clutches 26 and the like. Is transmitted to the rear wheel 9. The power after the shift by the inter-strain transmission 23 is transmitted to the seedling planting device 4 through a gear type transmission mechanism 27, a planting clutch 28, and the like. The chain type transmission device 25 is equipped with a sprocket 29 for power distribution, and the power distributed from the sprocket 29 is transmitted to the fertilizer 5 via the fertilizer clutch 30 and the like.

  That is, in this embodiment, the planting clutch 28 and the fertilizer clutch 30 are the intermittent mechanism B that enables the power to the work devices 4 and 5 to be intermittent.

  As shown in FIGS. 1 and 2, the seedling planting device 4 includes a power distribution mechanism 31, a seedling mount 32, a lateral feed mechanism (not shown), four sets of rotary planting mechanisms 33, and three leveling machines. The float 34, the vertical feed mechanism 35, and the like are provided so that up to four seedlings can be planted. The power distribution mechanism 31 distributes and supplies power from the vehicle body 1 to the lateral feed mechanism, each planting mechanism 33, and the vertical feed mechanism 35. The seedling stage 32 is formed to place a maximum of four mat-like seedlings. The lateral feed mechanism reciprocates the seedling stage 32 with a constant stroke in the left-right direction by the power from the power distribution mechanism 31. Each planting mechanism 33 cuts a predetermined amount of planted seedlings from the lower end of the mat-like seedling placed on the seedling placing stand 32 by the power from the power distribution mechanism 31, and uses the planted seedlings that have been cut off for each leveling float. Planted in the mud portion of the field prepared by 34. Each leveling float 34 is mounted on the seedling planting device 4 so as to be able to swing up and down with its rear end as a fulcrum, and slides while leveling the mud surface of the field as the vehicle body 1 travels. . The vertical feed mechanism 35 feeds each mat-like seedling vertically to the lower end of the seedling stage 32 at a predetermined pitch by the power from the power distribution mechanism 31 every time the seedling stage 32 reaches the left and right stroke ends.

  The fertilizer applicator 5 includes a hopper 36 for storing fertilizer, a pair of left and right feeding mechanisms 37, an electric fertilizer fan 38, four fertilizer hoses 39, and four groovers 40, and the like. It is configured to perform side strip fertilization. Each feeding mechanism 37 is mounted on the rear portion of the vehicle body 1 together with the hopper 36 and the fertilizer fan 38, and feeds the granular fertilizer stored in the hopper 36 by a predetermined amount by the power from the vehicle body 1. The fertilizer fan 38 generates a conveying wind by its operation, and the fertilizer fed by each feeding mechanism 37 is conveyed by wind with the conveying wind. Each fertilizer hose 39 guides the powdered fertilizer conveyed by wind toward the corresponding grooving device 40. Each grooving device 40 is arranged on a leveling float 34 corresponding to a predetermined interval in the left-right direction, and forms a fertilization groove in the mud portion of the field as the vehicle body 1 travels, and is conveyed in the groove. The guided granular fertilizer is buried.

  As shown in FIGS. 2 to 7, the main clutch 19 has an on state in which power from the engine 6 is transmitted to the HST 20 and a cut off state in which transmission from the engine 6 to the HST 20 is interrupted by the swing of the tension arm 41. Switch to. The tension arm 41 is oscillated and biased by the action of the spring 42 from the cut position where the transmission from the engine 6 to the HST 20 is cut off to the entry position where the power from the engine 6 is transmitted to the HST 20. The tension arm 41 is linked to the clutch / brake pedal 15 disposed at the right foot of the boarding operation unit 16 via a linkage rod 43 and the like.

  As shown in FIGS. 4, 5, and 7, the clutch / brake pedal 15 is configured to be swingable in the stepping direction with the base end 15 </ b> A as a fulcrum. A spring 44 is externally fitted to the base end portion 15 </ b> A of the clutch / brake pedal 15 to swing and urge the clutch / brake pedal 15 toward the non-operation position. The clutch / brake pedal 15 is linked to the operation arm 48 of the brake 47 via a linkage rod 45, a linkage spring 46, and the like. The brake 47 is provided inside the T / M case 21.

  From this configuration, the main clutch 19 is normally held in the engaged state by the action of the spring 42. The brake 47 is held in a non-braking state by the action of the spring 44. When the depression operation of the clutch / brake pedal 15 is performed, the main clutch 19 switches from the engaged state to the disengaged state against the action of the spring 42, and the brake 47 resists the action of the spring 44 from the non-braking state. Switch to the braking state. When the depression of the clutch / brake pedal 15 is released, the main clutch 19 is switched from the disengaged state to the engaged state by the action of the spring 42 and held in the engaged state, and the brake 47 is released from the braking state by the action of the spring 44. The braking state is switched and the non-braking state is maintained.

  As shown in FIGS. 4, 8, and 9, the HST 20 has a trunnion shaft 49 linked to a main transmission lever 13 disposed on the left side of the steering wheel 12 via a main transmission linkage mechanism 50. As a result, the HST 20 is switched to a shift state corresponding to the operation position of the main transmission lever 13 by the swing operation of the main transmission lever 13.

  The main transmission linkage mechanism 50 swings integrally with the main transmission lever 13 in the front-rear direction, and allows the main transmission lever 13 to swing in the left-right direction. The first linkage rod 52 that is pushed and pulled in conjunction with the swinging arm, the swing arm 53 that swings up and down in conjunction with the push and pull of the first linkage rod 52, and the push and pull in conjunction with the swing of the swing arm 53 The second linkage rod 54 is used.

  The linkage mechanism 50 for the main transmission enables the main transmission lever 13 to be engaged and held at a plurality of shift operation positions against the action of the V-shaped cam neutral return mechanism 55 provided on the trunnion shaft 49. A detent mechanism 56 for shifting operation is provided. As a result, the main shift lever 13 is moved to the neutral position, a plurality of forward shift operation positions positioned on the vehicle front side of the neutral position, and a plurality of reverse shift operations positioned on the vehicle body rear side of the neutral position. Operation can be held at each of the positions.

  The main shift lever 13 is a neutral region that connects the forward / backward swing operation along the forward shift operation region, the forward / backward swing operation along the reverse shift operation region, and the neutral position. And a swinging operation in the left-right direction along the line. A spring 57 is externally fitted to the base end portion 13 </ b> A of the main transmission lever 13 to swing and urge the main transmission lever 13 toward the forward shift operation region (rightward).

  As shown in FIGS. 4 to 6, the auxiliary transmission 22 is linked to the auxiliary transmission lever 14 provided with the shift gear 58 behind the HST 20 via an association rod 59 and the like. As a result, the sub-transmission device 22 is switched to a two-step shift state corresponding to the operation position of the sub-transmission lever 14 by the swinging operation of the sub-transmission lever 14 in the left-right direction.

  As shown in FIG. 5 and FIG. 6, in the inter-company transmission 23, the shift key 60 is linked to an inter-company shifting operation tool (not shown) via a linking rod 61 and the like. As a result, the inter-variety transmission 23 is switched to a three-speed shift state corresponding to the operation position of the operating tool by operating the operating tool.

  The differential device 24 includes a casing 62 that rotates integrally with the shift gear 58 of the auxiliary transmission 22, a pinion gear 63 that is rotatably supported by the casing 62, a pair of left and right side gears 64 that mesh with the pinion gear 63, and the like. ing. The left side gear 64 is spline fitted to the left front wheel drive shaft 65 of the pair of left and right front wheel drive shafts 65, and the right side gear 64 is spline fitted to the right front wheel drive shaft 65.

  On the left side of the differential device 24, a differential lock mechanism 66 that prevents the differential of the left and right front wheels 8 due to the action of the differential device 24 is provided. The diff lock mechanism 66 rotates integrally with the left front wheel drive shaft 65 and is provided with a shift claw 67 externally fitted to the left front wheel drive shaft 65 so as to be able to slide relative to the left front wheel drive shaft 65. An engaging claw 62A formed on the casing 62 of the differential 24 so as to be able to engage with the shift claw 67, and a spring 68 for slidingly biasing the shift claw 67 in a direction away from the engaging claw 62A, Etc.

  As shown in FIGS. 4, 6, and 11, the shift claw 67 of the diff lock mechanism 66 is linked to the diff lock pedal 16 disposed behind the auxiliary transmission lever 14 via a diff lock linkage mechanism 69. The differential lock linkage mechanism 69 includes a crank arm 70 that swings in conjunction with the up-and-down sliding of the differential lock pedal 16, a linkage rod 71 that is pushed and pulled in conjunction with the swing of the crank arm 70, and one end portion of the linkage rod 71. Are connected to each other, a cam shaft 73 to which the connection plate 72 is welded, a spring 74 that slidably biases the differential lock pedal 16 upward via the crank arm 70, and the like. .

  One end of the linking rod 71 is engaged with an arc-shaped elongated hole 72 </ b> A formed in the linking plate 72 around the cam shaft 73. The cam shaft 73 rotates about its axis to allow the shift claw 67 to be separated from the engagement claw 62A by the action of the spring 68, and the difference between the left and right front wheels 8 by the differential device 24. A differential position that allows movement, and a differential stop position that engages the shift claw 67 with the engagement claw 62A against the action of the spring 68 and prevents the differential between the left and right front wheels 8 by the differential device 24. And switch to The long hole 72A of the linkage plate 72 is interlocked with the depression operation of the differential lock pedal 16, so that the cam shaft 73 is rotationally displaced from the differential position toward the differential stop position, and the differential lock pedal 16 is not locked. The camshaft 73 is formed so as to allow a rotational displacement from the differential position to the differential stop position in the state where the camshaft 73 is located.

  With this configuration, the differential device 24 is configured such that the differential lock pedal 16 is held in the unlocked position by the action of the spring 74, and the shift claw 67 is separated from the engagement claw 62A by the action of the spring 68. It is held in a differential state that allows differential. When the operation of depressing the differential lock pedal 16 to the locked position against the action of the spring 74 is performed, the shift claw 67 engages with the engagement claw 62A against the action of the spring 68, so Is switched to a differential stop state in which differential of the front wheel 8 is blocked. When the operation of depressing the differential lock pedal 16 is released, the differential lock pedal 16 is returned to the unlocked position by the action of the spring 74, and the shift claw 67 is separated from the engagement claw 62A by the action of the spring 68. The differential state allowing the differential of 8 is restored and held.

  As shown in FIGS. 6, 9, 12, and 13, the planting clutch 28 transmits the power after shifting by the inter-strain transmission 23 to the seedling planting device 4 by the sliding operation of the operation pin 75. It is switched between a connection state and a cut-off state that cuts off its transmission. The operation pin 75 is linked to an operation lever 17 for operation provided on the right side of the steering wheel 12 via a planting transmission linkage mechanism 76.

  The linking mechanism 76 for planting transmission swings integrally with the operation lever 17 in the front-rear direction, and also interlocks with the swing member 77 that allows the operation lever 17 to swing in the left-right direction, and the front-rear swing of the operation lever 17. The first linking rod 78 pushed and pulled through the oscillating member 77, the first oscillating plate 79 engaged with the first linking rod 78, and pushed in conjunction with the oscillation of the first oscillating plate 79. The second linking rod 80 to be pulled, the second oscillating plate 81 extending between the second linking rod 80 and the operating pin 75 of the planting clutch 28, and the operating pin 75 from the connection position via the second oscillating plate 81. A spring 82 that slidably biases toward the blocking position is formed.

  As shown in FIGS. 9 and 12, the operation lever 17 for work can be swung in the front-rear direction and swinging in the left-right direction, and is a hydraulic damper (an example of a biasing means) 83. As a result, the rocking bias is applied toward the raised position on the rear side of the vehicle body. Then, against the action of the hydraulic damper 83, a neutral position on the vehicle body front side relative to the raised position, a lowered position on the vehicle body front side relative to the neutral position, and a planting position on the vehicle body front side relative to the lowered position, Each can be swung. Further, the operation detent mechanism (an example of a holding unit) 84 can be operated and held at each of the neutral position, the lowered position, and the planting position against the action of the hydraulic damper 83 by the action of the work operation detent mechanism (an example of the holding means). Further, a swinging operation in the left-right direction is allowed at the planting position.

  As shown in FIGS. 9, 12, and 13, in the planting transmission linkage mechanism 76, the first swing plate 79 is allowed to swing about a left and right support shaft 85 as a fulcrum. The second oscillating plate 81 is allowed to oscillate about a vertically-supporting shaft 86 as a fulcrum. The first swing plate 79 is formed with an arc-shaped long hole 79A centering on the support shaft 85. When the operating lever 17 is swung between the raised position and the lowered position, the first linkage rod 78 and the first rocking plate 79 can be moved regardless of the operation by the elongated hole 79A. The operation pin 75 is held in the blocking position by the action of the spring 82, and when the operation lever 17 is swung from the lowered position to the planting position, the operation pin 75 is interlocked with the operation. Further, when the operation lever 17 is swung from the planting position to the lowered position so that it is slid to the connection position against the action of the spring 82, the operation pin is linked with the operation. 75 is linked so as to be slid to the blocking position by the action of the spring 82.

  From this configuration, when the operation lever 17 is operated to any one of the raised position, the neutral position, and the lowered position, the planting clutch 28 is brought into a disconnected state by the action of the spring 82, When the operation lever 17 is operated to the planting position, a connection state appears against the action of the spring 82.

  That is, each of the raised position, neutral position, and lowered position of the operation lever 17 is set to an operation position that sets the operating state of the planting clutch 28 to the disconnected state.

  As shown in FIG. 5, the fertilizer clutch 30 includes a shift claw 88 that is spline-fitted to the crankshaft 87, an engagement claw 29A formed on the sprocket 29, and a direction in which the shift claw 88 is away from the engagement claw 29A. The spring 89 is configured to be slidably biased. Then, the sliding operation of the shift claw 88 switches between a connected state in which power after shifting by the auxiliary transmission 22 is transmitted to the fertilizer application 5 and a disconnected state in which transmission is interrupted.

  As shown in FIGS. 5 and 13, the shift claw 88 of the fertilization clutch 30 is linked to the second linkage rod 80 of the planting transmission linkage mechanism 76 via the fertilization transmission linkage mechanism 90. The fertilizer transmission linkage mechanism 90 swings about the first swing arm 91 swinging about a vertically supporting shaft 86 in conjunction with the push-pull of the second link rod 80, and the first swing arm 91 swinging. A linkage rod 92 that is pushed and pulled in conjunction with each other, a second swing arm 93 to which one end of the linkage rod 92 is engaged, a cam shaft 94 to which the second swing arm 93 is welded, and a first swing. A spring 95 acting on the cam shaft 94 via an arm 91 or the like is used.

  The cam shaft 94 is rotated with its axis as a fulcrum, so that the shift claw 88 is allowed to move away from the engaging claw 29A by the action of the spring 89, and the cam 68 is shifted against the action of the spring 68. The claw 67 is switched to the connection position where the claw 67 is engaged with the engagement claw 62A. The spring 95 urges the cam shaft 94 to rotate toward the cutting position via the first swing arm 91 or the like.

  As described above, the first connecting rod 78 and the first swing plate 79 are linked through the long hole 79A of the first swing plate 79, so that the operation lever 17 is moved up and down. Regardless of the operation, the cam shaft 94 is held at the blocking position by the action of the spring 95, and the operation lever 17 is swung from the lowered position to the planting position. When operated, the cam shaft 94 is rotated to the connection position against the action of the spring 95 in conjunction with the operation, and the operation lever 17 is swung from the planting position to the lowered position. In such a case, the cam shaft 94 is rotated to the blocking position by the action of the spring 95 in conjunction with the operation.

  Due to this configuration, the fertilizer application clutch 30 is brought into a shut-off state by the action of the spring 89 when the operation lever 17 is operated to any one of the raised position, the neutral position, and the lowered position. When the lever 17 is operated to the planting position, the connection state appears against the action of the spring 89.

  That is, each of the raised position, the neutral position, and the lowered position of the operation lever 17 is set to an operation position where the operating state of the fertilizer application clutch 30 is cut off.

  The operation lever 17 can be used for operation of a work clutch that enables the operation of switching the operation state of the planting clutch 28 and the fertilization clutch 30 from the boarding operation unit 16.

  The crankshaft 87 is linked to the feeding mechanism 37 of the fertilizer applicator 5 via a linkage rod 96, a one-way clutch (not shown) for forward power transmission, and the like. That is, the feeding mechanism 37 of the fertilizer application device 5 is driven by the forward power transmitted through the fertilizer clutch 30 and the like.

  As shown in FIGS. 9, 12 and 13, the operation lever 17 for work is provided on a lifting / lowering spool 98 provided in a lifting / lowering valve 97 for controlling the flow of hydraulic oil to the lifting / lowering cylinder 2. They are linked via a one linkage mechanism 99. The spool 98 is slidably biased toward a lowered position where hydraulic oil is discharged from the lift cylinder 2 and the seedling planting device 4 is lowered by the action of a spring (not shown) provided in the lift valve 97. ing. Further, the sliding operation is performed against the action of the spring, so that the working oil is supplied to the lifting cylinder 2 to raise the seedling planting device 4 and the working oil is supplied to and discharged from the lifting cylinder 2. It stops and is displaced to the neutral position where the seedling planting device 4 stops moving up and down.

  In other words, in the present embodiment, the elevating cylinder C and the elevating valve 97 constitute an elevating mechanism C that enables the seedling planting device 4 to be elevated.

  The first linkage mechanism 99 is a swinging member 77 and a first linkage rod 78 that are also used as a planting transmission linkage mechanism 76, and a swinging arrangement provided in parallel to the left side of the first transmission plate 79 for planting transmission. It is comprised by the board 100 etc. The swinging plate 100 is allowed to swing about the left and right support shaft 85 as a fulcrum, and acts on the spool 98 of the lift valve 97 by the swinging. Specifically, when the operation lever 17 is located at the raised position, the swinging plate 100 supplies the spool 98 and hydraulic oil to the elevating cylinder 2 against the action of the spring, and the seedling planting device. 4. Position 4 in the raised position. When the operation lever 17 is positioned at the neutral position, the spool 98 is positioned at the neutral position at which the raising and stopping of the seedling planting device 4 is stopped by stopping the supply and discharge of the hydraulic oil to and from the lifting cylinder 2 against the action of the spring. Let When the operation lever 17 is located at the lowered position and the planting position, it acts on the spool 98 based on the vertical swing of the leveling float (hereinafter referred to as center float) 34 located at the center of the left and right.

  The swing plate 100 is linked to the front end side of the center float 34 via a second linkage mechanism 101 for planting and lifting. The second linkage mechanism 101 includes a linkage rod 102 that swings the swing plate 100 in conjunction with the vertical swing of the center float 34. The swing plate 100 is formed with an arc-shaped long hole 100A centering on a left and right support shaft 85 which is the swing support point. When the center float 34 is floating, the long hole 100A comes into contact with the connecting rod 78 at the lower end edge thereof to limit the downward swing of the center float 34. Further, when the operation lever 17 is swung to the lowered position or the planting position and the center float 34 is grounded, the center float 34 and the swing plate 100 via the second linkage mechanism 101 are moved. The interlocking swing is allowed, and the sliding operation of the spool 98 by the swing plate 100 is allowed.

  As a result, the swinging plate 100 is swung to the predetermined position when the operating lever 17 is swung to the lowered position or the planting position and the center float 34 is grounded. When the swinging displacement is below the posture, the sliding operation of the spool 98 to the lowered position by the action of the spring is allowed. When the swinging posture of the leveling float 34 is swinging and displaced above a predetermined reference posture, the spool 98 is slid to the raised position against the action of the spring. When the swinging posture of the leveling float 34 has reached a predetermined reference posture, the spool 7 is slid to the neutral position against the action of the spring.

  From the above configuration, the seedling planting device 4 can be raised toward the predetermined upper limit position by swinging the operating lever 17 to the raised position. By swinging the operation lever 17 to the lowered position, the seedling planting device 4 can be lowered toward a predetermined grounding work height position where the swing posture of the center float 34 becomes a predetermined reference posture. it can. By swinging the operation lever 17 to the neutral position, the seedling planting device 4 can be lifted and stopped at an arbitrary height position.

  That is, the operation lever 17 can be used for lifting operation that enables switching of the operating state of the lifting mechanism C from the boarding operation unit 16.

  Further, when the seedling planting device 4 is grounded by holding the operation lever 17 in the lowered position or the planting position, the seedling planting device 4 is moved to a predetermined grounding work height position based on the vertical swing of the center float 34. Can be maintained. Thereby, at the time of the planting operation for holding the operation lever 17 at the planting position, the seedling planting depth by the seedling planting device 4 can be made constant regardless of the ups and downs of the field, and the planting operation accuracy can be improved. Can do.

  And in this embodiment, the raising position of the operation lever 17 is set to the operation position which makes the operation state of the planting clutch 28 and the fertilization clutch 30 into the interruption | blocking state, and makes the operation state of the raising / lowering mechanism C an up state. Yes.

  Although illustration is omitted, the operation lever 17 for work is in a pair of left and right holding mechanisms that hold the pair of left and right drawing markers 103 (see FIGS. 1 and 2) in the retracted position in a state of being in the planting position. They are linked through a marker releasing linkage mechanism. The linkage mechanism for releasing the marker releases the holding of the drawing marker 103 in the retracted position by the holding mechanism on the side corresponding to the operation direction when the operation lever 17 is swung to the left or right at the planting position. To do.

  As shown in FIG. 1 and FIG. 2, the left and right line drawing markers 103 are stowed along the seedling planting device 4 so that their tips are separated from the field mud surface, and their tips enter the field mud surface. Thus, the seedling planting device 4 is equipped so as to be able to switch the posture by swinging up and down between the acting posture of lying down toward the laterally outward side of the seedling planting device 4.

  Although illustration is omitted, the seedling planting device 4 is provided with a pair of left and right springs that swing and bias the corresponding drawing marker 103 from the retracted posture toward the acting posture. The left and right line drawing markers 103 are used for storing a marker so as to switch from the acting position to the retracted position against the action of the left and right springs in conjunction with the raising operation of the seedling planting device 4 to a predetermined upper limit position. It is linked to the link mechanism 3 via a linkage mechanism. The left and right holding mechanisms hold the corresponding drawing marker 103 in the retracted posture by engaging with the drawing marker 103 that is switched from the acting posture to the retracted posture in conjunction with the raising operation of the seedling planting device 4.

  That is, from the above configuration, when the operation lever 17 located at the planting position is swung leftward, the left drawing marker 103 can be switched from the retracted position to the operating position by the action of the spring. Conversely, when the operation lever 17 located at the planting position is swung to the right, the right drawing marker 103 can be switched from the retracted position to the operating position by the action of the spring. When the operation lever 17 located at the planting position is swung to the raised position, the drawing marker 103 in the action posture can be switched to the stored posture and held in the stored posture as the seedling planting device 4 is raised.

  As shown in FIGS. 4, 6, 8, 9, 12, and 13, the main transmission lever 13 is linked to the shift fork 104 of the planting clutch 28 via the first linkage mechanism 105 for backup. ing. Further, it is linked to a work operation detent mechanism 84 via a backup second linkage mechanism 106.

  The first linkage mechanism 105 for backup includes a first linkage rod 107 that is pushed and pulled in conjunction with the right and left swing of the main transmission lever 13, a first swing arm 108 that is engaged with the first linkage rod 107, A second oscillating arm 110 that oscillates integrally with the first oscillating arm 108 via a rotating shaft 109 that is oriented, a second linkage rod 111 that is pushed and pulled in conjunction with the oscillation of the second oscillating arm 110, The third swing arm 112 with which the two linkage rods 111 are engaged, the up and down rotating shaft 113 that connects the shift fork 104 so as to swing integrally with the third swing arm 112, and the like. .

  The first swing arm 108 is formed with an arc-shaped long hole 108A centering on the swing axis. The long hole 108A allows the first swing arm 108 to swing in conjunction with the intermittent operation of the planting clutch 28 by the work lever 17 when the main shift lever 13 is located in the forward shift operation region. Further, when the main shift lever 13 is swung from the forward shift operation region to the reverse shift operation region, the first swing arm 108 is swung downward in conjunction with the operation. The shift fork 104 of the planting clutch 28 is set so as to swing and displace from the connection position toward the cutoff position.

  The second linkage mechanism 106 for backup includes a first linkage rod 107 that is also used as the first linkage mechanism 105, a linkage pin 114 that is welded to the first linkage rod 107 in the left-right direction, and a first linkage pin 114 that is engaged with the linkage pin 114. The swinging member 115 and the first swinging member 115 are constituted by a rotating shaft 116 coupled to the left end portion.

  The first swing member 115 swings integrally with the detent arm 117 of the work operation detent mechanism 84 via the rotating shaft 116. A spring 118 that externally swings and biases the detent arm 117 in the engaging direction is fitted on the rotating shaft 116. The first swing member 115 is formed with an arc-shaped elongated hole 115A centering on the rotation shaft 116. The elongated hole 115A allows the detent arm 117 to swing in the engagement / disengagement direction with respect to the swing member 77 when the main shift lever 13 is positioned in the forward shift operation region. When a swing operation is performed from the forward shift operation region to the reverse shift operation region, the first swing member 115 is swung downward against the action of the spring 118 in conjunction with the operation. Thus, the detent arm 117 is set to be separated from the swinging member 77.

  From the above configuration, the backup first linkage mechanism 105 allows the work clutch 17 to be intermittently operated by the operation lever 17 when the main shift lever 13 is positioned in the forward shift operation region. In the connected state of the planting clutch 28, when the main transmission lever 13 is swung from the forward shifting operation region to the reverse shifting operation region, the planting clutch 28 is operated in conjunction with the operation. Switch from connected to disconnected state.

  On the other hand, when the main transmission lever 13 is positioned in the forward shift operation region, the second linkage mechanism 106 for backup maintains the position of the operation lever 17 for operation by the detent mechanism 84 for operation, The main shift lever 13 is swung from the forward shift operation region to the reverse shift operation region, allowing the operation lever 17 to swing against the operation of the operation detent mechanism 84. In this case, in conjunction with the operation, the position holding of the operation lever 17 by the work operation detent mechanism 84 is released, and the operation lever 17 is moved to the raised position by the action of the hydraulic damper 83. Allow dynamic operation.

  That is, when the seedling planting device 4 is grounded by swinging the main speed change lever 13 from the forward shift operation region to the reverse shift operation region, in conjunction with the operation, The seedling planting device 4 stops operating and rises toward a predetermined upper limit position. If the seedling planting device 4 does not reach the predetermined upper limit position, seedling planting is performed in conjunction with the operation. The device 4 is raised toward a predetermined upper limit position.

  As a result, the seedling planting device 4 can be prevented from being damaged due to the reverse state appearing while the seedling planting device 4 is in the grounding operation or in the grounded state.

  As shown in FIGS. 1 to 4 and FIG. 14, the guidance operation tool 11 is bent and formed in an arch shape, and both ends of the guidance operation tool 11 are arranged on the vehicle body 1 so that a swing operation with a left-right axis as a fulcrum is possible. Is connected to the front end portion of the engine frame 119 provided at the front portion. Between the right end portion of the guidance operation tool 11 and the engine frame 119, a holding mechanism (not shown) that enables switching and holding between the standing posture and the lying posture of the guidance operation tool 11 is interposed. A sighting tool 120 for aligning the left and right center of the vehicle body 1 with the traveling reference line formed on the field mud surface by the drawing marker 103 is provided at the upper end of the guidance operation tool 11. The sighting tool 120 is positioned inward of the guidance operation tool 11 in a posture that projects outward from the guidance operation tool 11 in a posture along the extension direction of the guidance operation tool 11 and in a posture along the extension direction of the guidance operation tool 11. The position can be switched between the stored position and the stored position.

  With this configuration, when driving on the road where the driver gets on and drives the vehicle body 1 from the boarding driving unit 16 or when working, the guidance operation tool 11 is placed in an upright posture with a minimum length extending forward of the vehicle body. By switching and switching the aiming tool 12 to the protruding posture, contact with the guidance operation tool 11 and the other object of the aiming tool 12 can be avoided. In addition, when working, the sighting tool 120 is positioned in a standing posture in front of the driver, which makes it easier to align the sighting tool 120 with the traveling reference line and facilitate traveling along the traveling reference line. .

On the other hand, it is desirable that the driver get off the vehicle, for example, traveling over a ridge that makes the vehicle body 1 enter or leave the field, or unloading the vehicle body 1 from a truck bed using a step board. When performing loading and unloading traveling, the guidance operation tool 11 is switched to a lying posture where substantially the whole extends toward the front of the vehicle body 1, and the sighting tool 12 is switched to a retracted posture. When there is a possibility that the vehicle body 1 may come off the predetermined travel route while avoiding contact with the other object of the sighting tool 12, the trajectory correction using the guidance operation tool 11 is inconvenient for the sighting tool 12 to become an obstacle. It can be done from the getting off position (ground side) in front of the vehicle body without incurring. Further, when traveling over the ridge or when unloading the vehicle, if there is a possibility that the front side of the vehicle body 1 may be lifted due to the weight of the seedling planting device 4 or the like, the guidance operation tool 11 is moved to the front of the vehicle body. By pressing down from the getting-off position, the lifting can be prevented.

  The front end of the engine frame 119 is provided with a stopper 121 that prevents the guiding operation tool 11 from swinging downward from the lying position by receiving the base end of the guiding operation tool 11 that is switched to the lying position. Yes.

  As shown in FIGS. 1, 3, 4, 7, and 14, the operation arm 122 can swing on the left side of the guidance operation tool 11 with a horizontal axis as a fulcrum. Equipped as The operation arm 122 is set to a non-operation position where the free end side contacts the proximal end side of the guidance operation tool 11, and the position where the free end side contacts the free end side of the guidance operation tool 11 is the operation position. And is held back to the non-operation position by the action of a spring 123 provided on the swing fulcrum. Then, in conjunction with the swing operation from the non-operation position to the operation position against the action of the spring 123, the clutch / brake pedal 15 swings and displaces from the non-operation position to the operation position. A swinging operation from the operating position to the non-operating position by the action causes the return swing from the operating position of the clutch / brake pedal 15 to the non-operating position by the action of the spring 44, via the linkage wire 124 or the like. The clutch / brake pedal 15 is linked.

  That is, in the state where the guidance operation tool 11 is switched to the lying posture, the clutch / brake pedal 15 in the boarding operation unit 16 can be used even from the dismounting position in front of the vehicle body by using the operation arm 122 provided in the guidance operation tool 11. Similarly to the above operation, the vehicle body 1 can be easily stopped and restarted by the operations related to the main clutch 19 and the brake 47.

In addition, the operation position of the operation arm 122 is set to a position where the operation arm 122 is in contact with the free end side of the guidance operation tool 11 from which the free end side of the operation arm 122 is switched to the lying down posture from above. When performing operations related to the main clutch 19 and the brake 47 against the urging of the springs 42 and 44, etc., from the dismounting position in front of the vehicle body during traveling over the saddle with 11 being switched to the lying down posture or unloading traveling The operation direction from the non-operation position of the operation arm 122 to the operation position can be the same as the pressing direction of the guidance operation tool 11 and the direction in which the force can be easily applied and the weight can be easily applied. The swing operation to the operation position of the operation arm 122 in which the operation load is heavier than the swing operation to the position can be easily performed. As a result, it is possible to improve the operability when the related operation of the main clutch 19 and the brake 47 is performed from the getting off position in front of the vehicle body.

  The guide operation tool 11 may be provided with a holding tool that enables the operation arm 122 to be engaged and held at the operation position. Further, the operation arm 122 may be configured so as to be able to switch and hold between the operation position and the non-operation position when the dead point is exceeded. Further, the operation arm 122 may be bent so that the free end thereof is directed laterally outward of the vehicle body 1 so that the swinging operation of the operation arm 122 across the non-operation position and the operation position is further facilitated. Good.

  As shown in FIGS. 1, 4, 11, and 14, the left end portion of the guidance operation tool 11 is linked to the linkage plate 72 of the linkage mechanism 69 for differential lock via the linkage rod 125. Yes. One end of the linkage rod 125 is engaged with an arc-shaped long hole 72B formed in the linkage plate 72 with the cam shaft 73 as the center. The long hole 72B is configured so that the cam shaft 73 is rotationally displaced from the differential position toward the differential stop position in conjunction with the swinging operation of the guide operation tool 11 from the standing posture to the lying posture. It is formed so as to allow the rotational displacement from the differential position of the cam shaft 73 to the differential stop position when the operation tool 11 is switched to the standing posture.

  With this configuration, in the differential device 24, when the guide operation tool 11 is switched from the standing posture to the lying posture, the cam shaft 73 is rotationally displaced from the differential position to the differential stop position, and resists the action of the spring 68. When the shift claw 67 is engaged with the engagement claw 62A, the differential state is switched to the differential stop state. When the guide operation tool 11 is switched from the lying posture to the standing posture, the cam shaft 73 is rotationally displaced from the differential stop position to the differential position, and the shift claw 67 is separated from the engagement claw 62A by the action of the spring 68. Thus, the differential stop state is switched to the differential state.

  In other words, when the guidance operation of the vehicle body 1 from the disembarking position in front of the vehicle body performed by switching the guidance operation tool 11 to the lying posture, the differential device 24 is switched to the operation stop state. Due to the action of the moving device 24, it is possible to avoid the possibility that one of the front wheels 8 slips due to being muddy.

  As shown in FIGS. 1 to 4, 9, 12, and 14, an auxiliary lever 126 (an example of the auxiliary operation tool D) is provided on the right side of the guidance operation tool 11 with a horizontal axis as a fulcrum. It is equipped so that it can be swung. The auxiliary lever 126 is urged to swing away from the free end portion of the guidance operating tool 11 toward the vehicle body by the action of a spring 127 provided on the swing fulcrum portion. In addition, the detent arm 117 of the detent mechanism 84 for work operation is linked via a linkage wire 128. When the auxiliary lever 126 is swung toward the free end portion of the guidance operation tool 11 against the action of the spring 127, the linkage wire 128 is linked to the operation to detent mechanism 84 for work operation. The auxiliary lever 126 and the detent arm 117 are linked so that the detent arm 117 is prevented from swinging in the engagement direction due to the action of the spring 118.

  That is, when the auxiliary lever 126 is swung toward the free end portion of the guidance operation tool 11 against the action of the spring 127, the operation lever 17 by the detent mechanism 84 for work operation is interlocked with the operation. The position holding is released, and the operation of the operation lever 17 to the raised position by the action of the hydraulic damper 83 is performed. Thereby, when the seedling planting device 4 and the fertilizer application device 5 are operating, their operation can be stopped in conjunction with the operation. Further, when the seedling planting device 4 has not reached the predetermined upper limit position, the seedling planting device 4 can be raised toward the predetermined upper limit position in conjunction with the operation.

As a result, during the above-mentioned crossing and unloading traveling, the slope of the saddle slope and the walking board that the vehicle body 1 travels is tighter than expected. When there is a possibility that the seedling planting device 4 that has been lifted in advance in consideration of the above will come into contact with the heel slope or the walking board, the auxiliary lever 126 is swung toward the free end of the guidance operation tool 11 By doing so, the seedling planting apparatus 4 can be raised toward a predetermined upper limit position. Thus, while avoiding the risk that the seedling planting apparatus 4 is brought into contact with the running surface such as the ground or running board in advance, it is possible to perform the unloading for such cargo loading and unloading and trucks for the field of the vehicle body 1 smoothly.

  In addition, at the end of the planting operation, seedling planting by the seedling planting device 4 is carried out while the vehicle body 1 is being climbed on the slope, in order to perform planting of the seedling by the seedling planting device 4 and fertilization by the fertilizer device 5 to the end. And the fertilizer application device 5 to continue planting, the seedlings are prevented from being lifted by the lower side of the guidance operation tool 11 while preventing the vehicle body front side from being lifted by a downward slope. As the planting device 4 reaches the heel, by swinging the auxiliary lever 126 toward the free end of the guidance operation tool 11, before the seedling planting device 4 reaches the heel slope, While maintaining the traveling of the vehicle body 1, the seedling planting device 4 and the fertilizer application device 5 can be stopped, and the seedling planting device 4 can be levitated toward a predetermined upper limit position. Thereby, while the unnecessary operation | movement of the seedling planting apparatus 4 and the fertilizer application apparatus 5 can be blocked | prevented, the possibility that the seedling planting apparatus 4 may contact a cocoon can be avoided beforehand. As a result, the vehicle body 1 can be smoothly escaped from the field while the planting is performed well.

[Second Embodiment]

  Hereinafter, as an example of the best mode for carrying out the present invention, a second embodiment in which the operation structure of an agricultural work vehicle according to the present invention is applied to a riding rice transplanter which is an example of an agricultural work vehicle is described with reference to the drawings. explain.

  In addition, this 2nd Embodiment is compared with 1st Embodiment mentioned above, the operation structure regarding the raising / lowering of the seedling planting apparatus 4 from the alighting position ahead of a vehicle body, the operating state of the seedling planting apparatus 4 and the fertilizer application apparatus 5 Since the operation structure related to switching and the operation structure for the main clutch 19 and the brake 47 are different, only those operation structures will be described below.

  As shown in FIGS. 15 to 17, the clutch / brake pedal 15 is connected to an operation arm 130 extending toward the front of the vehicle body 1. That is, by using the operation arm 130, the related operation of the main clutch 19 and the brake 47 can be easily performed from the getting-off position (ground side) in front of the vehicle body, similar to the operation of the clutch / brake pedal 15 in the boarding operation unit 16. It can be done.

  The operating arm 130 is equipped with an engaged member 131 that is bent in a U-shape. At a position on the vehicle body front side of the clutch / brake pedal 15 in the vehicle body 1 and on the vehicle body inward side of the operation arm 130, a lock lever 132 is provided from both the boarding operation unit 16 and the vehicle exit position in front of the vehicle body. It is arranged so that it can swing in the left-right direction. The lock lever 132 is oscillated and biased by a spring 133 in a direction away from the operation arm 130. The lock lever 132 can be engaged with the engaged member 131 when the operation arm 130 is swung downward from the non-operation position toward the operation position. A hook-like engaging portion 132A that holds the operating arm 130 in the operating position together with the pedal 15 is formed.

  With this configuration, by engaging the engaging portion 132A of the lock lever 132 with the engaged member 131 of the operation arm 130, the main clutch 19 can be kept in the disengaged state and the brake 47 can be kept in the braking state. The vehicle body 1 can be maintained in the travel stop state. Further, in the travel stop state, by disengaging the engaging portion of the lock lever 132 and the engaged member 131 of the operation arm 130, the main clutch 19 is brought into the engaged state and the brake 47 is not braked. The vehicle body 1 can be restarted by switching to the state.

  That is, as a matter of course, the boarding operation unit 16 can easily perform the stop operation and the restart operation of the vehicle body 1 even from the position of getting off the vehicle body.

  The operation structure for the main clutch 19 and the brake 47 using the operation arm 130 may be employed in the first embodiment described above. Further, the operation structure for the main clutch 19 and the brake 47 from the getting-off position in front of the vehicle body exemplified in the first embodiment may be adopted in the second embodiment.

  As shown in FIG. 15 and FIG. 18, the left side of the guidance operation tool 11 is an auxiliary that is arranged so as to be able to swing in the internal space of the guidance operation tool 11 bent in an arch shape. A lever 134 (an example of the auxiliary operation tool D), and a detent mechanism (not shown) or the like that enables operation to be held at the operation positions of the ascending position, the neutral position, the descending position, and the planting position of the auxiliary lever 134; A friction type holding mechanism (not shown) is provided.

  The auxiliary lever 134 is linked via a push-pull wire 135 to a swinging member 77 that is also used as a planting transmission linkage mechanism 76 and a planting lifting first linkage mechanism 99. The pull direction of the push-pull wire 135 is such that the auxiliary lever 134 swings from the planting position toward the raised position, and the auxiliary lever 134 is moved to the raised position, neutral position, lowered position, The auxiliary lever 134 and the swing member 77 are linked so that the operation lever 17 for operation is located at the operation position corresponding to the operation position when the operation lever 17 is positioned at each operation position of the planting position.

As a result, during the above-mentioned crossing and unloading traveling, the slope of the saddle slope and the walking board on which the vehicle body 1 travels is tighter than expected. When there is a possibility that the seedling planting device 4 that has been lifted in advance in consideration of the walking board or the like may come into contact with the heel slope or the walking board, it is re-recognized by operating the auxiliary lever 134 at that time. The seedling planting device 4 can be easily lifted and stopped at an appropriate height position according to the slope of the heel slope or the walking board. As a result, it is possible to avoid the possibility that the seedling planting device 4 will come into contact with a running surface such as the ground or a walking board. Moreover, compared with the case where the seedling planting apparatus 4 is raised to the upper limit position, the position of the center of gravity of the vehicle body 1 can be lowered, and the stability of the vehicle body 1 can be ensured.

  Furthermore, the seedling planting device 4 suppresses the lifting of the front side of the vehicle body, which is likely to occur due to the climbing of the vehicle body 1, by pressing down the guidance operation tool 11 during the above-described planting traveling. By operating the auxiliary lever 134 as it reaches the heel, the seedling planting device 4 and the fertilizer application device 5 are maintained while maintaining the traveling of the vehicle body 1 before the seedling planting device 4 reaches the heel slope. Can be stopped, and the seedling planting device 4 can be easily lifted and stopped at an appropriate height according to the gradient of the heel slope. Thereby, unnecessary operation | movement of the seedling planting apparatus 4 and the fertilizer application apparatus 5 can be prevented, and the possibility that the seedling planting apparatus 4 may come into contact with the cocoon can be avoided. As a result, the vehicle body 1 can be smoothly escaped from the field while the planting is performed well.

  Further, in this configuration, by arranging the auxiliary lever 134 in the internal space of the guidance operation tool 11 formed to be bent in an arch shape, it is possible to suppress the possibility that the auxiliary lever 134 may come into contact with another object or be caught. .

  Note that the auxiliary lever 134 may be linked to the swing member 77 via a rod, a swing arm, or the like.

[Third Embodiment]

  Hereinafter, as an example of the best mode for carrying out the present invention, a third embodiment in which the operation structure of an agricultural work vehicle according to the present invention is applied to a riding rice transplanter, which is an example of an agricultural work vehicle, based on the drawings. explain.

  In addition, this 3rd Embodiment is the operation structure regarding raising / lowering of the seedling planting apparatus 4 from the dismounting position ahead of a vehicle body, and the seedling planting apparatus 4 and the fertilizer application apparatus 5 with respect to 2nd Embodiment mentioned above. Since the operation structure relating to switching of the operating state is different, only those operation structures will be described below.

  As shown in FIG. 19, the guide operation tool 11 includes a pair of left and right auxiliary levers 136, which are arranged so as to be able to swing in the internal space of the guide operation tool 11 bent in an arch shape. 137 (an example of the auxiliary operation tool D), a neutral return mechanism (not shown) that urges the left auxiliary lever 136 to return to the neutral position, and a planting position and a planting stop position of the right auxiliary lever 137. A detent mechanism (not shown) or a friction-type holding mechanism (not shown) that enables operation holding in the operation position is provided.

  In the left auxiliary lever 136, the operation position located on the free end side of the guidance operation tool 11 with respect to the neutral position is the ascending position, and the operation position located on the base end side of the guidance operation tool 11 with respect to the neutral position is the descent position. The operation position is set so that

  The left auxiliary lever 136 is linked to the lifting / lowering swinging plate 100 via a first linkage wire 138. The right auxiliary lever 137 is linked to a first swinging plate 79 for planting transmission via a second linkage wire 139. The first linkage wire 138 is connected to the left auxiliary lever 136 and the lift lever 97 so that the spool 98 of the lift valve 97 can be slid by the left auxiliary lever 136 via the swing plate 100 for lift. The swing plate 100 is linked. The second linkage wire 139 can be operated to slide the operation pin 75 of the planting clutch 28 and the shift claw 88 of the fertilizer clutch 30 through the first swinging plate 79 for planting transmission and the like by the auxiliary lever 137 on the right side. Thus, the right auxiliary lever 137 and the first swing plate 79 for planting transmission are linked.

As a result, during the above-mentioned crossing and unloading traveling, the slope of the saddle slope and the walking board on which the vehicle body 1 travels is tighter than expected. If there is a possibility that the seedling planting device 4 that has been lifted in advance taking into consideration the walking board or the like will come into contact with the heel slope or the walking board, the left auxiliary lever 136 may be operated to restart it. The seedling planting device 4 can be easily lifted and stopped at an appropriate height position corresponding to the recognized slope of the heel slope or the walking board. As a result, it is possible to avoid the possibility that the seedling planting device 4 will come into contact with a running surface such as the ground or a walking board. Moreover, compared with the case where the seedling planting apparatus 4 is raised to the upper limit position, the position of the center of gravity of the vehicle body 1 can be lowered, and the stability of the vehicle body 1 can be ensured.

  Further, when traveling at the end of the above-described operation, the left auxiliary operating tool is prevented from being lifted by the lower side of the guidance operating tool 11 while preventing the lifting of the front side of the vehicle, which is likely to occur due to the climbing of the vehicle body 1. By operating 136, while the seedling planting device 4 and the fertilizer application device 5 are operated, as the posture of the vehicle body 1 changes in the forward upward direction due to the climbing of the vehicle body 1, an appropriate amount corresponding to the change amount is obtained. It is possible to raise the seedling planting device 4 by the raising operation amount. Thereby, it is possible to avoid the possibility that the seedling planting device 4 will sink due to the climbing of the vehicle body 1 at the end of the work and the seedling planting depth will fluctuate. As a result, it is possible to improve the planting accuracy at the time of running after the work.

  In addition, when the seedling planting device 4 reaches the heel at the end of the work, the right auxiliary lever 137 is operated so that the seedling planting device 4 reaches the heel slope before it reaches the heel slope. 1, the seedling planting device 4 and the fertilizer application device 5 can be deactivated, and by operating the left side auxiliary lever 136 after the operation, an appropriate value corresponding to the slope of the heel slope can be obtained. The seedling planting device 4 can be easily raised and stopped at the height position. Thereby, unnecessary operation | movement of the seedling planting apparatus 4 and the fertilizer application apparatus 5 can be prevented, and the possibility that the seedling planting apparatus 4 may come into contact with the cocoon can be avoided. As a result, the vehicle body 1 can be smoothly escaped from the field while the planting is performed well.

  In the third embodiment, instead of the neutral return mechanism, a detent mechanism (not shown) that enables operation to be held at the operating position of the left auxiliary lever 136 at the raised position, the neutral position, and the lowered position. ) Or a frictional holding mechanism (not shown).

  Further, the operation structure for the main clutch 19 and the brake 47 from the getting-off position in front of the vehicle body exemplified in the first embodiment may be adopted.

[Another embodiment]

[1] The operation structure of an agricultural work vehicle according to the present invention may be applied to a tractor that is an example of an agricultural work vehicle.

[2] As a riding rice transplanter, the rear part of the vehicle body 1 may be equipped with only the seedling planting device 4, or may be equipped with a chemical spraying device instead of the fertilizer application device 5. .

[3] The working device A may be a direct sowing device, a rotary tiller, or a spraying device that sprays fertilizer or chemicals while floating from the ground. In addition, when equip | installing a spreading | diffusion apparatus, for example, it is equipped with the intermittent mechanism B which enables the intermittent connection of the motive power with respect to the spreading | diffusion apparatus A, and the operation switch of the operating state of the intermittent mechanism A from the ground side is performed to the guidance operation tool 11. Auxiliary operating tool D is provided, and the traveling of the vehicle body 1 is maintained by operating the auxiliary operating tool D as the spraying device A reaches the heel when traveling at the end of work. The operation of the spraying device A may be stopped before the spraying device A reaches the slope.

[4] The fertilizer application device 5 may be configured as a rear mount type equipped at the rear part of the seedling planting device 4.

[5] The working device A may be one that is driven by electric power from a battery, a generator, or the like installed in the vehicle body 1. In this case, the interruption mechanism B is configured by a switch that enables the electric power to be supplied to the work device A.

[6] Various changes can be made to the structure of the lifting mechanism C. For example, the elevating mechanism C may be composed of an elevating drive hydraulic motor configured to be able to switch between forward and reverse, and an elevating valve that switches the flow of hydraulic oil to the hydraulic motor. You may comprise the comprised electric motor for a raising / lowering drive, and the switch which switches the electric power supply state with respect to this electric motor.

[7] The auxiliary lever 126 according to the first embodiment, which is linked to the guidance operating tool 11 as the auxiliary operating tool D via the connecting wire 128 to the detent arm 117 of the detent mechanism 84 for operation, The auxiliary lever 136 described in the third embodiment may be provided so as to be linked to the swing plate 100 for use via the first linkage wire 138.

[8] Linking to the guide operation tool 11 via the push-pull wire 135 to the swinging member 77 serving as the auxiliary operation tool D as the auxiliary operation tool D and the first linkage mechanism 99 for raising and lowering the planting. The auxiliary lever 134 described in the second embodiment and the auxiliary lever 136 described in the third embodiment linked to the swinging plate 100 for raising and lowering via the first linkage wire 138 are provided. You may comprise.

[9] The guidance operation tool 11 may be configured to be equipped with only one of the left and right auxiliary levers 136 and 137 described in the third embodiment as the auxiliary operation tool D.

[10] The auxiliary lever 126 illustrated in the first embodiment may be configured to be swung within the internal space of the guidance operation tool 11 formed in an arch shape.

[11] As shown in FIG. 20, the auxiliary operation tool D may be bent in an arch shape along the free end portion of the guidance operation tool 11. When the auxiliary operation tool D is formed in this way, when it is necessary to operate the auxiliary operation tool D in the above-described travel over the heel, loading and unloading, or traveling after planting, either the left or right hand is used. The auxiliary operation tool D can be easily operated without difficulty by a hand that can easily operate the auxiliary operation tool D.

[12] The auxiliary operation tool D may be directly linked to either one or both of the intermittent mechanism B and the lifting mechanism C via a dedicated linkage mechanism.

[13] The guidance operation tool 11 may be one that is fixedly mounted on the front portion of the vehicle body 1 so as not to be displaced. In addition, the vehicle body 1 is slid in the front-rear direction of the vehicle body over the front position of the vehicle body 1 over the retracted position where the extension length to the front of the vehicle body is minimum and the operation position where substantially the whole extends toward the front of the vehicle body 1. It may be configured to be operated dynamically.

[14] Various changes can be made to the shape of the guidance operation tool 11. For example, the guidance operation tool 11 may be formed in a straight line shape or a T-shape including a left-right holding portion at the free end portion thereof.

[15] An air damper, a spring or the like may be employed as the urging means 83.

[16] The holding means 84 may be of a friction type and configured to release the operation holding of the operation lever 17 by releasing the pressure contact with the friction plate by operating the auxiliary operation tool D.

Overall side view of riding rice transplanter Overall plan view of the riding rice transplanter Front view of riding rice transplanter A longitudinal side view of the main part showing the configuration of the front part of the vehicle body Schematic plan view showing transmission configuration Partial rear view of the transmission case Cross-sectional plan view of main parts showing clutch / brake operation structure Longitudinal side view of the main part showing the operation structure of the main transmission Longitudinal front view of the main part showing the operation structure A longitudinal side view of the main part showing the operation structure of the differential lock mechanism Cross-sectional plan view of the main part showing the operation structure of the diff lock mechanism Longitudinal side view of the main part showing the operating structure of the work system Cross-sectional plan view of the main part showing the operation structure of the work system Longitudinal side view of the main part showing the operation structure from the guidance operation tool side Front view of the riding rice transplanter showing the configuration of the auxiliary operation tool in the second embodiment Longitudinal side view of main part showing clutch / brake operation structure in second embodiment The top view of the principal part which shows the operation structure of the clutch and brake in 2nd Embodiment Operation linkage diagram showing the operation structure from the guidance operation tool side in the second embodiment Operation linkage diagram showing an operation structure from the guidance operation tool side in the third embodiment Front view of the riding rice transplanter showing the shape of the auxiliary operation tool in another embodiment

DESCRIPTION OF SYMBOLS 1 Car body 7 Boarding operation part 11 Guidance operation tool 17 Operation lever 83 Biasing means 84 Holding means A Work apparatus B Intermittent mechanism C Lifting mechanism D Auxiliary operation tool

Claims (3)

An operation structure of an agricultural work vehicle equipped with a work device at the rear of the vehicle body, and provided with a guidance operation tool enabling guidance of the vehicle body from the ground side at the front of the vehicle body,
An elevating mechanism that enables elevating drive of the working device, and an interrupting mechanism that enables intermittent power to the working device,
In the boarding operation part formed on the vehicle body, an operation lever for work that enables switching operation of the operating state of the lifting mechanism and the intermittent mechanism is provided,
An urging means for urging the operation lever toward an operation position where the interrupting mechanism is in a shut-off state and the lifting mechanism is in an ascending state, and operation of the operation lever against the action of the urging means Holding means for enabling holding,
An operation structure for an agricultural work vehicle, wherein the guide operation tool is equipped with an auxiliary operation tool that enables a holding release operation of the holding means from the ground side. An operation structure of an agricultural work vehicle equipped with a work device at the rear of the vehicle body, and provided with a guidance operation tool enabling guidance of the vehicle body from the ground side at the front of the vehicle body,
An elevating mechanism enabling the elevating drive of the working device;
The guidance operation tool is equipped with an auxiliary operation tool that enables switching of the operating state of the lifting mechanism from the ground side so as to be able to swing in the internal space of the guidance operation tool. An operation structure of an agricultural work vehicle characterized by being. An operation structure of an agricultural work vehicle equipped with a work device at the rear of the vehicle body, and provided with a guidance operation tool enabling guidance of the vehicle body from the ground side at the front of the vehicle body,
Comprising an interrupting mechanism that enables interrupting of power to the working device;
The guidance operation tool is equipped with an auxiliary operation tool that enables a switching operation of the interrupting mechanism from the ground side so that a swing operation in the internal space of the guidance operation tool is possible. An operation structure of an agricultural work vehicle characterized by being.

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