JP6109008B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle such as a tractor for agricultural work or a wheel loader for civil engineering work.

  Conventionally, in a tractor as a work vehicle, a plurality of work systems for setting and adjusting a work state of a traveling machine body and a rotary tiller on an upper surface of an armrest disposed on at least one of left and right sides of a control seat There is one in which operation means are arranged together. An example of such a tractor is disclosed in Patent Document 1. In the tractor of Patent Document 1, a work implement lifting lever (working unit position lever), which is a work system operating means, is arranged on an armrest located on the right side in the traveling direction of the control seat, and is located outside the armrest with respect to the control seat. Is provided with a throttle lever (main transmission lever) which is a traveling system operation means.

JP 2008-037411 A

  However, in the configuration of Patent Document 1, since the traveling system operation means is disposed at a position away from the control seat, it is necessary to move the hand greatly from the steering whenever the traveling speed of the work vehicle is changed. The nature was bad. Further, although the work system operation means is arranged on the armrest, the traveling system operation means is arranged outside the armrest. Therefore, the operator needs to move at least the front from the elbow when operating the traveling system operation means, and the armrest may be an obstacle depending on the operation posture.

  In view of the above problems, the present invention aims to ensure that the function of the armrest (the function of resting on the arm) is also maintained with the operator's hand easily reaching various operating means. It is what.

The present invention is configured to shift power from an engine mounted on a traveling machine body by a hydraulic continuously variable transmission and transmit the power to a traveling unit and a working unit, and an armrest for placing an operator's arms and hands Is a work vehicle disposed on the side of the control seat in the traveling aircraft body, wherein a main transmission lever for shifting the traveling speed by the traveling unit is disposed on the control seat side at the front end of the armrest, while the armrest An elevating dial that raises and lowers the working portion is disposed on a side surface that is opposite to the control seat, and the elevating dial is fitted to the side surface of the armrest so that the upper end of the elevating dial is lower than the upper surface of the armrest The side of the armrest is laterally cut for dial operation on the upper side of the lifting dial installation area. A rotation restricting portion for restricting rotation of the elevating dial by providing an operating projection above the elevating dial and contacting the stepped portions before and after the side notch with the operating projection. It is composed .

In the work vehicle, the main transmission lever may protrude from the front side of the armrest on the side of the control seat, and a front surface of the armrest may be configured with a curved surface corresponding to a turning locus of the main transmission lever.

In the work vehicle, a rear portion of the armrest may be configured in parallel with the control seat, while a front portion of the armrest may be configured to be separated from the control seat toward a front end.

In the work vehicle, on the upper surface of the armrest, a setting dial for setting the maximum speed of the traveling speed or the maximum engine speed at a position behind the main transmission lever and on the side of the control seat If, or as a set value by the setting dial is arranged and a selection switch for alternatively selected whether it is a maximum speed of the maximum speed and the engine of the running speed.

  According to the present invention, the main shift lever for shifting the traveling speed of the traveling portion is arranged on the side of the control seat at the front end of the armrest, while the elevating dial for raising and lowering the working portion is arranged on the side surface on the opposite side of the control seat in the armrest. Therefore, the arrangement positions of the travel system operation means and the work system operation means are close to the operator, and the operability of the travel system operation means and the work system operation means is good. The main shift lever of the traveling system operating means is a lever-type operating tool, while the lifting dial of the working system operating means is a dial-type operating tool so that the operator can operate the work vehicle even when operating the work vehicle. The traveling system operation means and the work system operation means can be easily identified, and erroneous operation can be prevented.

  Also, a main speed change lever projects from the control seat side of the front end of the armrest, and the front surface of the armrest is configured with a curved surface corresponding to the turning locus of the main speed change lever. The operator's hand holding the) does not come into contact with the armrest, so that the operator can smoothly operate the main transmission lever.

  In addition, the lifting / lowering dial is placed on the side of the armrest so that the upper end of the lifting / lowering dial is lower than the upper surface of the armrest. In addition to providing a notch, an operation protrusion is provided above the elevating dial, and the step part before and after the side notch is brought into contact with the operation protrusion to constitute a rotation restricting part that restricts the rotation of the elevating dial. Therefore, it is possible not only to prevent accidental touching of the elevating dial when operating the main speed change lever, but also when operating the elevating dial, the rotation area can be restricted by a specified width, and excessive operation can be prevented.

  Further, by configuring the rear part of the armrest in parallel with the control seat and configuring the front part of the armrest to be separated from the control seat toward the front end, the operability of the traveling system operation means and the work system operation means is achieved. While being excellent in (handleability), there is an effect that the operator's arm can be accurately supported or configured not to hit the knee.

  Further, on the upper surface of the armrest, a setting dial for setting the maximum speed of the traveling speed or the maximum engine speed at a position behind the main shift lever and on the side of the control seat, and a setting value by the setting dial Since a selection switch that selectively selects either the maximum speed of the traveling speed or the maximum rotational speed of the engine is disposed, the traveling system operation means is on the side closer to the operator of the control seat. Since the main transmission lever, setting dial, and selection switch are arranged together, the operability (handleability) is excellent.

It is a left view of a tractor. It is a top view of a tractor. It is a block diagram which shows the outline of a power transmission system. It is a functional block diagram of a controller. It is a top view of a cabin. It is a left view in a cabin. It is a top view of an armrest. It is a left view of an armrest. It is a right view of an armrest. It is a left view of the armrest used as another example.

  Hereinafter, an embodiment in which the present invention is applied to a tractor as a work vehicle will be described with reference to the drawings (FIGS. 1 to 13). 1 is a left side view of the tractor, FIG. 2 is a plan view of the tractor, FIG. 3 is a block diagram showing an outline of a power transmission system, FIG. 4 is a functional block diagram of a controller, FIG. 5 is a plan view of a cabin, and FIG. 7 is a plan view of the armrest, FIG. 8 is a left side view of the armrest, and FIG. 9 is a right side view of the armrest. In FIG. 2, the cabin is not shown for convenience.

  First, an outline of the tractor will be described with reference to FIGS. 1 and 2. The traveling machine body 2 of the tractor 1 in the embodiment is supported by a pair of left and right rear wheels 4 as well as a pair of left and right front wheels 3 as a traveling unit. By driving the rear wheel 4 and the front wheel 3 with a common rail type diesel engine 5 (hereinafter simply referred to as an engine) as a power source mounted on the front part of the traveling machine body 2, the tractor 1 travels forward and backward. It is configured. The engine 5 is covered with a bonnet 6. A cabin 7 is installed on the upper surface of the traveling machine body 2. Inside the cabin 7, a steering seat 8 and a steering handle (round handle) that moves the steering direction of the front wheel 3 to the left and right by steering. 9 are arranged. A fuel tank 11 that supplies fuel to the engine 5 is provided below the bottom of the cabin 7.

  In the engine room covered with the bonnet 6, the exhaust side of the engine 5 is connected to a continuously regenerative exhaust gas purification device 50 (diesel particulate filter). The exhaust gas purifying device 50 is a soot having a honeycomb structure that continuously oxidizes and removes particulate particulate matter (hereinafter referred to as PM) at a relatively low temperature, such as a diesel oxidation catalyst such as platinum that generates nitrogen dioxide (NO 2). And a filter. That is, the exhaust gas purification device 50 has a configuration in which a diesel oxidation catalyst and a soot filter are arranged in series in the movement direction of the exhaust gas inside the cylindrical purification casing, and the PM in the exhaust gas of the engine 5 is arranged. In addition to removal, it is configured to reduce carbon monoxide (CO) and hydrocarbons (HC) in the exhaust gas.

  The traveling machine body 2 includes an engine frame 14 having a front bumper 12 and a front axle case 13, and left and right machine body frames 16 that are detachably fixed to the rear portion of the engine frame 14 with bolts. A mission case 17 is mounted on the rear part of the machine body frame 16 to transmit the rotational power from the engine 5 to the front and rear four wheels 3, 3, 4, 4 as appropriate. The rear wheel 4 is attached to the mission case 17 via a rear axle case 18 mounted so as to protrude outward from the outer surface of the mission case 17. Upper portions of the left and right rear wheels 4 are covered with a fender 19 fixed to the body frame 16.

  On the rear upper surface of the mission case 17, a hydraulic lifting mechanism 20 for lifting and lowering the rotary tiller 15 as a working unit is detachably attached. The rotary cultivator 15 is connected to the rear portion of the mission case 17 via a three-point link mechanism including a pair of left and right lower links 21 and a top link 22. On the rear side surface of the mission case 17, a PTO shaft 23 for transmitting a PTO driving force to the rotary cultivator 15 protrudes backward.

  As shown in FIG. 3, a flywheel 25 is attached to an engine output shaft 24 projecting rearward on the rear side surface of the engine 5 so as to be directly connected. A main drive shaft 26 that is connected to the flywheel 25 via the main clutch 140 and extends rearward is a main transmission input shaft 27 that protrudes forward from the mission case 17, and a telescopic type shaft that has universal joints at both ends. It is connected via a power transmission shaft 28. On the other hand, as shown in FIG. 1, a front wheel transmission shaft (not shown) protruding rearward from the front axle case 13 and a front wheel output shaft (not shown) protruding forward from the front side surface of the mission case 17 Are connected via a front wheel drive shaft 85.

  In the mission case 17, a hydraulic continuously variable transmission 29, a forward / reverse switching mechanism 30, a traveling auxiliary transmission gear mechanism 31, and a differential gear mechanism 58 are disposed. The rotational power of the engine 5 is transmitted to the main transmission input shaft 27 of the transmission case 17 via the power transmission shaft 28, and then appropriately shifted by the hydraulic continuously variable transmission 29 and the traveling auxiliary transmission gear mechanism 30. The This speed change power is transmitted to the left and right rear wheels 4 via the differential gear mechanism 58. Further, the transmission power described above is transmitted to the front axle case 13 via the front wheel drive shaft 85, so that it is also transmitted to the left and right front wheels 3.

  The hydraulic continuously variable transmission 29 is an in-line system in which a main transmission output shaft 36 is concentrically arranged on a main transmission input shaft 27, and a variable displacement hydraulic pump unit 150 and a discharge from the hydraulic pump unit 150. And a constant displacement type hydraulic motor unit 151 for transmission that is operated by a high-pressure hydraulic oil. The hydraulic pump unit 150 is provided with a pump swash plate 159 that can change the inclination angle with respect to the axis of the main transmission input shaft 27 and adjust the amount of hydraulic oil supplied thereto. The pump swash plate 159 is associated with a main transmission hydraulic cylinder that changes and adjusts the inclination angle of the pump swash plate 159 with respect to the axis of the main transmission input shaft 27. By changing the tilt angle of the pump swash plate 159 by driving the main transmission hydraulic cylinder (not shown), the amount of hydraulic oil supplied from the hydraulic pump unit 150 to the hydraulic motor unit 151 is changed and adjusted. The main transmission operation of the continuously variable transmission 29 is performed.

  That is, when a switching valve (not shown) is operated by hydraulic oil from a proportional control valve 123 (see FIG. 4) that operates in proportion to an operation amount of a main transmission lever 290 (details will be described later), it is not shown. The main transmission hydraulic cylinder is driven, and accordingly, the inclination angle of the pump swash plate 159 with respect to the axis of the main transmission input shaft 27 is changed. The pump swash plate 159 of the embodiment is angle-adjusted in a range between one (positive) maximum inclination angle and the other (negative) maximum inclination angle with a neutral angle of substantially zero inclination (before and after that including zero) interposed therebetween. This is possible and is set to be an angle inclined to one of the traveling vehicle bodies 2 when the vehicle speed is the lowest (in this case, an inclination angle that is negative and near the maximum).

  When the inclination angle of the pump swash plate 159 is substantially zero (neutral angle), the hydraulic motor unit 151 is not driven by the hydraulic pump unit 150 and the main transmission output shaft 237 is rotated at substantially the same rotational speed as the main transmission input shaft 27. Rotates. When the pump swash plate 159 is inclined in one direction (positive inclination angle) with respect to the axis line of the main transmission input shaft 27, the hydraulic pump unit 150 increases the speed of the hydraulic motor unit 151 to operate the main transmission input shaft. The main transmission output shaft 36 rotates at a rotational speed faster than 27. As a result, the rotational speed of the hydraulic motor unit 151 is added to the rotational speed of the main transmission input shaft 27 and transmitted to the main transmission output shaft 36. Therefore, in the range of the rotational speed higher than the rotational speed of the main transmission input shaft 27, the transmission power (vehicle speed) from the main transmission output shaft 36 is proportional to the inclination angle (positive inclination angle) of the pump swash plate 159. Be changed. When the pump swash plate 159 is positive and has an inclination angle near the maximum, the traveling machine body 2 reaches the maximum vehicle speed.

  When the pump swash plate 159 is tilted in the other direction (negative tilt angle) with respect to the axis of the main transmission input shaft 27, the hydraulic pump unit 150 operates the hydraulic motor unit 151 to decelerate (reverse) the main shift. The main transmission output shaft 36 rotates at a lower rotational speed than the input shaft 27. As a result, the rotational speed of the hydraulic motor unit 151 is subtracted from the rotational speed of the main transmission input shaft 27 and transmitted to the main transmission output shaft 36. Therefore, the transmission power from the main transmission output shaft 36 is changed in proportion to the inclination angle (negative inclination angle) of the pump swash plate 159 within the range of the rotation speed lower than the rotation speed of the main transmission input shaft 27. . When the pump swash plate 159 is negative and has an inclination angle near the maximum, the traveling machine body 2 has the lowest vehicle speed.

  The forward / reverse switching mechanism 30 receives rotational power from the main transmission output shaft 36 of the hydraulic continuously variable transmission 29. The forward / reverse switching mechanism 30 includes a forward gear (not shown) and a reverse gear (not shown) for switching forward and backward of the traveling machine body 2, and the forward gear is driven by a forward and reverse hydraulic clutch (not shown). Then, the reverse transmission gear 31 is selectively selected and rotated to transmit power to the auxiliary transmission mechanism 31. At this time, in the neutral state in which the forward / reverse switching lever 252 is not tilted and operated, both the forward and reverse hydraulic clutches (not shown) are in the power cut-off state. The rotational power from the main transmission output shaft 36 toward the front and rear wheels 3 and 4 is configured to be substantially zero (the same state as when the main clutch 140 is disengaged).

  Further, the forward clutch solenoid valve 46 (see FIG. 4) is driven by the forward side tilting operation of the forward / reverse switching lever 252 (see FIGS. 1 and 2) to operate the forward clutch cylinder (not shown). Thereby, the rotational power by the main transmission output shaft 36 is transmitted to the auxiliary transmission mechanism 31 via the forward gear (not shown) in the forward / reverse switching mechanism 30. On the other hand, the reverse clutch solenoid valve 48 (see FIG. 4) is driven by the reverse operation of the forward / reverse switching lever 252 to operate the reverse clutch cylinder (not shown). Thereby, the rotational power by the main transmission output shaft 36 is transmitted to the auxiliary transmission mechanism 31 via the reverse gear (not shown) in the forward / reverse switching mechanism 30.

  The auxiliary transmission mechanism 31 receives the rotational power from the forward / reverse switching mechanism 30 and shifts and outputs the rotational power via the forward / backward switching mechanism 30. The auxiliary transmission mechanism 31 includes a low-speed gear (not shown) and a high-speed gear (not shown) for auxiliary transmission, and the low-speed gear and the high-speed gear are connected by a low-speed clutch (not shown) and a high-speed clutch (not shown). By alternatively selecting and rotating, the rotational power from the forward / reverse switching mechanism 30 is shifted and transmitted to each subsequent mechanism.

  The position of the piston rod of the auxiliary transmission hydraulic cylinder (not shown) according to the switching operation of the high-speed clutch solenoid valve 136 (see FIG. 4) by the low-speed side tilting operation of the auxiliary transmission lever 258 (see FIGS. 1 and 2). Is moved to the low speed side. Accordingly, a sub-shift shifter (not shown) connected to the piston rod tip of the sub-transmission hydraulic cylinder (not shown) places the low-speed clutch (not shown) in the power connection state, and the rotation from the forward / reverse switching mechanism 30 is rotated. The power is shifted to a low speed and transmitted to the differential gear mechanism 58.

  On the other hand, the position of the piston rod of the sub-transmission hydraulic cylinder (not shown) is displaced to the high-speed side according to the switching operation of the high-speed clutch solenoid valve 136 (see FIG. 4) by the high-speed side tilting operation of the sub-transmission lever 258. Therefore, a sub shift shifter (not shown) places a high speed clutch (not shown) in a power connection state, shifts the rotational power from the forward / reverse switching mechanism 30 at a high speed, and the differential gear mechanism 58. To communicate.

  The differential gear mechanism 58 receives the rotational power from the auxiliary transmission mechanism 31 and transmits the transmission power changed by the auxiliary transmission mechanism 31 to the left and right rear wheels 4. At this time, the differential gear mechanism 58 distributes and transmits the transmission power changed by the auxiliary transmission mechanism 31 to the differential output shafts 62 extending in the left-right direction by a differential gear (not shown). Operation). The differential output shaft 62 is connected to the rear axle 64 via a final gear 63 and the like, and the rear wheel 4 is attached to the tip of the rear axle 64. The differential output shaft 62 is provided with brake operating mechanisms 65a and 65b in association with each other, and the brake operating mechanisms 65a and 65b are operated by depressing the brake pedal 251 (see FIG. 2) on the right side of the steering column 245. Is configured to perform a braking operation.

  Further, when the steering angle of the steering handle 9 (see FIGS. 1 and 2) exceeds a predetermined angle, a brake cylinder (not shown) is driven by driving an autobrake solenoid valve 67a (67b) corresponding to the rear wheel 4 inside the turn. ) Is activated, and the brake operation mechanism 65a (65b) for the rear wheel 4 inside the turn is configured to automatically perform a braking operation. For this reason, small turn turning such as U-turn can be executed. The differential gear mechanism 58 includes a differential lock mechanism (not shown) for stopping the differential operation (the left and right differential output shafts 62 are always driven at a constant speed). In this case, the differential pin is fixed and the differential function is stopped by engaging the differential pin with the differential gear by depressing the differential lock pedal 257 (see FIG. 2). The differential output shaft 62 is driven to rotate at a constant speed.

  Further, the transmission case 17 having the above-described configuration interrupts power transmission between the PTO transmission gear mechanism (not shown) for switching the driving speed of the PTO shaft 23 and the main transmission input shaft 27 and the PTO transmission gear mechanism. A PTO clutch (not shown) that can be used. The power from the engine 5 is transmitted to the PTO shaft 23 by the operations of the PTO transmission gear mechanism and the PTO clutch.

  In this case, when a PTO clutch switch 225 (described later) is turned on, the PTO clutch hydraulic solenoid valve 104 (see FIG. 4) is driven to bring a PTO clutch (not shown) into a power connection state. As a result, the rotational power from the engine 5 transmitted through the main transmission input shaft 27 is output toward the PTO shaft 23 from a PTO gear mechanism (not shown). At this time, when the PTO speed change lever 256 is operated to shift, a plurality of gears in a PTO speed change gear mechanism (not shown) are selectively rotated, so that each PTO speed change output of 1st to 4th speeds and reverse rotation is generated on the PTO shaft. 23.

  Next, a configuration for executing various controls (shift control, automatic horizontal control, tillage depth automatic control, etc.) of the tractor 1 will be described with reference to FIG. As shown in FIG. 4, the tractor 1 includes an engine controller 311 that controls the driving of the engine 5, a meter controller 312 that controls the display operation of the meter panel 246 mounted on the steering column (steering column) 245, and the speed of the traveling machine body 2. This machine controller 313 that performs control and the like, and a work machine controller 314 that performs state control and the like of the rotary tiller 15 are provided.

  Each of the controllers 311 to 314 includes a CPU for executing various arithmetic processes and controls, a ROM for storing control programs and data, a RAM for temporarily storing control programs and data, and a timer for measuring time And an input / output interface and the like, and are connected to each other via a CAN communication bus 315 so that they can communicate with each other. The engine controller 311 and the meter controller 312 are connected to the battery 202 via the power application key switch 201. The key switch 201 is a rotary switch that can be rotated with a predetermined key inserted into the keyhole, and is attached to a steering column 245 positioned in front of the control seat 8.

  On the input side of the engine controller 311, a rail pressure sensor 321 that detects the fuel pressure in the common rail of the engine 5, an engine rotation sensor 322 that detects the rotational speed of the engine 5 (camshaft position of the crankshaft), and cooling of the engine 5 A cooling water temperature sensor 323 for detecting the water temperature, a fuel temperature sensor 324 for detecting the fuel temperature in the common rail of the engine 5, and a difference for detecting the differential pressure of the exhaust gas before and after the soot filter (upstream and downstream) in the exhaust gas purification device 50 A pressure sensor 325 and a DPF temperature sensor 326 that detects the exhaust gas temperature in the exhaust gas purification device 50 are connected.

  Thereby, the engine controller 311 controls the fuel pump 327 and the fuel injection valve 328 of the engine 5. That is, fuel in a fuel tank (not shown) is pumped to a common rail (not shown) by a fuel pump 327 and stored in the common rail as high-pressure fuel. Each fuel injection valve 328 is controlled to open and close (electronic control), so that the high-pressure fuel in the common rail (not shown) is controlled with high accuracy in injection pressure, injection timing, and injection period (injection amount). Thus, the fuel is injected into each cylinder of the engine 5 from each injector (not shown). For this reason, nitrogen oxides (NOx) discharged from the engine 5 can be reduced, and noise vibration of the engine 5 can be reduced.

  On the input side of the meter controller 312, a steering potentiometer 210 that detects the amount of rotation (steering angle) of the steering handle 9, a display changeover switch 231 that switches the display on the liquid crystal panel 330, and an exhaust gas purification device 50 regeneration operation are permitted. A regeneration switch 329 as an input member is connected. Further, on the output side of the meter controller 312, the liquid crystal panel 330 in the meter panel 246, the alarm buzzer 331 that rings in relation to the regeneration operation of the exhaust gas purification device 50, and the regeneration operation of the exhaust gas purification device 50 are related. A regeneration lamp 332 is connected as a blinking warning lamp.

  On the input side of the machine controller 313, a forward / reverse potentiometer 211 that detects the operation position of the forward / reverse switching lever 252, a main transmission output shaft rotation sensor 212 that detects the output rotational speed of the main transmission output shaft 36, front and rear wheels 3, 4, a vehicle speed sensor 213 that detects the rotational speed (traveling speed) 4, a brake pedal switch 220 that detects whether the brake pedal 251 is depressed, an auto brake switch 221 that switches the auto brake solenoid valves 67 a and 67 b, and a main transmission lever 290. A main transmission potentiometer 222 for detecting the operation position, a rotation speed / vehicle speed setting dial 226, a rotation speed / vehicle speed selection switch 227, and a mode changeover switch 232 are connected.

  On the output side of the machine controller 313, a forward clutch solenoid valve 46 that operates a forward clutch cylinder (not shown), a reverse clutch solenoid valve 48 that operates a reverse clutch cylinder (not shown), and a sub-shift. A high-speed clutch solenoid valve 136 for operating a hydraulic cylinder (not shown), a proportional control valve 123 for operating a main transmission hydraulic cylinder (not shown) in proportion to the amount of tilting operation of the main transmission lever 290, Auto brake electromagnetic valves 67a and 67b for operating the brake operation mechanisms 65a and 65b are connected.

  On the input side of the work machine controller 314, a pendulum type rolling sensor 214 that detects the right and left inclination angle of the traveling machine body 2, and a potentiometer type working unit that detects the relative right and left inclination angle of the rotary tiller 15 with respect to the traveling machine body 2. A position sensor 215, a potentiometer type lift angle sensor 216 that detects a rotation angle of a lift arm (not shown) that connects the hydraulic lifting mechanism 20 and the left and right lower links 21, and a variation in tillage depth of the rotary tiller 15 A potentiometer-type rear cover sensor 217 for detecting the vertical rotation angle of the tilling rear cover 195 (see FIGS. 1 and 2) that rotates up and down, and a work unit position dial that manually changes and adjusts the height position of the rotary tiller 15 Position dial sensor 223 for detecting 300 operation positions, tilling depth setting dial 24, PTO clutch switch 225, tilt manual switch 228, the automatic lift switch 229, lifting the fine adjustment switch 230, the inclined setting dial 233, they are connected highest position setting dial 234, and the lowering speed setting dial 235.

  Working oil is supplied to the output side of the work machine controller 314 to a PTO clutch hydraulic solenoid valve 104 that operates a PTO clutch 100 (not shown) and a single-acting hydraulic cylinder (not shown) of the hydraulic lifting mechanism 20. A control solenoid valve 121 is connected.

  The control seat 8 and the surrounding structure will be described with reference to FIGS. A steering column 245 that surrounds the rear side of the engine 5 is disposed in front of the control seat 8 in the cabin 7. A steering handle 9 having a substantially round shape in plan view is attached to the upper end of a handle shaft that protrudes from the upper surface of the steering column 245. Therefore, the substantially annular steering wheel 247 in the steering handle 9 is inclined obliquely downward and rearward with respect to the horizontal.

  On the right side of the steering column 245, a throttle lever 250 for setting and maintaining the output rotational speed of the engine 5 and a pair of left and right brake pedals 251 for braking the traveling machine body 2 are disposed. On the left side of the steering column 245, a forward / reverse switching lever 252 for switching the traveling direction of the traveling vehicle body 2 between forward and reverse, a clutch pedal 253 for operating the main clutch 140 for power transmission and disconnection, and Is arranged. A parking brake lever 254 for holding the left and right brake pedals 251 in the depressed position is disposed on the rear side of the steering column 245.

  On the right side of the steering column 245 of the floor plate 248 in the cabin 7 is an accelerator pedal for accelerating / decelerating the engine speed in a range beyond this with the engine speed set by the throttle lever 250 as the minimum engine speed. 255 is arranged. Below the control seat 8 are a PTO speed change lever 256 for switching the drive speed of the PTO shaft 23, which will be described later, and a diff lock pedal 257 for executing an operation of rotating the left and right rear wheels 4 at a constant speed. Is arranged. An auxiliary transmission lever 258 for switching the output range of the traveling auxiliary transmission gear mechanism 30 (see FIG. 3) between a low speed and a high speed is disposed on the left side of the control seat 8.

  On the right side of the control seat 8, an armrest 259 for placing the arm and elbow of the operator seated on the control seat 8 is provided. The armrest 259 is configured separately from the control seat 8 and includes a main transmission lever 290 that is a travel system operation unit and a work unit position dial (elevating dial) 300 that is a work system operation unit. The main transmission lever 290 is provided so as to be able to tilt forward and backward as a main transmission operation body. In the present embodiment, the vehicle speed of the traveling machine body 2 increases when the main transmission lever 290 is tilted forward, while the vehicle speed of the traveling machine body 2 decreases when the main transmission lever 290 is tilted backward. The working unit position dial 300 is a dial type for manually changing and adjusting the height position of the rotary tiller 15.

  The rear end of the lower end of the armrest 259 is pivotally attached to a bracket (not shown) erected on a seat frame (not shown) or the like on which the control seat 8 is placed so as to be able to turn up and down (up and down). And can be flipped up. The armrest 259 is configured to be able to adjust the rotation posture by the undulation rotation in a plurality of stages (four stages in the embodiment). The armrest 259 may be configured to be position-adjustable (can be slid back and forth) along the traveling direction (front-rear direction) of the traveling machine body 2 independently of the front-rear slide of the control seat 8.

  By adopting the above-described structure capable of turning up and down, the turning posture of the armrest 259 can be adjusted stepwise according to the physique and working posture of the operator sitting on the control seat 8, so that the arm of the operator can be supported accurately. It can be set not to hit the knee. In addition, when the armrest 259 is configured to be able to adjust the front / rear slide position, combined with the front / rear slide position adjustment function of the control seat 8 and the configuration that allows the armrest 259 to turn up and down, the operator can reduce fatigue due to long-time work. It is effective.

  Further, on the right side of the armrest 259, an operation console 260 provided with various operation means is fixed above the fender 19. Further, a working depth setting dial 224, a PTO clutch switch 225, and a tilt manual switch 228 are arranged on the upper surface of the operation console 260. The tilling depth setting dial 224 is a dial type for presetting a target tilling depth of the rotary tiller 15. The PTO clutch switch 225 is for switching the power transmission from the PTO shaft 23 to the rotary tiller 15 by operating the PTO clutch 100 on and off. The tilt manual switch 228 is for manually changing and adjusting the left and right tilt angle of the rotary tiller 15.

  When the PTO clutch switch 225 is rotated clockwise in plan view while pressing the switch once, the PTO clutch switch 225 is locked at the pressed position, and the power transmission from the PTO shaft 23 to the rotary tiller 15 is brought into the connected state, and further pressed again. This is a push switch that returns to the original position and shuts off power transmission from the PTO shaft 23 to the rotary tiller 15. The tilt manual switch 228 is a self-returning (momentary) lever switch that tilts in the left-right direction, and the left-right tilt angle of the rotary tiller 15 changes only while the tilt manual switch 228 is being operated.

  The detailed structure of the armrest 259 will be described with reference to FIGS. The armrest 259 includes a base portion (armrest rear portion) 281 that is long in the front-rear direction and an extension portion (armrest front portion) 282 that extends forward from the base portion 281. The extension part 282 is arranged to be bent in a direction away from the control seat 8 (right direction in the embodiment) with respect to the base part 281 extending so as to be arranged in parallel with the control seat 8, and the armrest 259 as a whole is arranged. It has a substantially square shape in plan view.

  As shown in FIGS. 7 and 8, the armrest 259 has a front notch 283 that is recessed downward from the upper surface on the side of the control seat 8 at the front end of the extension 282, and the main speed change from the upper surface of the front notch 283. A lever 290 is projected. The extension part 282 has a step part 284 that is recessed downward from the upper surface on the control seat 8 side behind the front notch part 283 (on the connection side with the base part 281), and will be described later on the upper surface of the step part 284. A rotation speed / vehicle speed setting dial (setting dial) 226 and a rotation speed / vehicle speed selection switch (selection switch) 227 described later are arranged.

  Note that the height position of the upper surface of the stepped portion 284 is higher than the upper surface of the front notch 283 and lower than the upper surface of the base portion 281. As a result, even if the operator places his / her arm or elbow on the base 281 of the armrest 259 and operates the main transmission lever 290 in front of the extension 282, the setting dial 226 and the selection switch 227 on the step 284 The risk of inadvertent contact can be reduced. Accordingly, erroneous operation of the setting dial 226 and the selection switch 227 can be significantly reduced or prevented.

  The rotation speed / vehicle speed setting dial 226 is for presetting the maximum rotational speed of the engine 5 or the maximum traveling speed of the traveling machine body 2. The rotation speed / vehicle speed selection switch 227 is used for designating whether the value set by the rotation speed / vehicle speed setting dial 226 is the maximum rotation speed of the engine 5 or the maximum travel speed of the traveling machine body 2, and holds the position. It is composed of a type (alternate type) switch (in the example of this embodiment, a position holding type rocker switch). Thus, when the rotational speed is designated by the rotational speed / vehicle speed selection switch 227, the maximum rotational speed of the engine 5 is set by the rotational speed / vehicle speed setting dial 226. On the other hand, when the traveling speed is designated by the rotational speed / vehicle speed selection switch 227, the maximum traveling speed of the traveling machine body 2 is set by the rotational speed / vehicle speed setting dial 226.

  As shown in FIGS. 7 and 8, the base portion 281 of the armrest 259 has a switch box 286 embedded on the rear control seat 8 side. The upper surface of the switch box 286 includes an upper cover 287 that opens toward the opposite side of the control seat 8. That is, the upper surface cover 287 is pivotally supported at the edge on the opposite side of the control seat 8 so that the axial direction of the rotation axis is the longitudinal direction (front-rear direction) of the base 281. Therefore, when the top cover 287 is opened, the inside of the switch box 286 is opened from the control seat 8 side, and thus the operation from the operator seated on the control seat 8 is easy. Normally, the upper surface cover 287 is closed, the upper surface of the upper surface cover 287 is set to the upper surface height of the base 281 of the armrest 259, and the operator puts his arm or elbow on the upper surface cover 287.

  The switch box 286 is arranged so that its longitudinal direction is along the longitudinal direction of the base 281. The switch box 286 has an inclination setting dial 233, a highest raising position setting dial 234, and a lowering speed setting dial 235 on the inner upper surface facing the lower surface of the upper cover 287. That is, when the upper cover 287 is opened, the setting dials 233 to 235 are arranged in a line on the inner upper surface of the switch box 286. The inclination setting dial 233 is for setting in advance a target left / right inclination angle of the rotary tiller 15 relative to the traveling machine body 2. The highest rise position setting dial 234 is for setting the highest rise position of the rotary tiller 15. The lowering speed setting dial 235 is for the rotary tiller 15 to set the lowering speed of the rotary tiller 15 in order to reduce the impact when the rotary tiller 15 is lowered.

  Further, as shown in FIG. 8, the main speed change lever 290 has a lever shaft 291 to which a grip (grip part) 292 to be grasped by an operator is attached on the upper end side. The main transmission lever 290 is configured to be able to tilt forward and backward by pivotally supporting the lower end side of the lever shaft 291 inside the extending portion 282 that is below the front notch 283. That is, the main transmission lever 290 can be tilted back and forth between a substantially vertical posture and a forward posture. The front end surface of the extending portion 282 excluding the front notch portion 283 is a front surface that is a substantially ¼ circular curved surface that follows the rotation locus of the main transmission lever 290 as shown in FIGS. 8 and 9. The curved surface 285 is configured. Therefore, the grip 292 protrudes from the front curved surface 285 of the extending portion 282 regardless of the tilt posture of the main transmission lever 290. As a result, the operator's hand holding the grip 292 does not come into contact with the extending portion 282 of the armrest 259, so that the operator can smoothly operate the main transmission lever 290.

  When the main transmission lever 290 is tilted forward (toward the steering handle 9), the pump swash plate 159 (see FIG. 3) is adjusted in accordance with the operation position of the main transmission lever 290 detected by the main transmission potentiometer 290. The traveling speed of the traveling machine body 2 is accelerated by inclining to the positive inclination angle side. On the other hand, when the main transmission lever 290 is tilted rearward (toward the control seat 8), the pump swash plate 159 (FIG. 3) is adjusted in accordance with the operation position of the main transmission lever 290 detected by the main transmission potentiometer 290. Is inclined to the negative inclination angle side, and the traveling speed of the traveling machine body 2 is reduced.

  The operator can operate the main speed change lever 290 with the arm placed on the top cover 287 (on the armrest 259). Therefore, the main transmission lever 290 is very easy to operate, and a high effect can be exhibited in improving the traveling operability in the tractor 1. At this time, the position of the step 284 described above is such a position that the wrist and the like hardly overlap each other in plan view with the arm placed on the top cover 287 (on the armrest 259). Therefore, an arm or the like on the armrest 259 does not inadvertently hit the setting dial 226 and the selection switch 227 (does not obstruct), and erroneous operation of the setting dial 226 and the selection switch 227 can be reduced.

  As shown in FIGS. 7 to 9, the grip 292 of the main transmission lever 290 has a grip portion 293 whose upper surface is formed by a gently upward convex curved surface. The grip portion 293 of the grip 292 is inclined so that the top surface of the control seat 8 side is the uppermost end, and the operator can easily grip it with the right hand. The grip portion 293 is configured so that the left-right width is narrowed in a front view toward the connection portion with the lever shaft 291 (downward). That is, the grip portion 293 has a sag on its lower side. In addition, the grip 292 includes a lever connection portion 294 that is connected to the lever shaft 291 below the grip portion 293. The left / right width of the lever connecting portion 294 is equal to the left / right width below the grip portion 293.

  In the grip 292, an automatic elevating switch 229 is arranged on the front surface of the lever connecting portion 294, and an elevating fine adjustment switch 230 is arranged on the side surface (left side surface) of the lever connecting portion 294 on the control seat 8 side. In addition, the grip 292 has a display changeover switch 231 disposed on the steering surface on the control seat 8 side (left side) and a mode changeover switch 232 on the reverse side (right side) of the control seat 8 in the grip portion 293. It is arranged. The automatic raising / lowering switch 229 is for forcibly raising / lowering the rotary tiller 15 to a predetermined height. The elevation fine adjustment switch 230 is for finely adjusting the height position of the rotary tiller 15. The display changeover switch 231 is for switching display contents of the liquid crystal panel 330. The mode changeover switch 232 is for changing / adjusting the traveling speed during turning and reverse travel.

  The automatic lift switch 229 is a self-returning type (momentary type) lever switch that tilts in the vertical direction. When the automatic lift switch 229 is tilted upward, the rotary tiller 15 rises to the highest position set by the highest lift position setting dial 234, while when the automatic lift switch 229 is tilted downward, the rotary tiller The machine 15 is lowered to the position set by the working unit position dial 300. The lift fine adjustment switch 230 is a self-returning (momentary) rocker switch, and the rotary tiller 15 moves up and down only while the lift fine adjustment switch 230 is operated.

  As described above, the main transmission lever 290 includes the automatic up / down switch 229, the up / down fine adjustment switch 230, the display changeover switch 231, and the mode changeover switch 232, so that the operator can perform only the right-hand operation on the main transmission lever 290. Easy control according to the driving conditions. That is, the height position of the rotary tiller 15 can be adjusted by operating the automatic elevating switch 229 and the elevating fine adjustment switch 230 while tilting the main transmission lever 290. Further, even when the operator wants to switch the display content of the liquid crystal panel 330, the operator only has to operate the display changeover switch 231 without releasing his hand from the main transmission lever 290. Further, when the tractor 1 is turned or reversely moved only by operating the mode changeover switch 232 of the main speed change lever 290, it can be easily adjusted to a traveling speed set in advance optimally.

  As shown in FIGS. 7 and 9, the right side surface (side surface on the fender 19 side) of the extending portion 282 of the armrest 259 has a substantially circular recess (side notch portion) 288 and a working unit position dial (elevating dial). ) 300 is inserted. The recess 288 has a circular recess 288a with the right side surface of the extension 282 being recessed, and the working unit position dial 300 is rotatably inserted into the circular recess 288a. The recess 288 has a recess 288 b in which a part of the upper side of the circular recess 288 a is recessed to the upper surface of the extension 282, and the stepped portion before and after the recess 288 b regulates the rotation of the working unit position dial 300. It becomes rotation control part 289a, 289b.

  On the other hand, the working part position dial 300 is fitted and inserted so as to be pivotally supported at the center of the circular concave part 288a of the hollow part 288, and the outer side (upper side) ) Is provided with a knob (operation projection) 302 that is projected. That is, the knob 302 is configured to fit into the recess 288 b on the upper side of the recess 288, and the operator can check the knob 302 of the working unit position dial 300 from the upper side of the armrest 259.

  Further, even if the knob 302 is at the uppermost position of the working part position dial 300, the upper end of the knob 302 is lower than the upper surface of the extended part 282. When the knob portion 302 is in contact with the rotation restricting portion 289a, the rotation of the working portion position dial 300 forward (clockwise in FIG. 9) is restricted, while the knob portion 302 is in contact with the rotation restricting portion 289b. The rotation of the working unit position dial 300 to the rear (counterclockwise in FIG. 9) is restricted. Therefore, it is possible not only to prevent the work unit position dial 300 from being accidentally touched when the main transmission lever 290 is operated, but also to restrict the rotation area to a predetermined width when the work unit position dial 300 is operated.

  When the working portion position dial 300 is fitted into the recessed portion 288, the working portion position dial 300 protrudes outward (fender 19 side) from the right side surface of the extending portion 282. As a result, the operator can not only rotate the working unit position dial 300 by moving the knob 302 from the upper side of the armrest 259 with fingers, but also grip the outer peripheral surface from the right side (fender 19 side) of the armrest 259. In addition, the working unit position dial 300 can be rotated. Therefore, the operator can easily operate the working unit position dial 300 in a state where the arm is placed on the top cover 287 (on the armrest 259).

  When the working unit position dial 300 is rotated forward (clockwise in FIG. 9), the control solenoid valve 121 is switched to drive a single-acting hydraulic cylinder (not shown) to shorten and lift arm 193 (see FIG. 1). ). As a result, the rotary cultivator 15 moves down via the lower link 21. Conversely, when the working unit position dial 300 is tilted backward (counterclockwise in FIG. 9), the control solenoid valve 121 is switched to drive the single-acting hydraulic cylinder (not shown) to extend, and the lift arm 193 is moved. Turn upward. As a result, as a result, the rotary tiller 15 moves up via the lower link 21.

  In the embodiment, the main transmission lever 290, the setting dial 226, and the selection switch 227 are arranged on the upper surface of the extension portion 282 that is the front portion of the armrest 259, and the working portion position dial 300 is arranged on the side surface of the extension portion 282. doing. A main transmission lever 290, a setting dial 226, and a selection switch 227 are arranged on the left side of the extension part 282 (driver seat 8 side), and the working part position dial 300 is located on the right side of the extension part 282 (fender 19 side). Is arranged. Therefore, even when the tractor 1 is in operation, the operator can easily identify the travel system operation means and the work system operation means, which is effective in preventing erroneous operation. Further, since the main transmission lever 290, the setting dial 226, and the selection switch 227, which are traveling system operation means, are arranged together, the operability (handleability) is excellent.

  In addition, if the hand on the armrest 259 is moved in the left-right direction with the elbow as a fulcrum, the hand can easily reach the main transmission lever 290 and the working unit position dial 300. Therefore, there is an advantage that the main speed change lever 290 and the work part position dial 300 can be operated with only the hand on the armrest 259. When the arm is placed on the armrest 259, the main speed change lever 290 and the work part position dial 300 on the extension part 282 can be operated with a natural hand posture that does not bend the wrist downward. For this reason, the operability of the main transmission lever 290 and the working unit position dial 300 is remarkably improved and contributes to the stable support of the hand.

  The present invention is not limited to the above-described embodiment, and can be embodied in various forms. For example, the present invention is not limited to a tractor but can be applied to agricultural machines such as rice transplanters and combines, and special work vehicles such as wheel loaders. The engine 5 mounted on the traveling machine body 2 is not limited to a diesel engine, and may be a gasoline engine.

  Further, the armrest 259 may be provided on the left side of the control seat 8 regardless of the right side of the control seat 8. Moreover, when the armrest 259 provided with various operation means as described above is provided on one side of the left and right sides of the control seat 8, an armrest without operation means may be provided on the other side of the control seat 8. Furthermore, as shown in FIG. 10, the front end surface of the extension portion 282 of the armrest 259 has a front curve that is a substantially 1/4 circular curved surface without providing the front notch portion 283 in the above-described embodiment. You may comprise by the surface 285.

  In addition, the configuration of each unit is not limited to the illustrated embodiment, and various modifications can be made without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Tractor 2 Traveling machine body 5 Engine 6 Bonnet 7 Cabin 8 Control seat 9 Control handle 224 Plowing depth setting dial 225 PTO clutch switch 226 Rotation speed / vehicle speed setting dial 227 Rotation speed / vehicle speed selection switch 228 Inclination manual switch 229 Automatic elevating switch 230 Elevating Fine adjustment switch 231 Display changeover switch 232 Mode changeover switch 233 Inclination setting dial 234 Maximum ascent position setting dial 235 Lowering speed setting dial 245 Steering column 246 Instrument panel 259 Armrest 260 Operation table 281 Base 282 Extension 283 Front notch 284 Step 285 Front curve surface 286 Switch box 287 Upper surface cover 288 Depression 288a Circular recess 288b Recess 289a Rotation restricting portion 289b Rotation restricting portion 290 Main transmission lever 300 working unit position dial 301 outer circumferential surface 302 grip portion

Claims (4)

The power from the engine mounted on the traveling machine body is shifted by a hydraulic continuously variable transmission and transmitted to the traveling part and the working part, and the armrest for placing the operator's arms and hands is the traveling machine body A work vehicle disposed on the side of the control seat in
A main shift lever that shifts the traveling speed of the traveling unit is disposed on the side of the control seat at the front end of the armrest, and an elevating dial that moves the working unit up and down is disposed on a side surface of the armrest that is opposite to the control seat. And
The elevating dial is fitted to the side surface of the armrest so that the upper end of the elevating dial is lower than the upper surface of the armrest,
On the side surface of the armrest, a side notch for dial operation is provided on the upper side of the installation area of the lift dial, and an operation protrusion is provided above the lift dial,
A work vehicle configured as a rotation restricting portion for restricting the rotation of the elevating dial by bringing the step portions before and after the side notch into contact with the operation protrusion .   The main shift lever protrudes from the control seat side of the front end of the armrest, and the front surface of the armrest is configured by a curved surface corresponding to a turning locus of the main shift lever. Work vehicle. While the rear portion of the armrest is configured in parallel with the control seat, to claim 1 or 2 forward portion of said armrest, characterized in that it is configured so as to be separated from the control seat toward the front end The work vehicle described. On the upper surface of the armrest, a setting dial for setting the maximum speed of the traveling speed or the maximum engine speed at a position behind the main transmission lever and on the side of the control seat; and the setting dial any one of claims 1 to 3 set value and wherein the placement of a selection switch for alternatively selected whether it is a maximum speed of the maximum speed and the engine of the running speed by The work vehicle as described in.

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