Seat unit and work vehicle

Abstract

To provide a seat unit and a work vehicle in which an operator easily visually recognizes an obliquely downward direction while seating on a seat is detected.SOLUTION: A driver seat 4 comprises: a seat 41; a seat base 42; and a tilt mechanism 46. An operator is seated on the seat 41. The seat base 42 supports the seat 41 from below. The tilt mechanism 46 adjusts a slope of the seat 41 relative to the seat base 42. The seat base 42 includes a seating sensor 43. The seating sensor 43 detects whether a load is applied to a not-inclined seat 41 or not and whether a load is applied to an inclined seat 41 by the tilt mechanism 46 or not.SELECTED DRAWING: Figure 6

Description

[Technical field]

[0001] The present invention relates to a seat unit and a work vehicle. [Background technology]

[0002] The engine control device used in the work vehicle described in Patent Document 1 has a seat switch that detects whether the driver is sitting on the seat on the underside of the seat, and controls the engine according to the detection result of the seat switch. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-148036 A Summary of the Invention [Problem to be solved by the invention]

[0004] Generally, a work device is disposed in front of a work vehicle. The seat of the work vehicle is located behind and above the work device. Therefore, a driver seated in the seat has to turn his / her gaze diagonally downward to see the work device. In this case, depending on the positional relationship between the seat and the work device, a situation may arise in which the driver cannot see the work device while seated in the seat and leaves the seat. In this case, a seat switch such as that in the work vehicle described in Patent Document 1 cannot detect the driver being seated in the seat, which affects engine control.

[0005] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a seat unit and a work vehicle that can easily detect an occupant sitting in the seat while allowing easy visibility diagonally downward. [Means for solving the problem]

[0006] The seat unit according to the present invention comprises a seat, a seat base, and a tilt mechanism. A person sits in the seat. The seat base supports the seat from below. The tilt mechanism adjusts the inclination of the seat relative to the seat base. The seat base has a detection unit. The detection unit detects whether or not a load is applied to the seat when it is not tilted, and whether or not a load is applied to the seat when it is tilted by the tilt mechanism.

[0007] The work vehicle according to the present invention includes a traveling device and a traveling machine body. The traveling device travels in a farm field. The traveling machine body is disposed above the traveling device. The traveling machine body includes a seat unit and a driving space. The seat unit is disposed in the driving space. Effect of the Invention

[0008] According to the present invention, visibility in the diagonal downward direction can be easily confirmed while detecting the seating of a passenger. [Brief description of the drawings]

[0009] [Figure 1] 1 is a schematic diagram of a work vehicle according to an embodiment of the present invention; [Diagram 2] 1 is a block diagram of a work vehicle according to an embodiment of the present invention. [Diagram 3] FIG. 2 is a diagram showing a driving space of a work vehicle in the present embodiment. [Figure 4] FIG. 2 is a perspective view showing a driver's seat in a first position. [Diagram 5] FIG. 4 is a perspective view showing a second position of the driver's seat. [Figure 6] FIG. 2 is a side view comparing the first position and the second position. [Figure 7] FIG. 2 is an exploded view of the driver's seat in the first position. [Figure 8] FIG. 2 is an exploded view of the driver's seat in the second position. [Figure 9] FIG. 2 shows the seat base in a first position. [Figure 10]FIG. 13 shows the seat base in the second position. [Figure 11] 11 is a diagram showing the state inside the seat base when a driver is not seated in the seat. FIG. [Figure 12] 1 is a diagram showing the internal state of the seat base when a driver is seated in the seat. FIG. [Figure 13] FIG. [Figure 14] FIG. 2 is a side view showing a driver's seat in the driving space. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference characters and description thereof will not be repeated.

[0011] A work vehicle according to this embodiment will be described with reference to Figures 1 to 3. Figure 1 is a schematic diagram of a work vehicle 1 according to this embodiment. Figure 2 is a block diagram of the work vehicle 1 in this embodiment. Figure 3 is a diagram showing a driving space 2a of the work vehicle 1 in this embodiment.

[0012] In this specification, for ease of understanding, the front-rear direction, the left-right direction, and the up-down direction may be described. Here, the front-rear direction, the left-right direction, and the up-down direction are directions seen from the driver (worker) seated in the driver's seat 4 (FIG. 3) arranged in the driving space 2a (FIGS. 1 and 3). However, the front-rear direction, the left-right direction, and the up-down direction are defined merely for convenience of explanation, and are not intended to limit the orientation of the work vehicle of the present invention when used or assembled. Also, the forward direction may be described as the front direction facing the driver seated in the driver's seat 4.

[0013] The work vehicle 1 is, for example, a self-removing combine harvester. The work vehicle 1 is capable of automatic travel based on instructions from an operator, and performs work such as harvesting agricultural crops while automatically traveling. Note that the instruction for automatic travel is input to the work vehicle 1 by, for example, an operator operating a display operation device 31 described later. Note that the work vehicle 1 is not limited to a combine harvester, and may be any vehicle capable of automatic travel in a field. Examples of work vehicles include a seeding machine that travels while sowing seeds in a field, a fertilizer applicator that travels while applying fertilizer to a field, a chemical sprayer that travels while spraying chemicals in a field, a rice transplanter that travels while performing work such as planting seedlings, a tiller, and a tractor. Harvesting work, sowing, fertilization, chemical spraying, and planting work are examples of work performed by a work vehicle.

[0014] Autonomous driving means that at least steering is performed autonomously to follow a predetermined route by controlling devices related to driving by a control unit 50 (FIG. 2) equipped in the work vehicle 1. In addition to steering, the vehicle speed or work by a work device may be performed autonomously. Autonomous driving includes a case where a person is on board the work vehicle 1 and a case where no person is on board the work vehicle 1.

[0015] As shown in FIG. 1, the work vehicle 1 of this embodiment includes a traveling body 101, a traveling device 102, a reaping device 200, a thresher 300, a grain tank 400, a control unit 50, and a memory unit 55. The traveling device 102 is disposed below the traveling body 101 and supports the traveling body 101. The reaping device 200 is disposed in front of the traveling body 101. The reaping device 200 and the thresher 300 are examples of agricultural work equipment. The control unit 50 is disposed inside the traveling body 101. The memory unit 55 is disposed inside the traveling body 101.

[0016] The traveling machine body 101 (work vehicle 1) is equipped with an engine (not shown). The engine is, for example, a diesel engine. The engine converts thermal energy obtained by burning fuel into kinetic energy (power).

[0017] The traveling device 102 causes the work vehicle 1 to travel. Specifically, the traveling device 102 travels based on power (kinetic energy) generated in the engine. The traveling device 102 includes, for example, a pair of left and right traveling crawler devices. The pair of left and right traveling crawler devices causes the work vehicle 1 to travel in the forward and backward directions. In addition, the pair of left and right traveling crawler devices causes the work vehicle 1 to turn in the left and right directions.

[0018] The reaping device 200 is driven based on power (kinetic energy) generated by an engine. The reaping device 200 reaps uncut stalks in a farm field. In this embodiment, the reaping device 200 includes a reaping frame 201 and a stalk transport device 204.

[0019] The reaping frame 201 is mounted so as to be movable up and down on the front part of the traveling body 101. A cutting blade is disposed below the reaping frame 201. The reaping device 200 reciprocates the cutting blade to cut the base of uncut stalks in the field.

[0020] The stalk conveying device 204 conveys the stalks cut by the cutting blade to the threshing device 300.

[0021] The work vehicle 1 can drive the traveling device 102 to move within the field, while driving the reaping device 200 to continuously reap uncut stalks in the field.

[0022] The threshing device 300 is driven based on power (kinetic energy) generated by the engine. The threshing device 300 performs threshing work to thresh the reaped stalks transported to the traveling machine body 101 by the stalk transport device 204. The reaping work is included in the harvesting work. The grain tank 400 stores the grains threshed by the threshing device 300. Specifically, the threshing device 300 is equipped with a winnowing fan 303 and a dust discharge fan 305. The threshing device 300 threshes the tip side of the reaped stalks transported to the traveling machine body 101. The threshing device 300 shakes and sorts (gravity sorts) the threshed tip side (de-grained grain).

[0023] The winnowing fan 303 supplies screening air toward the reaped stalks after threshing. As a result, straw dust and other impurities are removed from the grains (threshed grain). The grains from which the straw dust and other impurities have been removed are transported to and stored in the grain tank 400. The dust discharge fan 305 discharges the dust from the rear of the threshing device 300 outside the machine.

[0024] Next, the driving space 2a of the work vehicle 1 will be described with reference to FIG. 1 and FIG. 3. As shown in FIG. 1 and FIG. 3, the traveling machine body 101 (work vehicle 1) includes a driver's seat 4 and a steering operation unit 2. The driver's seat 4 is arranged in the steering operation unit 2. In detail, a driving space 2a for a driver (worker) of the work vehicle 1 is formed inside the steering operation unit 2. Typically, the steering operation unit 2 (driving space 2a) is located above the mowing device 200. For example, the cutting blade of the mowing device 200 is located diagonally below the steering operation unit 2 (driving space 2a). In addition to the driver's seat 4, the driving device 20 required for driving the work vehicle 1 is arranged in the driving space 2a. In other words, the driving device 20 typically includes a steering wheel 21 and a main shift lever 22. For example, the steering wheel 21 is located in the center of the steering operation unit 2 and in front of the driver's seat 4. The steering operation unit 2 may be provided with a roof.

[0025] The steering wheel 21 is operated by a driver (operator) seated in the driver's seat 4 to change the direction in which the traveling device 102 shown in Fig. 1 travels. When the work vehicle 1 is in the manual traveling mode, the driver (operator) can turn the work vehicle 1 by operating the steering wheel 21. Turning includes, for example, a 90-degree turn (α turn), a U-turn, and a fishtail turn.

[0026] For example, the main speed change lever 22 is disposed to the left of the driver's seat 4. The main speed change lever 22 is operated by a driver (operator) seated in the driver's seat 4 to switch the traveling direction of the traveling device 102 shown in FIG. 1 between forward and reverse.

[0027] The main speed change lever 22 has various switches. The various switches of the main speed change lever 22 include, for example, a switch for adjusting the threshing depth, a switch for raising the reaping device 200, a switch for lowering the reaping device 200, a switch for adjusting the height of the reaping device 200, and a switch for switching whether or not the power generated in the engine is transmitted to the reaping device 200 and the threshing device 300. The steering wheel 21, the main speed change lever 22, and the various switches output signals to the control unit 50 indicating the contents of instructions according to operations by the driver (operator).

[0028] In addition to the steering wheel 21 and the main shift lever 22, the driving device 20 may also include a parking brake pedal (not shown) and the like.

[0029] The control unit 50 controls the traveling device 102, the reaping device 200, and the threshing device 300. Specifically, as shown in Fig. 2, the control unit 50 is a calculation device such as a CPU (Central Processing Unit).

[0030] The control unit 50 receives signals output from the steering wheel 21, the main speed change lever 22, various switches, etc., and controls the traveling device 102, the reaping device 200, and the threshing device 300 according to the instructions indicated by the signals. The control unit 50 may be a single piece of hardware, or may be multiple pieces of hardware that can communicate with each other.

[0031] The storage unit 55 is a main storage device such as a Read Only Memory (ROM) and a Random Access Memory (RAM). The storage unit 55 may further include an auxiliary storage device such as a Hard Disk Drive (HDD) or a Solid State Drive (SSD). Various programs and data are stored in the storage unit 55. The control unit 50 reads out and executes the various programs from the storage unit 55.

[0032] The control unit 50 is connected to, for example, a seating sensor 43 of the driver's seat 4, a vehicle speed sensor 66, a steering angle sensor 67, a reaping sensor 68, and a harvest amount sensor 69, which will be described later.

[0033] The vehicle speed sensor 66 detects the vehicle speed of the work vehicle 1. The vehicle speed sensor 66 is provided on an axle or the like arranged on the traveling device 102. When the vehicle speed sensor 66 is provided on an axle of the traveling device 102, the vehicle speed sensor 66 generates a pulse corresponding to the rotation of the axle. Data of the detection result obtained by the vehicle speed sensor 66 is output to the control unit 50.

[0034] The steering angle sensor 67 is provided, for example, on the steering wheel 21, and detects the steering angle of the steering wheel 21. Data on the detection result obtained by the steering angle sensor 67 is output to the control unit 50.

[0035] The mowing sensor 68 detects the height of the mowing device 200 and the driving state of the mowing device 200. The detection result data obtained by the mowing sensor 68 is output to the control unit 50. The control unit 50 can determine whether or not the mowing device 200 is performing mowing work based on the detection result of the mowing sensor 68. Mowing work is included in harvesting work.

[0036] The harvest yield sensor 69 detects the amount of grains harvested by the work vehicle 1. The harvest yield sensor 69 outputs information indicating the detected amount of grains to the control unit 50. For example, the harvest yield sensor 69 is provided in the grain tank 400. The harvest yield sensor 69 measures the degree of impact when the grains collide with the harvest yield sensor 69 as they are transported to the grain tank 400, and outputs the measurement result to the control unit 50. It should be noted that the harvest yield sensor 69 is not an essential component of the work vehicle 1.

[0037] Next, the driver's seat 4 will be described with reference to Fig. 4 to Fig. 6. Fig. 4 is a perspective view showing a first position P1 of the driver's seat 4. Fig. 5 is a perspective view showing a second position P2 of the driver's seat 4. Fig. 6 is a side view comparing the first position P1 and the second position P2.

[0038] In this embodiment, the driver's seat 4 is an example of a seat unit. The driver's seat 4 includes a seat 41, a seat base 42, a cover 44, and a tilt mechanism 46. The seat base 42 includes a seating sensor 43. A driver sits on the seat 41. For example, the seat 41 includes a seat surface 41a and a backrest 42b. When the driver sits on the seat surface 41a and leans against the backrest 42b, the driver faces the front direction (forward). The seat base 42 supports the seat 41 from below. The seat base 42 is fixed to the floor of the steering operation unit 2 (driving space 2a) via a fixing member 45 (FIGS. 4 to 7). The cover 44 covers a part of the seat base 42 and is provided detachably with respect to the seat base 42. The cover 44 will be described later. The tilt mechanism 46 adjusts the inclination of the seat 41 with respect to the seat base 42. The tilt mechanism 46 is disposed in the seat base 42 .

[0039] In this embodiment, the seat 41 can be mutually moved between a first position P1 (FIGS. 4 and 6) and a second position P2 (FIGS. 5 and 6) by a tilt mechanism 46 described later. The first position P1 indicates a state in which the seat surface 41a of the seat 41 is inclined at an angle (elevation angle) α1 [°] with respect to the reference plane S1 of the seat base 42. The second position P2 indicates a state in which the seat surface 41a of the seat 41 is inclined at an angle (elevation angle) α2 [°] with respect to the reference plane S1 of the seat base 42. Hereinafter, the inclination angle of the seat surface 41a in the first position P1 may be referred to as angle α1, and the inclination angle of the seat surface 41a in the second position P2 may be referred to as angle α2. In this embodiment, the angle α2 is greater than the angle α1. The angle α1 includes (0 [°]). In other words, the first position P1 includes a state in which the seat surface 41a is not inclined with respect to the reference plane S1 of the seat base 42. For example, the reference plane S1 is a plane parallel to the floor of the steering operation unit 2 (driving space 2a).

[0040] When the driver sits in the driver's seat 4 in the second position P2, the driver's field of vision is biased downward compared to when the driver sits in the driver's seat 4 in the first position P1. Therefore, the driver sitting in the driver's seat 4 in the second position P2 can easily visually confirm the state of the cutting blade of the cutting device 200 located diagonally below the steering operation unit 2 (driving space 2a).

[0041] The seating sensor 43 detects whether the driver is seated, regardless of whether the seat 41 is in the first position P1 or the second position P2. In other words, the seating sensor 43 detects whether a load is applied to the seat 41 that is not tilted, and whether a load is applied to the seat 41 that is tilted by the tilt mechanism 46. The operation of the seating sensor 43 will be described later. The seating sensor 43 is an example of a detection unit.

[0042] In this way, the seating sensor 43 detects whether or not the driver is seated in the seat 41, the inclination of which can be adjusted by the tilt mechanism 46. In particular, since the seating sensor 43 can detect the seating of the seat 41 in the second position P2, the driver's seat 4 in this embodiment can easily visually confirm diagonally downward while detecting the seating of the seat 41.

[0043] Next, the transition between the first position P1 and the second position P2 will be described with reference to Figs. 4 to 10. Fig. 7 is an exploded view of the driver's seat 4 in the first position P1. Fig. 8 is an exploded view of the driver's seat 4 in the second position P2. Figs. 7 and 8 show the driver's seat 4 with the cover 44 removed. Fig. 9 is a view showing the seat base 42 in the first position P1. Fig. 10 is a view showing the seat base 42 in the second position P2.

[0044] As shown in Figs. 7 to 10, the seat base 42 has a first base 421, a second base 422, and a plurality of springs 423. The seat 41 is placed on the first base 421. The second base 422 supports the first base 421 from below. The plurality of springs 423 are an example of an elastic member. The plurality of springs 423 are provided between the first base 421 and the second base 422. The plurality of springs 423 bias the first base 421 toward the seat 41. In the example shown in Figs. 4 to 10, the springs 423 are not shown due to the angle of the drawings. The springs 423 are shown in Figs. 11 and 12, and will be described in detail with reference to Figs. 11 and 12.

[0045] Specifically, the first base 421 and the second base 422 are formed by combining a metal plate and a frame. Typically, the first base 421 and the second base 422 have a shape that conforms to the seat surface 41a of the seat 41 when viewed from above.

[0046] The second base 422 is attached to a fixing member 45 (FIGS. 4 to 10). The first base 421 is disposed above the second base 422 via a plurality of springs 423 (FIGS. 11 and 12). That is, one end of each of the plurality of springs 423 is connected to the first base 421, and the other end of each of the plurality of springs 423 is connected to the second base 422. As a result, the first base 421 is biased by the elastic force of the plurality of springs 423 toward the seat 41, away from the second base 422.

[0047] The first base 421 is provided with a tilt mechanism 46. The tilt mechanism 46 includes a first rotation mechanism 461 and an adjustment mechanism 462. In other words, the first rotation mechanism 461 and the adjustment mechanism 462 are disposed on the first base 421 of the seat base 42. In this embodiment, the seat 41 has a first end 41F on the front side and a second end 41R on the rear side facing the first end 41F. The first rotation mechanism 461 rotates the first end 41F of the seat 41 in the up and down direction. The adjustment mechanism 462 adjusts the distance between the second end 41R of the seat 41 and the seat base 42 (first base 421). The tilt mechanism 46 allows the tilt angle of the seat 41 to be adjusted with a simple configuration.

[0048] Specifically, the first rotation mechanism 461 is provided at the front end of the first base 421. The first rotation mechanism 461 includes a first rotation shaft 461B. The seat 41 is rotatably attached to the first rotation shaft 461B via a mounting fixture 461A provided at a first end 41F of the seat 41. This enables the seat 41 to rotate about the first rotation shaft 461B.

[0049] The adjustment mechanism 462 is disposed on the seat base 42 (first base 421) closer to the second end 41R than the first rotation mechanism 461. The adjustment mechanism 462 has a support portion 462A, a connection portion 462B, and a second rotation mechanism 462C. The support portion 462A is a rod-shaped member extending along the left-right direction, and supports the second end 41R side of the seat 41 closer to the first rotation mechanism 461. The connection portion 462B connects the support portion 462A to the seat base 42 (first base 421). Specifically, the connection portion 462B is a member extending from the support portion 462A along a direction intersecting the left-right direction, and one end portion is attached to the support portion 462A, and the other end portion is attached to the seat base 42 (first base 421). The second rotation mechanism 462C supports the connection portion 462B so as to be rotatable in the up-down direction. Specifically, the second rotation mechanism 462C includes a second rotation shaft 462D. The connection part 462B is rotatably attached to the second rotation shaft 462D. As a result, the support part 462A connected to the connection part 462B rotates about the second rotation shaft 462D. Therefore, the distance between the second end part 41R of the seat 41 and the seat base 42 (first base 421) can be adjusted with a simple configuration.

[0050] [Transition from first position P1 to second position P2] When the driver's seat 4 moves from the first position P1 shown in Figures 4 and 6 to the second position P2 shown in Figures 5 and 6, the seat 41 (the mounting fixture 461A) is first rotated a predetermined angle or more in the rotation direction D1 shown in Figures 7 to 10 and stopped at a predetermined position. At this time, the seat 41 (the mounting fixture 461A) rotates from the first position Pa1 shown in Figures 7 and 9 in the rotation direction D1.

[0051] Next, the seat 41 (mounting fixture 461A) is rotated from a first position Pb1 (FIGS. 7 and 9) which is the position of the support part 462A in the driver's seat 4 in the first position P1 to a second position Pb2 (FIGS. 8 and 10) in a rotation direction D3 shown in FIGS. 7 to 10. In the second position Pb2, the vertical distance from the second rotation shaft 462D to the support part 462A is greater than that in the first position Pb1. That is, the vertical position of the support part 462A in the second position Pb2 is higher than the vertical position of the support part 462A in the first position Pb1. In other words, the vertical position of the support part 462A changes in response to the rotation.

[0052] Next, the seat 41 (the mounting fixture 461A) is rotated in a rotation direction D2, which is the opposite direction to the rotation direction D1 shown in Figs. 7 to 10, until it comes into contact with the support part 462A located at the second position Pb2. In other words, the seat 41 (the mounting fixture 461A) stops rotating at the second position P2. As a result, the seat 41 is supported from below at the second position P2 by the support part 462A located at the second position Pb2.

[0053] [Transition from second position P2 to first position P1] When the driver's seat 4 moves from the second position P2 shown in Figures 5 and 6 to the first position P1 shown in Figures 4 and 6, first, the seat 41 (mounting fixture 461A) is rotated in the rotational direction D1 shown in Figures 7 to 10 by a predetermined angle or more and stopped at a predetermined position.

[0054] Next, the support portion 462A is rotated from the second position Pb2 (FIGS. 8 and 10) to the first position Pb1 (FIGS. 7 and 9) in a rotation direction D4 that is the opposite direction to the rotation direction D3 shown in FIGS.

[0055] Next, the seat 41 is rotated in the rotation direction D2 shown in Figures 7 to 10 until it comes into contact with the support part 462A located at the first position Pb1. In other words, the seat 41 stops rotating at the first position P1. As a result, the seat 41 is supported from below at the first position P1 by the support part 462A located at the first position Pb1.

[0056] [Seating detection] Next, detection of seating by the seating sensor 43 will be described with reference to Fig. 11 and Fig. 12. Fig. 11 is a diagram showing the internal state of the seat base 42 when the driver is not seated in the seat 41. Fig. 12 is a diagram showing the internal state of the seat base 42 when the driver is seated in the seat 41.

[0057] As shown in FIG. 11 and FIG. 12, the first base 421 and the second base 422 are rotatably connected to each other via a rotating shaft 420C. In addition, two springs 423 are arranged in the front-rear direction between the first base 421 and the second base 422, in front of the rotating shaft 420C. As a result, the distance between the first base 421 and the second base 422 varies depending on the load applied to the seat 41. In this embodiment, the seating sensor 43 is a potentiometer. Typically, the seating sensor 43 is arranged on the first base 421. The seating sensor 43 detects whether or not a load is applied to the seat 41 based on the distance between the first base 421 and the second base 422.

[0058] Since the seat 41 is placed on the first base 421 via the tilt mechanism 46, the distance between the first base 421 and the second base 422 according to the load applied to the seat 41 is the same regardless of whether the seat 41 is in the first position P1 or the second position P2. Therefore, the seating sensor 43 can detect whether the driver is seated in the seat 41 regardless of whether the seat is in the first position P1 or the second position P2.

[0059] Specifically, the seating sensor 43 includes a variable resistance unit 431, a rotary switch 432, and a signal input / output unit 433. The rotary switch 432 rotates in a rotation direction D5 or a rotation direction D6 around a rotation center 432C. The electric resistance value of the variable resistance unit 431 changes depending on the position of the rotary switch 432. For example, a predetermined voltage is applied to the variable resistance unit 431 via the signal input / output unit 433. The signal input / output unit 433 outputs an electric signal indicating a voltage Vo according to the electric resistance value of the variable resistance unit 431 to the control unit 50.

[0060] As shown in FIG. 11, when the driver is not seated in the seat 41, the first base 421 is located at a distance L1 from the second base 422 at the position of the spring 423. The seating sensor 43 is disposed on the first base 421 with the tip of the rotary switch 432 facing downward. At this time, the tip of the rotary switch 432 contacts the plate 422P provided on the second base 422. The position of the rotary switch 432 at this time is defined as the first position Pc1. The signal input / output unit 433 outputs an electrical signal indicating a voltage V0 according to the electrical resistance value corresponding to the first position Pc1 of the variable resistor unit 431 to the control unit 50. The control unit 50 determines whether or not the driver is seated in the seat 41 based on the voltage V0 indicated by the electrical signal received from the signal input / output unit 433. For example, the control unit 50 compares the voltage V0 indicated by the electrical signal received from the signal input / output unit 433 with a threshold value, and determines that the driver is not seated in the seat 41 when the voltage V0 is greater than the threshold value.

[0061] On the other hand, as shown in FIG. 12, when the driver sits on the seat 41, the front side of the first base 421 rotates downward around the rotation axis 420C according to the weight of the driver. As a result, the spring 423 is compressed in the vertical direction, and the distance between the first base 421 and the second base 422 at the position of the spring 423 is reduced to a distance L2. As a result, the rotary switch 432 is pushed upward by the plate 422P, rotates a predetermined angle in the rotation direction D5, and moves to the second position Pc2. The signal input / output unit 433 outputs an electric signal indicating a voltage V1 according to the electric resistance value corresponding to the second position Pc2 of the variable resistance unit 431 to the control unit 50. For example, the control unit 50 compares the voltage V1 indicated by the electric signal received from the signal input / output unit 433 with a threshold value, and determines that the driver is sitting on the seat 41 when the voltage V1 is smaller than the threshold value.

[0062] Furthermore, when the driver leaves the seat 41, the spring 423 expands in the vertical direction due to its elastic force, lifting the first base 421 upward. As a result, the distance between the first base 421 and the second base 422 at the position of the spring 423 extends to a distance L1. In this state, the rotary switch 432 moves to the first position Pc1 due to, for example, its own weight.

[0063] 12, the seating sensor 43 is disposed on the first base 421, and the plate 422P for operating the rotary switch 432 of the seating sensor 43 is disposed on the second base 422, but the positions of the seating sensor 43 and the plate 422P may be reversed. In addition, the positions and orientations of the seating sensor 43 and the plate 422P on the first base 421 are not particularly limited.

[0064] The control unit 50 controls the traveling device 102, the harvesting device 200, and the threshing device 300 based on the result of determining whether or not the driver is seated in the seat 41. As a result, the work vehicle 1 is controlled depending on whether or not the driver is seated in the seat 41, so that the work vehicle 1 can provide an environment in which the driver and people around the work vehicle 1 can work with peace of mind.

[0065] Next, the movement of the seat 41 in the driver's seat 4 in the front-rear direction will be described with reference to Fig. 13. Fig. 13 is a side view showing the seat base 42. Fig. 13 shows the driver's seat 4 with the driver seated in the seat 41.

[0066] 13, the first base 421 has a main body portion 421D, a movable portion 421U, and a pair of slide rails 421R. In other words, in the first base 421, the main body portion 421D and the movable portion 421U are connected via the pair of slide rails 421R. The pair of slide rails 421R support the movable portion 421U so as to be slidable in the front-rear direction relative to the main body portion 421D. The pair of slide rails 421R is an example of a rail member.

[0067] Specifically, each of the pair of slide rails 421R includes an outer rail 421Ra and an inner rail 421Rb that fit together. A spring 423 is connected to the lower surface of the main body 421D. That is, the position of the main body 421D relative to the second base 422 is fixed. A pair of inner rails 421Rb extending along the front-rear direction is disposed on the upper surface of the main body 421D. The pair of inner rails 421Rb are disposed side by side in the left-right direction on the upper surface of the main body 421D. Note that since FIG. 13 is a side view, only one of the pair of slide rails 421R and the pair of inner rails 421Rb is illustrated.

[0068] The movable part 421U slides and moves in the front-rear direction relative to the main body part 421D. A tilt mechanism 46 is disposed on an upper surface of the movable part 421U. A pair of outer rails 421Ra are disposed on a lower surface of the movable part 421U at positions corresponding to the pair of inner rails 421Rb of the main body part 421D.

[0069] By fitting the pair of outer rails 421Ra to the pair of inner rails 421Rb, the movable part 421U can slide relative to the main body part 421D along the extending direction of the pair of slide rails 421R. FIG. 13 shows a state in which the movable part 421U slides forward relative to the main body part 421D, as compared with FIG. 12. In this way, by providing the pair of slide rails 421R extending along the front-rear direction on the first base 421, the movable part 421U on which the tilt mechanism 46 is arranged can slide in the front-rear direction relative to the main body part 421D and the second base 422. As a result, the seat 41 can slide in the front-rear direction while maintaining the inclination adjustment function. Therefore, the seat position of the driver's seat 4 can be adjusted more flexibly in the steering operation part 2 (driving space 2a) of the work vehicle 1.

[0070] Next, adjustment of the height of the driver's seat 4 in the steering operation unit 2 (driving space 2a) will be described with reference to Fig. 14. Fig. 14 is a side view showing the driver's seat 4 in the steering operation unit 2 (driving space 2a).

[0071] As shown in FIG. 14, the fixed member 45 provided in the steering operation unit 2 (driving space 2a) is provided with two stages of through holes H1 and H2 arranged side by side in the vertical direction, and through holes H3 and H4 arranged in front of the through holes H1 and H2, respectively. In this embodiment, the driver's seat 4 is adjustable in height in the vertical direction with respect to the steering operation unit 2 (driving space 2a). Specifically, the vertical position (height) of the driver's seat 4 with respect to the fixed member 45 (steering operation unit 2, driving space 2a) can be adjusted by passing the rotation shaft 420C through either the through hole H3 or the through hole H4 and attaching the second base 422 to the fixed member 45 via the corresponding through hole H1 or through hole H2 with a bolt B1 or the like. This allows the seat 41 to be adjusted in height while retaining the inclination adjustment function. Therefore, the seat position of the driver's seat 4 can be adjusted more flexibly in the steering operation unit 2 (driving space 2a) of the work vehicle 1.

[0072] The through-holes for adjusting the height of the driver's seat 4 may be provided in three or more stages. The height of the driver's seat 4 may be adjusted by a method other than using the through-holes. For example, the driver's seat 4 may have a mechanism for continuously adjusting the height by utilizing air pressure.

[0073] Next, the cover 44 will be described with reference to Figs. 4 to 6. The cover 44 is formed of one or more plate-like members, and covers at least a part of the gap between the first base 421 and the second base 422. In this embodiment, the cover 44 covers the front surfaces of the first base 421 and the second base 422, and the front sides of both side surfaces. As a result, the cover 44 covers the front and the front sides of both side surfaces of the gap between the first base 421 and the second base 422. This makes it difficult for the internal structure of the seat base 42, such as the springs 423, to be seen from the outside, creating a beautiful appearance, and also makes it difficult for parts of the human body and objects to enter between the first base 421 and the second base 422.

[0074] In this embodiment, the adjustment mechanism 462 is configured to change the height of the support part 462A by rotation, but this is not limited thereto, and the height of the support part 462A may be adjusted, for example, in the same manner as the adjustment of the height of the driver's seat 4 relative to the steering operation part 2 (driving space 2a).

[0075] The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to the above embodiments, and can be implemented in various aspects without departing from the gist of the present invention. In addition, the components disclosed in the above embodiments can be modified as appropriate. For example, a certain component among all the components shown in one embodiment may be added to a component of another embodiment, or some components among all the components shown in one embodiment may be deleted from the embodiment.

[0076] In addition, the drawings are mainly schematic illustrations of each component to facilitate understanding of the invention, and the thickness, length, number, spacing, etc. of each component shown in the drawings may differ from the actual ones due to the convenience of creating the drawings. In addition, the configurations of each component shown in the above embodiment are merely examples and are not particularly limited, and it goes without saying that various modifications are possible within a range that does not substantially deviate from the effects of the present invention.

[0077] The present technology can be configured as follows. (1) A seat on which a person sits; A seat base that supports the seat from below; a tilt mechanism for adjusting the inclination of the seat relative to the seat base; Equipped with The seat base has a detection unit that detects whether or not a load is applied to the seat when it is not tilted and whether or not a load is applied to the seat when it is tilted by a tilt mechanism. (2) The seat has a first end on a forward side and a second end opposite the first end, The tilt mechanism includes: A first rotation mechanism that supports the first end portion so as to be rotatable in the vertical direction; an adjustment mechanism for adjusting the distance between the second end and the seat base; having A seat unit (1) wherein the first rotation mechanism and the adjustment mechanism are disposed on the seat base. (3) The adjustment mechanism includes: A support portion that supports the seat; a connection portion connecting the support portion to the seat base; a second rotation mechanism that supports the connection portion so as to be rotatable in the vertical direction; (2) A seating unit having: (4) The seat base is A first base on which the seat is placed; a second base supporting the first base from below; an elastic member provided between the first base and the second base and configured to bias the first base toward the seat; having The seat unit according to any one of (1) to (3), wherein the detection unit detects whether or not the load is applied based on the distance between the first base and the second base. (5) The first base is a movable part in which the tilt mechanism is disposed; a rail member that supports the movable portion so as to be slidable in the front-rear direction; (4) A seating unit having (6) A seat unit according to (4) or (5), comprising a cover that covers at least a portion of the gap between the first base and the second base. (7) A traveling device for traveling in a field; A traveling machine body disposed above the traveling device; Equipped with The traveling machine body is Any of the seat units (1) to (6) above; a driving space in which the seat unit is arranged; Including, work vehicles. (8) A work vehicle according to (7), wherein the seat unit is adjustable in height in the vertical direction relative to the driving space. [Industrial Applicability]

[0078] The present invention can be used in the field of work vehicles. [Explanation of symbols]

[0079] 1: Work vehicle 2a: Driving space 4: Driver's seat 41: Seat 42: Seat base 43: Detection unit (seating sensor) 44: Cover 46: Tilt mechanism 101: Running vehicle 102: Running gear 421: First Base 421R: Rail parts (slide rails) 421U: Moving part 422: Second Base 423: Spring 461: First rotating mechanism 462:Adjustment mechanism 462A: Support part 462B: Connection part 462C: Second rotating mechanism

Claims

1. A seat on which a person sits; A seat base that supports the seat from below; a tilt mechanism for adjusting the inclination of the seat relative to the seat base; Equipped with The seat base has a detection unit that detects whether or not a load is applied to the seat when it is not tilted and whether or not a load is applied to the seat when it is tilted by the tilt mechanism.

2. The seat has a first end in a forward direction and a second end opposite the first end, The tilt mechanism includes: A first rotation mechanism that supports the first end portion so as to be rotatable in the vertical direction; an adjustment mechanism for adjusting the distance between the second end and the seat base; having The seating unit of claim 1 , wherein the first rotation mechanism and the adjustment mechanism are disposed in the seat base.

3. The adjustment mechanism includes: A support portion that supports the seat; a connection portion connecting the support portion to the seat base; a second rotation mechanism that supports the connection portion so as to be rotatable in the vertical direction; 3. The seating unit of claim 2, comprising:

4. The seat base comprises: A first base on which the seat is placed; a second base supporting the first base from below; an elastic member provided between the first base and the second base and configured to bias the first base toward the seat; having The seat unit according to claim 1 , wherein the detection section detects whether or not the load is applied based on a distance between the first base and the second base.

5. The first base is a movable part in which the tilt mechanism is disposed; a rail member that supports the movable portion so as to be slidable in the front-rear direction; 5. The seating unit of claim 4, comprising:

6. The seat unit according to claim 4 , further comprising a cover that covers at least a portion of the gap between the first base and the second base.

7. A traveling device that travels in a field; A traveling machine body disposed above the traveling device; Equipped with The traveling machine body is A seat unit according to any one of claims 1 to 3; a driving space in which the seat unit is arranged; Including, work vehicles.

8. The work vehicle according to claim 7 , wherein the seat unit is adjustable in height in a vertical direction with respect to the driving space.

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