Work vehicle

Abstract

To stably detect seating of a driver.SOLUTION: A rice transplanter 1 that travels on an agricultural field includes a vehicle body 11, a driver seat 25, and a seating sensor 43. The driver seat 25 is provided in the vehicle body 11. The seating sensor 43 detects posture of the driver seat 25. The driver seat 25 includes: a seat surface 251a on which the driver is seated; a support portion 251A that supports a first end portion 251F on a front side of the seat surface 251a; and an arm portion 253 extending rearward from the support portion 251A. The support portion 251A rotationally supports the first end portion 251F in such a manner that a second end portion 251R on a rear side of the seat surface 251a is movable in a vertical direction, and rotationally supports an end portion on a front side of the arm portion 253 in such a manner that an end portion on a rear side of the arm portion 253 is movable in a vertical direction. The arm portion 253 rotates in cooperation with a rotation of the first end portion 251F. The seating sensor 43 detects a posture of the driver seat 25 based on a position of the arm portion 253.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a work vehicle.

Background Art

[0002] The engine control device used in the work vehicle described in Patent Document 1 arranges a seat switch for detecting seating on the seat on the lower surface side of the seat part which is the seating part 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

Summary of the Invention

Problems to be Solved by the Invention

[0004] The seat as described in Patent Document 1 may tilt or deform due to the seating posture or the like. In this case, depending on the positional relationship between the seat part and the seat switch, the seating on the seat of the seat part may not be correctly detected, and the detection process of the seat switch may become unstable.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a work vehicle capable of stably detecting the seating of a driver.

Means for Solving the Problems

[0006] The work vehicle according to the present invention travels in a farm field. The work vehicle according to the present invention includes a vehicle body part, a seat, and a detection part. The seat is disposed on the vehicle body part. The detection part detects the posture of the seat. The seat has a seat surface part, a support part, and an arm part. The driver sits on the seat surface part. The support part supports a first end part on the front side of the seat surface part. The arm part extends rearward from the support part. The support part rotatably supports the first end part such that a second end part on the rear side of the seat surface part is movable in the vertical direction. The support part rotatably supports a front end part of the arm part such that a rear end part of the arm part is movable in the vertical direction. The arm part rotates in conjunction with the rotation of the first end part of the seat surface part. The detection part detects the posture of the seat based on the position of the arm part.

Effect of the Invention

[0007] According to the present invention, it becomes possible to stably detect the seating of the driver.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Mode for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and the description will not be repeated.

[0010] Referring to FIGS. 1 and 2, the rice transplanter 1 according to the present embodiment will be described. FIG. 1 is a side view of the rice transplanter 1 in the present embodiment. FIG. 2 is a block diagram of the rice transplanter 1 in the present embodiment.

[0011] As shown in FIG. 1, the rice transplanter 1 includes a traveling body 10 and a seedling planting work implement 14. The traveling body 10 includes a vehicle body portion 11, front wheels 12, and rear wheels 13. A pair of left and right front wheels 12 are provided with respect to the vehicle body portion 11. Similarly, a pair of left and right rear wheels 13 are also provided with respect to the vehicle body portion 11.

[0012] The vehicle body portion 11 includes a bonnet 21. The bonnet 21 is provided at the front portion of the vehicle body portion 11. An engine 22 is provided inside the bonnet 21.

[0013] The power generated by the engine 22 is transmitted to the front wheels 12 and the rear wheels 13 via a transmission case 23. This power is also transmitted to the seedling planting work implement 14 via the transmission case 23 and a power take-off shaft (hereinafter referred to as "PTO shaft 24") disposed at the rear portion of the vehicle body portion 11.

[0014] The vehicle body portion 11 further includes a driver's seat 25, a plurality of operation members, and a control unit 50. An operator can sit on the driver's seat 25. The driver's seat 25 is disposed between the front wheels 12 and the rear wheels 13 in the front-rear direction of the vehicle body portion 11. The plurality of operation members include a steering handle 26, a shift operation pedal 27, and a main shift lever 28.

[0015] The steering wheel 26 is a handle for the operator to steer the rice transplanter 1. The shift operation pedal 27 is a pedal for the operator to adjust the traveling speed of the rice transplanter 1. The main shift lever 28 is configured such that the operator can select, for example, "forward", "reverse", "stop", etc. When the main shift lever 28 is operated to the "forward" position, power is transmitted so that the front wheels 12 and the rear wheels 13 rotate in the direction of moving the rice transplanter 1 forward. On the other hand, when the main shift lever 28 is operated to the "reverse" position, power is driven so that the front wheels 12 and the rear wheels 13 rotate in the direction of moving the rice transplanter 1 backward. When the main shift lever 28 is operated to the "stop" position, the transmission of power to the front wheels 12 and the rear wheels 13 is interrupted. Note that "forward" may be divided into "low speed" for traveling in the field and "high speed" for traveling outside the field.

[0016] The control unit 50 controls the rice transplanter 1. As an example, the control unit 50 is an ECU (Electronic Control Unit), and includes an arithmetic unit, an input / output unit, etc., and a storage unit 55. The arithmetic unit is a processor or a microprocessor, etc. The storage unit 55 is a main storage device such as a ROM (Read Only Memory) and a RAM (Random Access Memory). The storage unit 55 may further include an auxiliary storage device such as an HDD (Hard Disk Drive) or an SSD (Solid State Drive). Various programs, data, etc. are stored in the storage unit 55. The arithmetic unit reads out various programs from the storage unit 55 and executes them. The control unit 50 may be one piece of hardware, or may be a plurality of pieces of hardware that can communicate with each other.

[0017] Signals corresponding to the operations of the steering wheel 26, the shift operation pedal 27, and the main shift lever 28 are input to the control unit 50. In addition, for example, a vehicle speed sensor (not shown) is connected to the control unit 50, and a signal indicating the detection result of the vehicle speed sensor is input.

[0018] Based on the various input signals, the control unit 50 controls the traveling speed and the traveling direction of the traveling body 10.

[0019] As shown in FIG. 1, the seedling planting work machine 14 is disposed, for example, behind the vehicle body portion 11. The seedling planting work machine is connected to the vehicle body portion 11 via a lifting link mechanism 31. The lifting link mechanism 31 is constituted by a parallel link including a top link 31a and a lower link 31b.

[0020] In the lifting link mechanism 31, a lifting cylinder 32 of a lifting device is connected to the lower link 31b. The lifting device can lift the seedling planting work machine 14 up and down with respect to the vehicle body portion 11 by expanding and contracting the lifting cylinder 32. Note that the lifting cylinder 32 is a hydraulic cylinder in the present embodiment, but may be an electric cylinder. Further, the lifting device may lift the seedling planting work machine 14 by an actuator other than a cylinder.

[0021] As shown in FIG. 1, the seedling planting work machine 14 includes a planting input case portion 33, a plurality of planting units 34, a seedling mounting table 35, and a plurality of floats 36. The seedling planting work machine 14 sequentially supplies seedlings from the seedling mounting table 35 to each planting unit 34 and continuously plants the seedlings. Further, the vehicle body portion 11 includes a spare seedling mounting table 37.

[0022] Each planting unit 34 has a planting transmission case portion 41 and a rotating case portion 42. Power is transmitted to the planting transmission case portion 41 via the PTO shaft 24 and the planting input case portion 33.

[0023] The rotating case portion 42 is rotatably attached to the planting transmission case portion 41. The rotating case portion 42 is disposed on one or both sides in the vehicle width direction of the planting transmission case portion 41. Two planting claws are attached to one side in the vehicle width direction of each rotating case portion 42.

[0024] The two planting claws are arranged in the traveling direction of the rice transplanter 1. The two planting claws are displaced as the rotating case portion 42 rotates. When the two planting claws are displaced, the seedlings for one row are planted.

[0025] [Driver's seat] Next, with reference to FIGS. 3 and 4, the driver's seat 25 will be described. FIG. 3 is a perspective view showing the driver's seat 25. FIG. 4 is a view showing a state in which the seat cushion 251 is removed from the driver's seat 25 of FIG. 3.

[0026] In the present embodiment, the driver's seat 25 is an example of a seat. As shown in FIG. 3, the driver's seat 25 includes a seat cushion 251 and a seat base 252. For example, the seat cushion 251 includes a seating surface portion 251a and a backrest 251b. When the driver sits on the seating surface portion 251a and leans against the backrest 251b, the driver faces the front direction (forward). For example, the seating surface portion 251a and the backrest 251b are integrally formed of resin.

[0027] The seat base 252 supports the seat cushion 251 from below. The seat base 252 constitutes a part of the traveling aircraft 10 (the vehicle body portion 11). For example, the seat base 252 is formed by combining a metal frame. Generally, metal has higher rigidity than resin. Therefore, in the present embodiment, the seat base 252 has higher rigidity than the seat cushion 251 made of resin. As a result, the seat cushion 251 is more likely to be distorted and bent than the seat base 252.

[0028] Also, as shown in FIG. 4, the driver's seat 25 further includes a support portion 251A and an arm portion 253. In the present embodiment, the seating surface portion 251a has a first end portion 251F on the front side and a second end portion 251R on the rear side facing the first end portion 251F. The support portion 251A supports the first end portion 251F of the seating surface portion 251a. The support portion 251A rotatably supports the first end portion 251F such that the second end portion 251R can move in the vertical direction.

[0029] Specifically, the support portion 251A is provided on the seat base 252. Typically, the support portion 251A is provided at the front end of the seat base 252. The support portion 251A includes a first rotation axis 251B. The seat surface portion 251a is rotatably attached to the first rotation axis 251B via a fixture 251C provided at the first end portion 251F of the seat surface portion 251a.

[0030] The arm portion 253 extends rearward from the support portion 251A. As an example, the arm portion 253 is an arm formed of a material such as metal or resin. The shape of the arm portion 253 is not particularly limited, and may be a prismatic shape, a cylindrical shape, or a flat plate shape. Details regarding the shape of the arm portion 253 will be described later. One (front side) end portion of the arm portion 253 is attached to the first rotation axis 251B. That is, the support portion 251A supports the arm portion 253 so as to be rotatable in the vertical direction. Specifically, the arm portion 253 is attached to the fixture 251C and is rotatable about the first rotation axis 251B via the fixture 251C. Therefore, the arm portion 253 is rotatably supported by the support portion 251A so as to be interlocked with the rotation of the first end portion 251F of the seat surface portion 251a. Note that the arm portion 253 and the seat surface portion 251a are not limited to a configuration in which they rotate about the first rotation axis 251B via the fixture 251C. For example, the arm portion 253 and the seat surface portion 251a may be directly rotatably attached to the first rotation axis 251B. In the present embodiment, the arm portion 253 and the seat surface portion 251a may rotate in conjunction with each other.

[0031] Therefore, the seat surface portion 251a and the arm portion 253 rotate in conjunction with each other about the first rotation axis 251B. That is, the position of the arm portion 253 varies according to the rotation of the seat surface portion 251a.

[0032] Further, in the present embodiment, the rice transplanter 1 includes a seating sensor 43 that detects the posture of the driver's seat 25. Specifically, the seating sensor 43 detects the posture of the driver's seat 25 based on the position of the arm portion 253. The operation of the seating sensor 43 will be described later. The seating sensor 43 is an example of a detection unit.

[0033] In this embodiment, the arm portion 253 and the seat surface portion 251a are connected via the support portion 251A. Therefore, the vibration of the seat surface portion caused by the distortion and deflection of the seat 251 is transmitted from the seat surface portion 251a to the arm portion 253 via the support portion 251A. Generally, the farther the distance from the vibration source, the smaller the influence of the vibration and the smaller the vibration swing. In other words, even if the seat 251 is distorted or deflected, the arm portion 253 is less likely to be distorted or deflected. That is, the arm portion 253 has a smaller change in posture compared to the seat 251. Therefore, the seating sensor 43 can stably detect the position of the arm portion 253 compared to the case of detecting the position of the seat 251. Thus, in the rice transplanter 1 of this embodiment, the seating of the driver can be stably detected.

[0034] Furthermore, as shown in FIG. 4, the rice transplanter 1 further has a bar-shaped bar 254. The bar 254 is connected to the arm portion 253 and extends in the left-right direction of the traveling machine body 10 (the vehicle body portion 11). The bar 254 is an example of an extension portion. Typically, the bar 254 is formed of the same material as the arm, but may be formed of a different material from the arm. The bar 254 is provided at a position corresponding to the seating sensor 43 in the front-rear direction.

[0035] Therefore, the seating sensor 43 detects the posture of the driver's seat 25 based on the position of the bar 254 connected to the arm portion 253. As described above, even if the posture of the seat 251 changes particularly in the left-right direction, the posture of the bar 254 in the left-right direction is less likely to change. Therefore, by providing the bar 254 extending in the left-right direction on the arm portion 253, the influence of the change in the posture of the seat 251 in the left-right direction can be reduced, and the seating of the driver can be stably detected.

[0036] More specifically, the arm portion 253 has a first arm portion 253A and a second arm portion 253B. The first arm portion 253A is located on the left side in the left-right direction of the traveling body 10 (the vehicle body portion 11). The second arm portion 253B is located on the right side in the left-right direction of the traveling body 10 (the vehicle body portion 11). That is, the first arm portion 253A and the second arm portion 253B are positioned facing each other at a distance from each other in the left-right direction. The first arm portion 253A and the second arm portion 253B are bent so as to approach each other while extending rearward, but the shapes of the first arm portion 253A and the second arm portion 253B are not particularly limited.

[0037] The bar 254 connects the first arm portion 253A and the second arm portion 253B. Specifically, the bar 254 connects the rear end portion of the first arm portion 253A and the rear end portion of the second arm portion 253B. In other words, the left end portion of the bar 254 is connected to the rear end portion of the first arm portion 253A, and the right end portion of the bar 254 is connected to the rear end portion of the second arm portion 253B. In this way, the bar 254 is supported by the first arm portion 253A and the second arm portion 253B. Therefore, the posture of the bar 254 in the left-right direction is more stable, and the accuracy of detecting the position of the arm portion 253 by the seating sensor 43 can be improved.

[0038] Next, with reference to FIGS. 4 to 6, the detection of seating by the seating sensor 43 will be described. FIG. 5 is a view showing the internal state of the seat base 252 when no driver is seated on the driver's seat 25. FIG. 6 is a view showing the internal state of the seat base 252 when a driver is seated on the driver's seat 25. FIGS. 5 and 6 are views of the seat base 252 seen from the left side. In FIGS. 5 and 6, the first arm portion 253A and the like are omitted to show the inside of the seat base 252.

[0039] As described above, the seat surface portion 251a and the arm portion 253 rotate in conjunction with each other about the first rotation axis 251B with respect to the seat base 252. Further, the driver's seat 25 has two buffer members 70 and two springs 80. The two buffer members 70 and the two springs 80 are provided between the seat surface portion 251a and the seat base 252. The two springs 80 bias the seat surface portion 251a upward. Specifically, each of the two springs 80 includes a first end portion 801 on the seat surface portion 251a side and a second end portion 802 on the seat base 252 side. The first end portion 801 contacts the lower surface of the seat surface portion 251a. The second end portion 802 contacts the upper surface of the seat base 252. The two springs 80 are an example of an elastic member. The two springs 80 are positioned opposite to each other at a distance in the left-right direction. Specifically, the spring 80A is positioned on the left side of the arm portion 253 in the seat base 252. On the other hand, the spring 80B is positioned on the right side of the arm portion 253 in the seat base 252.

[0040] The two buffer members 70 are positioned opposite to each other at a distance in the left-right direction. Specifically, the buffer member 70A is positioned on the left side of the seat base 252 where the spring 80A is located. On the other hand, the buffer member 70B is positioned on the right side of the seat base 252 where the spring 80B is located. The two buffer members 70 support the second end portion 251R side of the seat surface portion 251a.

[0041] In the present embodiment, the position of the driver's seat 25 (seat surface portion 251a) with no driver seated on the driver's seat 25 is described as the first position P1.

[0042] In this embodiment, the seating sensor 43 is a potentiometer. Typically, the seating sensor 43 is disposed on the seat base 252 which is a part of the vehicle body portion 11, and is located rearwardly away from the support portion 251A. For example, the seating sensor 43 is provided between the first arm portion 253A and the second arm portion 253B, rearwardly of the midpoint position between the first end portion 251F and the second end portion 251R of the seat surface portion 251a of the seat base 252. By disposing the seating sensor 43 on the second end portion 251R side which is farther from the first rotation axis 251B than the first end portion 251F, the stroke amount of the seat surface portion 251a (arm portion 253) for pushing the rotary switch 432 described later can be ensured. Therefore, the detection accuracy of the seating sensor 43 can be improved.

[0043] Also, generally, in a work vehicle such as the rice transplanter 1, a fuel tank is provided below the driver's seat 25. Typically, the fuel tank filler opening is located below the seat surface portion 251a of the driver's seat 25. When the seating sensor 43 is disposed on the second end portion 251R side which is farther from the first rotation axis 251B than the first end portion 251F, the seating sensor 43 can be disposed avoiding the fuel tank filler opening. Therefore, it becomes possible to detect the driver's seating on the driver's seat 25 while ensuring good access to the fuel tank filler opening.

[0044] Specifically, the seating sensor 43 includes a variable resistance portion 431, a rotary switch 432, and a signal input / output portion 433. The rotary switch 432 rotates in the rotation direction D1 (downward) or the rotation direction D2 (upward) about the rotation center 432C. The rotation direction D1 and the rotation direction D2 are opposite to each other. The variable resistance portion 431 changes its electrical resistance value according to the position of the rotary switch 432. For example, the lateral width of the rotary switch 432 is shorter than the lateral width of the bar 254.

[0045] A predetermined voltage is applied to the variable resistance portion 431 via the signal input / output portion 433. The signal input / output portion 433 outputs an electrical signal indicating the voltage Vo corresponding to the electrical resistance value of the variable resistance portion 431 to the control portion 50.

[0046] As shown in FIG. 5, when the driver's seat 25 is in the first position P1, the seating sensor 43 is disposed on the seat base 252 with the tip of the rotary switch 432 facing rearward. At this time, the position of the rotary switch 432 is defined as the first position Pc1. The signal input / output unit 433 outputs an electrical signal indicating a voltage V0 corresponding to the electrical resistance value corresponding to the first position Pc1 of the variable resistance unit 431 to the control unit 50. The control unit 50 determines whether a driver is seated on the driver's seat 25 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 no driver is seated on the driver's seat 25 when the voltage V0 is greater than the threshold value.

[0047] On the other hand, as shown in FIG. 6, when a driver sits on the driver's seat 25 in the first position P1, a load is applied to the driver's seat 25 (seat surface portion 251a) according to the weight of the driver. As a result, the seat surface portion 251a rotates in the rotation direction D1 (downward) together with the fixture 251C about the first rotation axis 251B. Hereinafter, the position of the driver's seat 25 (seat surface portion 251a) with the driver seated on the driver's seat 25 is referred to as the second position P2.

[0048] At this time, the arm portion 253 rotates in the rotation direction D1 (downward) in conjunction with the seat surface portion 251a. As a result, the bar 254 contacts the upper surface side of the rotary switch 432, and further presses the rotary switch 432 downward. In other words, the rotary switch 432 is pressed downward by the bar 254. As a result, the rotary switch 432 rotates by a predetermined angle in the rotation direction D1 and moves to the second position Pc2. The signal input / output unit 433 outputs an electrical signal indicating a voltage V1 corresponding to the electrical 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 electrical signal received from the signal input / output unit 433 with a threshold value, and determines that a driver is seated on the driver's seat 25 when the voltage V1 is less than the threshold value.

[0049] Also, when the driver leaves the driver's seat 25, the two springs 80 extend vertically by the elastic force to lift the seat surface portion 251a upward. As a result, the seat surface portion 251a rotates in the rotational direction D2 together with the fixture 251C about the first rotation axis 251B and moves to the first position P1. At this time, the arm portion 253 rotates in the rotational direction D2 in conjunction with the seat surface portion 251a, and the bar 254 moves away from the rotary switch 432. In this state, the rotary switch 432 rotates in the rotational direction D2 by the action of an internal spring (not shown, for example) and moves to the first position Pc1.

[0050] Next, the two springs 80 of the present embodiment will be described. Hereinafter, one of the springs 80A and 80B will be described as the spring 80 representatively.

[0051] As shown in FIGS. 4 to 6, the spring 80 is disposed obliquely with respect to the vertical direction. More specifically, the end portion located on the upper side of the spring 80 is located in front of the end portion located on the rear side of the spring 80. That is, the spring 80 has a forwardly inclined posture upward. The inclination angle of the spring 80 is not particularly limited, but an angle parallel to the tangent direction of the midpoint between the first end portion 801 and the second end portion 802 of a circle having a radius of the distance from the first rotation axis 251B to the spring 80 about the first rotation axis 251B is preferable. Thereby, the expansion and contraction direction of the spring 80 and the movement direction of the seat surface portion 251a with respect to the seat base 252 overlap, making it difficult for the spring 80 to buckle and difficult for the spring 80 to deteriorate.

[0052] In addition, in the present embodiment, the arm portion 253 further has a contact portion 255. The contact portion 255 contacts the lower surface of the seat surface portion 251a behind the support portion 251A. As an example, the contact portion 255 is a protrusion that protrudes upward from the upper surface of the arm portion 253. For example, when mud or the like clogs the first rotation shaft 251B and the seat surface portion 251a and the arm portion 253 cannot rotate about the first rotation shaft 251B, if the contact portion 255 is in contact with the lower surface of the seat surface portion 251a, the load from above applied to the seat surface portion 251a is transmitted to the arm portion 253 via the contact portion 255. As a result, the arm portion 253 moves slightly downward, and the bar 254 can push the rotary switch 432.

[0053] Note that the shape of the contact portion 255 is not limited to a protrusion. For example, the entire upper surface of the arm portion 253 may be the contact portion 255. That is, the entire upper surface of the arm portion 253 may contact the lower surface of the seat surface portion 251a.

[0054] In the present embodiment, the seating sensor 43 is provided on the seat base 252 and configured to detect the position of the arm portion 253. However, the present invention is not limited to this, and the seating sensor 43 may be provided on the arm portion 253. In this case, depending on the rotary switch 432 of the seating sensor 43 and the position of the arm portion, the seating sensor 43 is pushed or not pushed by the seat base 252. Thus, also in the seating sensor 43 provided on the arm portion 253, the position of the arm portion is detected.

[0055] 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-described embodiments, and can be implemented in various aspects without departing from the gist thereof. In addition, the plurality of components disclosed in the above embodiments can be modified as appropriate. For example, a component among all the components shown in one embodiment may be added to the components of another embodiment, or some of the components among all the components shown in one embodiment may be deleted from the embodiment.

[0056] In addition, for the purpose of facilitating the understanding of the invention, the drawings schematically show each component mainly, and the thickness, length, number, interval, etc. of each illustrated component may be different from the actual ones for convenience in drawing preparation. Also, it goes without saying that the configuration of each component shown in the above embodiments is an example and is not particularly limited, and various modifications can be made without substantially departing from the effects of the present invention.

[0057] Note that this technology can be configured as follows. (1) A work vehicle that travels in a field, a vehicle body part, a seat disposed on the vehicle body part, a detection part that detects the posture of the seat, and is provided with, the seat includes, a seat surface portion on which the driver sits, a support portion that supports a first end portion on the front side of the seat surface portion, an arm portion that extends rearward from the support portion, and has, the support portion, rotatably supports the first end portion such that a second end portion on the rear side of the seat surface portion can move in the vertical direction, rotatably supports the front end portion of the arm portion such that the rear end portion of the arm portion can move in the vertical direction, the arm portion rotates in conjunction with the rotation of the first end portion of the seat surface portion, the detection part detects the posture of the seat based on the position of the arm portion. A work vehicle. (2) Further having an extension portion that is connected to the arm portion and extends in the left - right direction intersecting the front - rear direction of the vehicle body portion, the extension portion is provided at a position corresponding to the detection part in the front - rear direction. The work vehicle of (1). (3) The arm portion, a first arm portion located on one side in the left - right direction, a second arm portion located on the other side in the left - right direction, and has, the extension portion connects the first arm portion and the second arm portion. The work vehicle of (2).​​ (4) The detection unit is disposed on the vehicle body portion and is located rearward and away from the support portion, and is any one of the work vehicles according to (1) to (3). (5) The arm portion further has a contact portion that contacts the lower surface of the seat surface rearward of the support portion, and is any one of the work vehicles according to (1) to (4). (6) An elastic member is further provided between the seat surface and the vehicle body portion to bias the seat surface upward. An end portion of the elastic member on the seat surface side is located forward of an end portion of the elastic member on the vehicle body portion side, and is any one of the work vehicles according to (1) to (5).

Industrial Applicability

[0058] The present invention can be used in the field of work vehicles.

Explanation of Signs

[0059] 1 : Rice transplanter (work vehicle) 11 : Vehicle body portion 25 : Driver's seat (seat) 43 : Seating sensor (detection unit) 70, 70A, 70B : Buffer member 80, 80A, 80B : Spring (elastic member) 251A : Support portion 251F : First end portion 251R : Second end portion 251a : Seat surface 253 : Arm portion 253A : First arm portion 253B : Second arm portion 254 : Bar (extension portion) 255 : Contact portion 801 : First end portion 802 : Second end portion

Claims

1. A work vehicle that travels in a field, A vehicle body part, A seat disposed in the vehicle body portion; A detection unit that detects the posture of the seat; Equipped with The seat is A seat portion on which a driver sits; A support portion that supports a first end portion of the seat portion on a front side; an arm portion extending rearward from the support portion; having The support portion is A second end portion on a rear side of the seat portion supports the first end portion so as to be movable in the up and down direction, The rear end of the arm is supported so as to be movable in the up and down direction and the front end of the arm is supported so as to be rotatable, The arm portion rotates in conjunction with the rotation of the first end portion of the seat portion, The detection unit detects the posture of the seat based on the position of the arm.

2. The vehicle further includes an extension portion connected to the arm portion and extending in a left-right direction intersecting with the front-rear direction of the vehicle body portion, The work vehicle according to claim 1 , wherein the extension portion is provided at a position corresponding to the detection portion in the front-rear direction.

3. The arm portion is A first arm portion located on one side in the left-right direction; a second arm portion located on the other side in the left-right direction; having The work vehicle according to claim 2 , wherein the extension portion connects the first arm portion and the second arm portion.

4. The work vehicle according to claim 1 , wherein the detection unit is disposed on the vehicle body portion and positioned rearwardly and away from the support portion.

5. The work vehicle according to claim 1 , wherein the arm portion further includes a contact portion that is located rearward of the support portion and that contacts a lower surface of the seat portion.

6. The seat further includes an elastic member provided between the seat portion and the vehicle body portion and biasing the seat portion upward, The work vehicle according to claim 1 , wherein an end of the elastic member on the side of the seat portion is located forward of an end of the elastic member on the side of the vehicle body portion.

Images