Work vehicle

Abstract

To provide a work vehicle capable of preventing work travel using a work device while a sub-transmission remains in a high-speed state.SOLUTION: A work vehicle includes: a traveling device driven by power from a prime mover part; a work device capable of performing ground work; a main transmission capable of changing the power output from the prime mover part; and a sub-transmission capable of switching the power output from the main transmission between a first transmission state being the transmission state for work with the work device and a second transmission state being the transmission state other than the first transmission state. The sub-transmission includes: detection units (51, 52, 53) that detect the transmission state; and notification units (55, 56, 57) that provide notifications when the work device is used to perform ground work and the detection units (51, 52, 53) detect that the transmission state is the second transmission state.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a work vehicle equipped with a work device capable of performing ground work, and capable of switching between a gear shift state for work by the work device and other gear shift states.

Background Art

[0002] As a conventional work vehicle, for example, as described in Patent Document 1, there is one equipped with a sub-transmission as a transmission capable of shifting between a low-speed state for work running by a work device and a high-speed state for moving running. Further, such a work vehicle is provided with a sub-transmission lever which is an operating tool for enabling the shift operation of the sub-transmission. The operator operates the sub-transmission lever to perform the shift operation of the sub-transmission.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In such a work vehicle, for example, when the work device is a seedling planting device, if the work is performed in the high-speed state, the vehicle speed of the work vehicle becomes too fast compared to the planting speed of the planting arm of the seedling planting device, so that inconveniences such as the planting arm damaging the field may occur. Therefore, when performing work running using the work device, the operator needs to operate the sub-transmission lever to set the sub-transmission to the low-speed state.

[0005] However, when the operator operates the sub-transmission lever to set the sub-transmission to the high-speed state during the movement to the field, the operator may not notice that the sub-transmission is in the high-speed state and may perform work running using the work device as it is.

[0006] Therefore, an object of the present invention is to provide a work vehicle capable of preventing the work traveling using the work device from being performed while the auxiliary transmission is in the high-speed state.

Means for Solving the Problems

[0007] The work vehicle of the present invention includes a traveling device that is operated by the power of a prime mover, a work device capable of performing ground work, a main transmission that can shift the power output from the prime mover, and the power output from the main transmission, which can be switched between a first shift state that is a shift state for work by the work device and a second shift state that is a shift state other than the first shift state, an auxiliary transmission, a detection unit that detects the shift state of the auxiliary transmission, and a notification unit that performs notification when it is detected by the detection unit that the shift state is the second shift state when performing ground work using the work device.

[0008] According to this invention, when performing ground work by the work device, when the shift state is the second shift state, that is, when it is not the first shift state that is the shift state for work by the work device, it is notified by the notification unit. By the notification, the occupant can know that the shift state is the second shift state. As a result, it is possible to prevent the work traveling using the work device from being performed while the auxiliary transmission is in the high-speed state.

[0009] In the present invention, the detection unit preferably has an upstream detection unit that detects the rotational speed of the power on the upstream side of the auxiliary transmission and a downstream detection unit that detects the rotational speed of the power on the downstream side of the auxiliary transmission, and the detection unit detects the shift state of the auxiliary transmission based on the detection result of the upstream detection unit and the detection result of the downstream detection unit.

[0010] According to this configuration, for example, as the upstream detection unit, a detection device for detecting the engine speed is used, and as the downstream detection unit, a detection device for detecting the rotational speed of the power of the rear wheels or the like is used, and it is possible to detect that the sub-transmission is in the second gear state. Therefore, it is not necessary to provide a sensor or the like on an operating tool or the like for switching the gear state of the sub-transmission, and it is possible to avoid changing the layout or the like around the operating tool in order to detect that the sub-transmission is in the second gear state.

[0011] In the present invention, it is preferable that the upstream detection unit is provided between the main transmission and the sub-transmission in the power transmission path, and the detection unit detects that the sub-transmission is in the second gear state when the temporarily low-speed state rotational speed calculated based on the reduction ratio of the sub-transmission in the first gear state from the rotational speed detected by the upstream detection unit is different from the detection result of the downstream detection unit.

[0012] According to this configuration, it is possible to detect the gear state of the sub-transmission by a simple process of comparing the temporarily low-speed state rotational speed with the detection result of the downstream detection unit.

[0013] In the present invention, it is preferable that the traveling device has left and right front wheels and left and right rear wheels, and the downstream detection unit detects the rotational speed of the rear wheels.

[0014] According to this configuration, with the detection device as the downstream detection unit, it is configured to detect that the transmission is in the second gear state. Generally, many work vehicles are provided with a detection device for detecting the rotational speed of the power of the rear wheels for detecting the vehicle speed. In such a work vehicle, it is not necessary to newly provide a detection device or the like, and it is possible to reduce costs and man-hours.

[0015] In the present invention, it is preferable that the detection unit has a downstream detection unit that detects the rotational speed of the power on the downstream side of the sub-transmission, and the detection unit detects that the sub-transmission is in the second gear state when the rotational speed detected by the downstream detection unit exceeds the working rotational speed that is a preset rotational speed.

[0016] According to this configuration, it is not necessary to provide a plurality of detection units for detecting the rotational speed of the power, which can suppress the cost and further suppress the power consumption for detecting the rotational speed.

[0017] In the present invention, it is preferable that the detection unit includes a speed detection unit for detecting a traveling speed, and when the traveling speed detected by the speed detection unit exceeds a working speed that is a preset speed, the detection unit detects that the sub-transmission is in the second transmission state.

[0018] According to this configuration, it becomes a configuration for detecting that the sub-transmission is in the second transmission state by using the speed detection unit. Generally, a work vehicle is often provided with a speed detection unit for detecting the rotational speed of the power of the rear wheels for detecting the vehicle speed. In such a work vehicle, it is not necessary to newly provide a detection device or the like, and the cost and man-hours can be suppressed.

[0019] In the present invention, it is preferable that a positioning device capable of receiving a radio wave signal from a positioning satellite and acquiring position information over time is provided, and the speed detection unit detects the traveling speed based on the position information acquired from the positioning device.

[0020] According to this configuration, in the case of a work vehicle equipped with a positioning device for automatic traveling, by detecting the traveling speed using the positioning device, it is not necessary to provide a device or the like for detecting a new traveling speed. In such a work vehicle, it is not necessary to newly provide a detection device or the like, and the cost and man-hours can be suppressed.

[0021] In the present invention, it is preferable that the work device is configured to be switchable between a work position for performing ground work and a non-work position different from the work position, and when the work device is switched from the non-work position to the work position and the detection unit detects that the transmission state is the second transmission state, the notification unit performs notification.

[0022] According to this configuration, when the working device is switched from the non-working position to the working position, if the shift state is the second shift state, it is notified. If it is notified before starting the working travel by the working device, the operator needs to switch to the first shift state after remembering the notification when starting the working travel. However, in the above configuration, since it is notified when starting the working travel by the working device, the operator only needs to switch to the first shift state immediately after being notified, and more preferably, it is possible to prevent the sub-transmission device from performing the working travel using the working device while remaining in the high-speed state.

[0023] In the present invention, the working device is configured to be switchable between a working position for performing ground work and a non-working position different from the working position. When it is detected by the detection unit that the shift state is the second shift state after a lapse of a predetermined time since the working device is switched from the non-working position to the working position, it is preferable that the notification unit performs notification.

[0024] According to this configuration, it becomes a configuration in which notification is made after a lapse of a predetermined time since the working device is switched to the working position. When starting the working travel by the working device, the operator may notice that it is in the second operation state, and in such a case, it is possible to prevent notification from being made.

[0025] In the present invention, when the clutch for the working device is engaged, it is preferable that the notification unit makes a notification when it is detected by the detection unit that the shift state is the second shift state.

[0026] According to this configuration, for example, when the clutch for the working device is engaged, rather than when the working device is in the working position for performing ground work, a configuration is adopted in which notification is made if it is in the second shift state. Depending on the operator, there may be a case where the vehicle travels intentionally in the second shift state from when the working device is placed in the working position for performing ground work until before the clutch for the working device is engaged, and in such a case, it is possible to prevent notification from being made.

Brief Description of the Drawings

[0027]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0028] The mode for carrying out the present invention will be described with reference to the drawings. In the following description, unless otherwise specified, the direction of arrow F in the drawings is defined as "front", the direction of arrow B as "rear", the direction of arrow L as "left", and the direction of arrow R as "right". Also, the direction of arrow U in the drawings is defined as "up" and the direction of arrow D as "down".

[0029] 〔Regarding the overall configuration of a riding type rice transplanter〕 Hereinafter, a riding type rice transplanter, which is an example of the work vehicle of the present embodiment, will be described. As shown in FIG. 1, the riding type rice transplanter is provided with right and left front wheels 2 and right and left rear wheels 3 as traveling devices on a vehicle body 1.

[0030] A transmission case 4 is provided at the front part of the vehicle body 1. A support frame 5 extending forward is connected to the transmission case 4. An engine E as a power source is supported on the support frame 5. The engine E is covered by a bonnet 6 provided at the front part of the vehicle body 1.

[0031] A floor 7 is provided from the right and left sides of the bonnet 6 to the rear side of the bonnet 6. A driver's seat 8 on which a passenger can sit is provided at the rear part of the floor 7. A steering handle 9 is provided on the front side of the driver's seat 8, and a shift lever 10 is provided on the left lateral side of the steering handle 9. Also, a sub-shift lever 11 is provided on the left side of the driver's seat 8.

[0032] At the rear of the vehicle body 1, a link mechanism 12 is provided. The link mechanism 12 extends rearward and is configured to be swingable vertically. The link mechanism 12 is provided with a hydraulic cylinder 13 for raising and lowering the link mechanism 12.

[0033] At the rear of the vehicle body 1, a fertilizer application device 14 for supplying fertilizer to the paddy field surface and a seedling planting device 15 capable of planting seedlings in the field as a working device capable of performing ground operations are provided. The seedling planting device 15 is configured to be switchable between a raised non-working state (working position) and a lowered working state (non-working position) by raising and lowering the link mechanism 12.

[0034] The seedling planting device 15 includes a rotary case 21 connected to the rear end of the link mechanism 12 and to which the driving force of the transmission shaft 16 is transmitted, a plurality of leveling floats 22, a seedling placement table 23 for placing mat-shaped seedlings, and a rotary type planting arm 24 operated by the driving force from the rotary case 21.

[0035] As shown in FIG. 1, a positioning device 17 capable of receiving radio wave signals from positioning satellites used in GNSS (Global Navigation Satellite System, such as GPS, GLONASS, Galileo, QZSS, BeiDou, etc.) and acquiring position information over time is provided. It is possible to acquire and store the traveling route during the seedling planting operation using the positioning device 17 and set it as a target traveling route parallel to the stored route. After setting the target traveling route in this way, the vehicle body 1 can be automatically driven along the target traveling route.

[0036] 〔Regarding the transmission system to the front and rear wheels〕 As shown in FIG. 2, the power output from the engine E provided at the front of the vehicle body 1 is transmitted to a hydrostatic continuously variable transmission 32 (corresponding to the "main transmission device" of the present invention) via a transmission belt 31.

[0037] Inside the mission case 33, a gear shift type sub-transmission 35 (corresponding to the "transmission" of the present invention) is provided. The power of the engine E is transmitted from the continuously variable transmission 32 via the transmission shaft 34 to the sub-transmission 35, and it is configured to be switchable between a low speed state (corresponding to the "first transmission state" of the present invention) which is a transmission state for work by the work device and a high speed state (corresponding to the "second transmission state" of the present invention) which is a transmission state for moving travel.

[0038] The power from the sub-transmission 35 is transmitted to the right and left front wheels 2 via the front wheel differential device 41. The power of the sub-transmission 35 is transmitted to the transmission shaft 39 of the rear axle case 37 via the transmission shaft 36, and is transmitted to the right and left rear wheels 3 via the right and left side clutches 40. With this configuration, the front wheels 2 and the rear wheels 3 which are the traveling devices are operated by the power of the engine E which is the power source part.

[0039] Inside the mission case 33, a brake 38 capable of braking the transmission shaft 36 is provided, and the front wheels 2 and the rear wheels 3 can be braked by the brake 38.

[0040] The continuously variable transmission 32 can be manually operated steplessly from the neutral position to the forward side and the reverse side by the shift lever 10 (see FIG. 1).

[0041] The switching operation between the low speed state and the high speed state of the sub-transmission 35 is performed by manually operating the sub-shift lever 11 (see FIG. 1). The sub-shift lever 11 is of a type that rocks back and forth and is configured to be a position holding type that can hold the position switched between the low speed position for work travel and the high speed position for moving travel. The sub-shift lever 11 is linked to an operation shaft (not shown) of the sub-transmission 35 via a mechanical linkage mechanism (not shown) for sub-shifting. When the sub-shift lever 11 is operated to the low speed position, the sub-transmission 35 switches to the low speed state for work travel, and when the sub-shift lever 11 is operated to the high speed position, it switches to the high speed state for moving travel.

[0042] By operating the steering handle 9 (see FIG. 1), the front wheels 2 can be steered from the straight-ahead position across the right and left steering limits.

[0043] When the front wheel 2 is steered to the right steering limit side beyond the right set angle, the right side clutch 40 is operated to the cut-off state. Thereby, power is transmitted to the left and right front wheels 2 and the left rear wheel 3, and the right rear wheel 3 rotates freely, so that the vehicle body 1 turns to the right.

[0044] When the front wheel 2 is steered to the left steering limit side beyond the left set angle, the left side clutch 40 is operated to the cut-off state. Thereby, power is transmitted to the right and left front wheels 2 and the right rear wheel 3, and the left rear wheel 3 rotates freely, so that the vehicle body 1 turns to the left.

[0045] 〔Regarding the transmission system to the seedling planting device〕 As shown in FIG. 2, in the transmission case 33, the power output from the continuously variable transmission 32 and branched from the transmission shaft 34 is transmitted to the seedling planting device 15 via the inter-row transmission 42, the planting clutch 26, and the PTO shaft 43.

[0046] The power branched from the continuously variable transmission 32 is transmitted to the inter-row transmission 42 via the transmission shaft 25. The inter-row transmission 42 is a hydrostatic transmission similar to the continuously variable transmission 32, and is configured to be able to continuously vary the rotational power transmitted to the inter-row transmission 42. The power varied by the inter-row transmission 42 is transmitted to the seedling planting device 15 via the planting clutch 26.

[0047] When the planting clutch 26 is operated to the transmission state, power is transmitted to the seedling planting device 15 via the PTO shaft 43. The power transmitted to the seedling planting device 15 branches into two systems and is transmitted to the rotary case 21 and the lateral feed transmission 44. Due to the power transmitted to the rotary case 21, the rotary case 21 is rotationally driven and the planting arm 24 performs the planting operation. Due to the power transmitted to the lateral feed transmission 44, a lateral feed shaft (not shown) is rotationally driven, and the seedling table 23 is reciprocally laterally fed by the lateral feed shaft. While the seedling table 23 is reciprocally laterally fed left and right, the planting arm 24 takes out the seedlings and plants them in the field.

[0048] When the planting clutch 26 is operated to the disengaged state, power is not transmitted to the seedling planting device 15, and the seedling table 23 and the planting arm 24 stop.

[0049] 〔Regarding detection of the shift state of the auxiliary transmission〕 As shown in FIGS. 2 and 3, a detection unit 50 for detecting the shift state of the auxiliary transmission 35 is provided. As sensors constituting the detection unit 50, an upstream sensor 51 (corresponding to the "upstream detection unit" of the present invention) for detecting the rotational speed of the power on the upstream side of the auxiliary transmission 35 and a downstream sensor 52 (corresponding to the "downstream detection unit" of the present invention) for detecting the rotational speed of the power on the downstream side of the auxiliary transmission 35 are provided. Note that an electromagnetic pickup type or the like can be adopted for the upstream sensor 51 and the downstream sensor 52.

[0050] The vehicle body 1 is provided with a control unit C. The control unit C is constituted by a microprocessor including, for example, a CPU and an EEPROM. The control unit C is provided with a detection control unit 53 for controlling the upstream sensor 51 and the downstream sensor 52. In the present embodiment, the detection unit 50 is constituted by the upstream sensor 51, the downstream sensor 52, and the detection control unit 53.

[0051] In the present embodiment, the upstream sensor 51 detects the rotational speed of the transmission shaft 34 that transmits the power output from the continuously variable transmission 32. Further, the downstream sensor 52 detects the rotational speed of the transmission shaft 39 of the rear axle case 37, that is, the rotational speed of the rear wheels 3. The detection results of the upstream sensor 51 and the downstream sensor 52 are input to the detection control unit 53.

[0052] Note that the upstream sensor 51 is provided between the continuously variable transmission 32 and the auxiliary transmission 35 in the power transmission path. Therefore, the rotational speed of the power detected by the upstream sensor 51 is the rotational speed of the power before being shifted by the auxiliary transmission 35, and the rotational speed of the power detected by the downstream sensor 52 is the rotational speed of the power after being shifted by the auxiliary transmission 35.

[0053] Here, let the reduction ratio of the sub-speed change device 35 in the low-speed state be Rr. When the sub-speed change lever 11 is operated to the low-speed position and the sub-speed change device 35 is in the low-speed state, the value calculated by multiplying the rotational speed Xa of the power detected by the upstream sensor 51 by the value of the reduction ratio Rr, that is, the value calculated by the formula "Xa × Rr", is substantially the same as the value of the rotational speed Xb of the power detected by the downstream sensor 52. Hereinafter, the calculated value is referred to as the "temporary low-speed state rotational speed". On the other hand, when the sub-speed change lever 11 is operated to the high-speed position and the sub-speed change device 35 is in the high-speed state, the temporary low-speed state rotational speed calculated by multiplying the rotational speed Xa of the power detected by the upstream sensor 51 by the value of the reduction ratio Rr is different from the value of the rotational speed Xb of the power detected by the downstream sensor 52.

[0054] That is, in the present embodiment, the detection control unit 53 determines whether the sub-speed change device 35 is in the high-speed state or the low-speed state by comparing the detection result of the upstream sensor 51 with the detection result of the downstream sensor 52. With this configuration, the detection unit 50 detects that the sub-speed change device 35 is in the high-speed state or the low-speed state based on the detection result of the upstream sensor 51 and the detection result of the downstream sensor 52. At this time, as described above, the detection unit 50 calculates the temporary low-speed state rotational speed based on the reduction ratio of the sub-speed change device 35 in the low-speed state from the detection result of the upstream sensor 51, and detects by comparing the difference between the temporary low-speed state rotational speed and the detection result of the downstream sensor 52. In the present embodiment, when the detection result of the downstream sensor 52 is substantially the same as the temporary low-speed state rotational speed, it is detected that the sub-speed change device 35 is in the low-speed state, and when the detection result of the downstream sensor 52 is different from the temporary low-speed state rotational speed, it is detected that the sub-speed change device 35 is in the high-speed state.

[0055] 〔Regarding the notification unit〕 As shown in FIGS. 2 and 3, when performing ground work using the seedling planting device 15 (working device), there is provided a notification unit 55 that notifies the operator when the detection unit 50 detects that the sub-speed change device 35 is in the high-speed state.

[0056] As shown in FIGS. 1 and 3, the notification unit 55 includes a notification control unit 56 provided in the control unit C and a sound generation device 57 such as a buzzer device that notifies the passengers by sound. The mounting position of the sound generation device 57 may be any position where the emitted sound can be heard by the passengers, such as near the driver's seat 8, and is not particularly limited.

[0057] 〔Control Flow〕 The detection control unit 53 and the notification control unit 56 are configured to perform control according to the control flow shown in FIG. 4.

[0058] When the seedling planting device 15, which is a working device, is switched from the ascending non-working state to the descending working state, the detection control unit 53 executes a detection process using the upstream sensor 51 and the downstream sensor 52 (step S01). The detection of the switching of the seedling planting device 15 from the ascending non-working state to the descending working state may be detected using a sensor provided in the operating device that performs the switching operation, a sensor that detects the ascending and descending of the seedling planting device 15, etc., and the mode of the detection method is not particularly limited.

[0059] When the detection unit 50 detects that the sub-transmission device 35 is in the high-speed state (step S02: Yes), the notification control unit 56 executes a notification to the passengers (generates a sound with the sound generation device 57) (step S03).

[0060] When the detection unit 50 detects that the sub-transmission device 35 is not in the high-speed state (step S02: No), the process ends as it is.

[0061] 〔Another Embodiment〕 Hereinafter, another embodiment in which changes are made to the above embodiment will be exemplified.

[0062] (1) In the above embodiment, the detection unit 50 was described by taking as an example the configuration in which it detects that the sub-transmission 35 is in the high-speed state or the low-speed state based on the detection results of the upstream sensor 51 and the downstream sensor 52. However, the present invention is not limited to the above embodiment. For example, it may be configured such that when the rotational speed detected by the downstream sensor 52 exceeds a preset predetermined rotational speed (corresponding to the "working rotational speed" of the present invention), it is detected that the sub-transmission 35 is in the high-speed state.

[0063] Further, instead of the upstream sensor 51 and the downstream sensor 52, the detection unit 50 may include a device (corresponding to the "speed detection unit" of the present invention) that detects the traveling speed of the vehicle body 1. The detection unit 50 may be configured to detect that the sub-transmission 35 is in the high-speed state when the traveling speed detected by the sensor exceeds a preset predetermined speed (corresponding to the "working speed" of the present invention). At this time, when the positioning device 17 (see FIG. 1) is used as the device for detecting the traveling speed of the vehicle body 1, the detection unit 50 may be configured to detect the traveling speed based on the position information acquired from the positioning device 17.

[0064] Also, the detection unit 50 may be configured to detect that the sub-transmission lever 11 has been operated to the high-speed position or the low-speed position and detect that the sub-transmission 35 is in the high-speed state. At this time, it may be configured to detect that the sub-transmission lever 11 has been operated to the high-speed position or the low-speed position by using a potentiometer or a switch that is pressed when the sub-transmission lever 11 is operated to the high-speed position or the low-speed position.

[0065] (2) In the above embodiment, the configuration in which detection processing and notification are executed when the seedling planting device 15 is switched from the raised non-working state to the lowered working state was described by taking it as an example. However, the present invention is not limited to the above embodiment. After a predetermined time has elapsed since the seedling planting device 15 is switched from the raised non-working state to the lowered working state, if the detection unit 50 executes detection processing and detects that the sub-transmission 35 is in the high-speed state, the notification unit 55 may be configured to perform notification.

[0066] (3) In the above embodiment, the configuration in which the detection process and notification are executed when the seedling planting device 15 is switched from the ascending non-operating state to the descending operating state has been described as an example. However, the present invention is not limited to the above embodiment. When the planting clutch 26 (corresponding to the "clutch for the working device" of the present invention) is operated to engage, the detection process by the detection unit 50 is executed, and when it is detected that the sub-transmission 35 is in the high-speed state, the notification unit 55 may be configured to perform notification.

[0067] (4) In the above embodiment, the plant-spacing transmission 42 has been described as an example of a hydrostatic transmission. However, the present invention is not limited to the above embodiment, and the plant-spacing transmission 42 may be a gear-type stepped transmission.

[0068] (5) In the above embodiment, the detection control unit 53 has been described as an example of a configuration that executes a detection process using the upstream sensor 51 and the downstream sensor 52 when the seedling planting device 15, which is a working device, is switched from the ascending non-operating state to the descending operating state. However, the present invention is not limited to the above embodiment. For example, the fertilizer applicator 14 may be used as the working device, or when a chemical spraying device for spraying chemicals such as herbicides on the field is provided, the chemical spraying device may be used as the working device.

[0069] (6) A back clutch may be provided upstream of the plant-spacing transmission 42, which is operated to a transmission state when the shift lever 10 is operated to the neutral position and the forward side, and is operated to a cutoff state when the shift lever 10 is operated to the reverse side.

[0070] (7) In the above embodiment, the configuration in which the detection control unit 53 and the notification control unit 56 are provided in the control unit C has been described as an example. However, the detection control unit 53 and the notification control unit 56 may each be configured by a separate microprocessor.

[0071] Furthermore, the configurations disclosed in the above embodiments (including other embodiments, the same applies hereinafter) can be applied in combination with the configurations disclosed in other embodiments as long as there is no contradiction. Also, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited thereto, and can be appropriately modified within the scope not departing from the object of the present invention.

Industrial Applicability

[0072] The present invention can be applied to a work vehicle equipped with a work device capable of performing ground operations and capable of switching between a speed change state for work by the work device and other speed change states.

Explanation of Reference Numerals

[0073] 2: Front wheels (traveling device) 3: Rear wheels (traveling device) 15: Seedling planting device (work device) 17: Positioning device 32: Continuously variable transmission (main transmission) 35: Sub transmission 50: Detection unit 51: Upstream sensor (upstream detection unit) (detection unit) 52: Downstream sensor (downstream detection unit) (detection unit) 53: Detection control unit (detection unit) 55: Notification unit 56: Notification control unit (notification unit) 57: Sound generation device (notification unit) E: Engine (prime mover)

Claims

1. A traveling device that operates by the power of a prime mover, A working device capable of performing ground operations, A main transmission device capable of changing the speed of the power output from the prime mover, A sub-transmission device that can switch the power output from the main transmission device between a first transmission state, which is a transmission state for work by the working device, and a second transmission state, which is a transmission state other than the first transmission state, The sub-transmission device includes a detection unit that detects the transmission state, A work vehicle provided with a notification unit that performs notification when it is detected by the detection unit that the transmission state is the second transmission state when performing ground work using the working device.

2. The detection unit has an upstream detection unit that detects the rotational speed of the power on the upstream side of the sub-transmission device and a downstream detection unit that detects the rotational speed of the power on the downstream side of the sub-transmission device, The detection unit is the work vehicle according to claim 1, wherein the sub-transmission device detects the transmission state based on the detection result of the upstream detection unit and the detection result of the downstream detection unit.

3. The upstream detection unit is provided between the main transmission device and the sub-transmission device in the power transmission path, The detection unit is the work vehicle according to claim 2, wherein when the pseudo-low speed state rotational speed calculated based on the reduction ratio of the sub-transmission device in the first transmission state from the rotational speed detected by the upstream detection unit is different from the detection result of the downstream detection unit, it is detected that the sub-transmission device is in the second transmission state.

4. The traveling device has left and right front wheels and left and right rear wheels, The downstream detection unit is the work vehicle according to claim 2, which detects the rotational speed of the rear wheels.

5. The detection unit has a downstream detection unit that detects the rotational speed of the power on the downstream side of the sub-transmission device, The detection unit is the work vehicle according to claim 1, wherein when the rotational speed detected by the downstream detection unit exceeds a preset working rotational speed, it is detected that the sub-transmission device is in the second transmission state.

6. The detection unit has a speed detection unit that detects the traveling speed, The detection unit is the work vehicle according to claim 1, wherein when the traveling speed detected by the speed detection unit exceeds a preset working speed, it is detected that the sub-transmission device is in the second transmission state.

7. A positioning device that receives radio signals from positioning satellites and can acquire position information over time is provided. The work vehicle according to claim 6, wherein the speed detection unit detects the traveling speed based on the position information acquired from the positioning device. **Claim 8** The working device is configured to be switchable between a working position for performing ground work and a non-working position different from the working position. When the detection unit detects that the shift state is the second shift state when the working device is switched from the non-working position to the working position, the notification unit performs notification. The work vehicle according to any one of claims 1 to 7. **Claim 9** The working device is configured to be switchable between a working position for performing ground work and a non-working position different from the working position. When the detection unit detects that the shift state is the second shift state after a predetermined time has elapsed since the working device was switched from the non-working position to the working position, the notification unit performs notification. The work vehicle according to any one of claims 1 to 6. **Claim 10** When the clutch for the working device is engaged, the notification unit performs notification when the detection unit detects that the shift state is the second shift state. The work vehicle according to any one of claims 1 to 7.

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