Work vehicle

Abstract

To provide an art suitable for a work vehicle including a positioning device.SOLUTION: An exemplary work vehicle includes: a cabin; and a quantum compass provided at the cabin.SELECTED DRAWING: Figure 5

Description

[Technical Field]

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

[0002] Conventionally, work vehicles equipped with a function for acquiring vehicle position information for the purposes of autonomous driving, recording work information, or theft prevention have been known. Positioning satellites have conventionally been used to acquire vehicle position information. Patent Document 1 discloses a work vehicle equipped with a positioning unit that acquires information (satellite information) from positioning satellites. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-54408 Summary of the Invention [Problem to be solved by the invention]

[0004] In a configuration that uses satellite information to obtain the vehicle's position information, the accuracy of the acquired position information can be reduced due to the influence of the communication environment. Furthermore, the operating environment of a work vehicle is harsher than that of a normal automobile, for example, there is a lot of dust and dirt, and vibrations during driving tend to be large. In other words, when installing a positioning device on a work vehicle, it is necessary to take into account the harsh operating environment, etc.

[0005] An object of the present invention is to provide a technology suitable for a work vehicle equipped with a positioning device. [Means for solving the problem]

[0006] An exemplary work vehicle of the present invention includes a cabin and a quantum compass provided in the cabin. [Effects of the Invention]

[0007] According to the exemplary work vehicle of the present invention, it is possible to appropriately acquire position information by suppressing the influence of the communication environment, the harsh working environment, and the like. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a side view showing a schematic configuration of a work vehicle; [Figure 2] FIG. 1 is a plan view showing a schematic configuration of a work vehicle; [Figure 3] FIG. 1 is a perspective view showing a schematic configuration of a cabin base that constitutes a cabin. [Figure 4] A side view showing the general configuration of the cabin base [Figure 5] FIG. 1 is a side view showing a first embodiment of the quantum compass arrangement; [Figure 6] FIG. 1 is a front view showing a first embodiment of the quantum compass arrangement; [Figure 7] FIG. 10 is a side view showing a schematic diagram of a second embodiment relating to the arrangement of a quantum compass. [Figure 8] FIG. 10 is a front view showing a second embodiment of the quantum compass arrangement; [Figure 9] FIG. 10 is a front view schematically showing a third embodiment relating to the arrangement of a quantum compass. [Figure 10] Schematic cross-sectional view taken along the line XX in Figure 9 [Figure 11] FIG. 10 is a plan view schematically showing a fourth embodiment relating to the arrangement of a quantum compass; [Figure 12] Schematic cross-sectional view taken along the line XII-XII in Figure 11 [Figure 13] 5 is a cross-sectional view showing a schematic diagram of a fifth embodiment relating to the arrangement of a quantum compass. [Figure 14] 6 is a cross-sectional view showing a schematic diagram of a sixth embodiment relating to the arrangement of a quantum compass. [Figure 15] FIG. 10 is a side view showing a schematic configuration of a work vehicle according to another embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0010] The work vehicle according to an embodiment of the present invention is a tractor. However, this is merely an example. The work vehicle may be an agricultural work machine other than a tractor, such as a combine harvester. The work vehicle may also be a work machine for civil engineering or construction work, or a work machine other than an agricultural work machine, such as a snowplow.

[0011] In addition, directions are defined as follows in this specification. First, the direction in which a tractor serving as a work vehicle travels during work is defined as "forward," and the opposite direction is defined as "rear." Furthermore, the right side of the tractor as viewed in the direction of travel during work is defined as right, and the left side is defined as left. The direction perpendicular to the front-to-back and left-to-right directions of the tractor is defined as up-to-down. In this case, the direction of gravity is defined as down, and the opposite side is defined as up. Furthermore, the plane perpendicular to the up-to-down direction is defined as the horizontal plane, and the direction along the horizontal plane is defined as the horizontal direction. Note that the above directions are simply names used for the purpose of explanation and are not intended to limit the actual positional relationships or directions.

[0012] <1. Overview of the work vehicle> Fig. 1 is a side view showing the general configuration of a work vehicle 1 according to an embodiment of the present invention. Fig. 2 is a plan view showing the general configuration of a work vehicle 1 according to an embodiment of the present invention. As shown in Figs. 1 and 2, the work vehicle 1 comprises a vehicle body 2, wheels 3, a prime mover 4, and a power transmission unit 5.

[0013] As shown in Figures 1 and 2, the wheels 3 have front wheels 3a and rear wheels 3b. The front wheels 3a are arranged on the left and right sides of the front of the vehicle body 2. The rear wheels 3b are arranged on the left and right sides of the rear of the vehicle body 2. The vehicle body 2 is provided so that it can travel using the front wheels 3a and rear wheels 3b. In other words, the work vehicle 1 of this embodiment is a wheeled tractor. However, the work vehicle 1 is not limited to a wheeled tractor, and may also be a crawler-type tractor that travels using crawlers.

[0014] The prime mover 4 is disposed in the front of the vehicle body 2 and is covered by a hood 6. In this embodiment, the prime mover 4 is an engine. The engine may be, for example, a diesel engine, a gasoline engine, a hydrogen engine, or a gas engine. However, the prime mover 4 may be something other than an engine, such as a motor.

[0015] The power transmission unit 5 is disposed behind the prime mover 4. The power transmission unit 5 transmits the power of the prime mover 4 to the wheels 3. Specifically, the power of the prime mover 4 is transmitted to at least one of the front wheels 3a and the rear wheels 3b via the power transmission unit 5. In this embodiment, the power of the prime mover 4 is transmitted to the front wheels 3a and the rear wheels 3b via the power transmission unit 5. Specifically, the power transmission unit 5 has a transmission case 212 in which a transmission is disposed. In addition to or instead of the transmission case 212, the power transmission unit 5 may have at least one of a power transmission shaft, a gear, a pulley, a belt, a chain, a reducer, and a case that houses such power transmission elements, for example.

[0016] The vehicle body 2 has a base portion 21 to which the wheels 3 are attached, and a riding portion 22 supported by the base portion 21. In other words, the work vehicle 1 is equipped with the base portion 21 and the riding portion 22.

[0017] More specifically, the base portion 21 has a base frame 211, a transmission case 212 included in the power transmission portion 5, a front axle 213, and a rear axle 214. Front wheels 3a are attached to the front axle 213. Rear wheels 3b are attached to the rear axle 214. The transmission case 212 and the front axle 213 are attached to the base frame 211. The rear axle 214 is attached to the transmission case 212. The base frame 211 supports the prime mover 4.

[0018] The riding section 22 is the portion of the vehicle body 2 on which the driver (operator) rides, and is provided behind the prime mover 4. The riding section 22 is also provided above the power transmission section 5. In this embodiment, the riding section 22 has an interior space (room-type space) in which the driver rides. That is, in this embodiment, the riding section 22 is a so-called cabin. The work vehicle 1 is equipped with the cabin 22. The cabin 22 is supported by the base section 21.

[0019] 2, some of the members that make up the cabin 22, such as the roof 225 (see FIG. 1) and windshield (a type of transparent member 226), have been removed so that the interior of the cabin 22 can be seen. As shown in FIG. 2, a seat section 221, a steering section 222, and a dashboard section 223 are provided inside the cabin 22. In other words, the work vehicle 1 is equipped with the seat section 221, the steering section 222, and the dashboard section 223.

[0020] The seat section 221 is where the driver of the work vehicle 1 sits. The steering section 222 constitutes a device that allows the driver sitting in the seat section 221 to steer the work vehicle 1. More specifically, the steering section 222 has a steering wheel 222a and a steering column 222b. The steering wheel 222a is the part that is operated by the driver and is configured in a circular shape. The steering wheel 222a is rotatably supported by a steering shaft (not shown) that is arranged inside the steering column 222b that is located below the steering wheel 222a. By rotating the steering wheel 222a, the direction of the front wheels 3a can be changed.

[0021] The dashboard section 223 is provided at the front of the cabin 22. More specifically, at least a portion of the dashboard section 223 is disposed in front of the steering column 222b. The dashboard section 223 is provided with a meter panel (instrument board) that visualizes values ​​measured by various instruments, including the speed of the work vehicle 1, and various levers, switches, etc. for operating the work vehicle 1.

[0022] Inside the cabin 22, levers, pedals, etc. are arranged around the seat 221 for operating the work vehicle 1 itself and the work equipment (not shown) attached to the rear of the work vehicle 1. Inside the cabin 22, an operation unit 224 used to cause the work vehicle 1 to travel autonomously is also arranged in front of the seat 221. The operation unit 224 makes it possible to start autonomous travel and set the conditions for autonomous travel. Note that autonomous travel means that at least steering is performed autonomously, with devices related to travel being controlled by a control device (not shown). In autonomous travel, in addition to steering, for example, at least one of adjusting vehicle speed and performing work using a work equipment may be performed autonomously.

[0023] A work implement coupling section 8, which is configured, for example, by a three-point linkage mechanism, is provided at the rear of the vehicle body 2. The work implement coupling section 8 is provided so that a work implement can be attached and detached. Only one type of work implement may be attached to the work implement coupling section 8, but preferably multiple types are attached. Examples of work implements include cultivators, plows, fertilizer applicators, pesticide sprayers, harvesters, and reapers. A lifting device (none of which are shown) having a hydraulic device such as a lifting cylinder is provided at the rear of the vehicle body 2. The lifting device raises and lowers the work implement coupling section 8, thereby raising and lowering the work implement attached to the work implement coupling section 8. The power generated by the prime mover 4 can be transmitted to the work implement via a power take-off shaft (PTO shaft; not shown) extending from the power transmission section 5 toward the rear of the vehicle body 2. In other words, the work implement can be operated by the prime mover 4. The work implement may be driven by a drive device (for example, a motor) separate from the prime mover 4.

[0024] <2. Cabin Configuration> The configuration of the cabin 22 provided in the work vehicle 1 will be described in further detail. Fig. 3 is a perspective view showing the general configuration of the cabin base 220 that constitutes the cabin 22. Note that Fig. 3 shows not only the cabin base 220 but also a seat section 221 attached to the cabin base 220.

[0025] The cabin base 220 is a part that forms the base of the cabin 22. The above-mentioned seat section 221, steering section 222, dashboard section 223, etc. are arranged on the cabin base 220. As shown in Fig. 3 , the cabin base 220 has a cabin frame 2201, a floor 2202, a cabin front wall 2203, a cabin rear wall 2204, and left and right cabin side walls 2205.

[0026] The cabin frame 2201 forms the framework of the cabin 22. That is, the work vehicle 1 is equipped with the cabin frame 2201 that constitutes the cabin 22. The cabin 22 has the cabin frame 2201. A floor 2202, a cabin front wall 2203, a cabin rear wall 2204, and left and right cabin side walls 2205 are attached to the cabin frame 2201.

[0027] The floor 2202 forms the floor surface of the cabin 22. In other words, the floor 2202 forms the bottom wall of the cabin 22. The floor 2202 may be made up of a single member (floor member), but in this embodiment, it is made up of a plurality of members (floor members). The seat section 221 is supported by the floor 2202. A floor mat may be placed on at least a portion of the upper surface of the floor 2202.

[0028] The cabin front wall 2203 is erected in the center in the left-right direction at the front end of the cabin 22. More specifically, the cabin front wall 2203 is a partition wall that prevents high-temperature air inside the hood 6 from flowing into the cabin 22. In other words, the cabin front wall 2203 is a so-called air cut plate.

[0029] The cabin rear wall 2204 is disposed behind the seat 221 so as to face the rear surface of the seat 221. The cabin rear wall 2204 extends upward from the rear end of the floor 2202. The left and right cabin side walls 2205 are disposed on the left and right sides of the seat 221.

[0030] Note that openings exist on the top, front, rear, left and right side surfaces of the cabin base 220 shown in Figure 3. A roof 225 (see Figure 1) is disposed in the opening on the top surface. That is, the cabin 22 has a roof 225. Transparent members 226 (see Figure 1) such as glass are disposed in each opening on the front, rear, left and right side surfaces. Some of the transparent members 226 disposed on the left and right side surfaces form doors for the driver to enter and exit the cabin 22.

[0031] Fig. 4 is a side view showing a schematic configuration of the cabin base 220. Fig. 4 also shows a part of the base portion 21 (see Fig. 1, etc.) that supports the cabin base 220. As shown in Fig. 4, the cabin base 220 is supported on the base portion 21 via the vibration-isolating member 10. That is, the cabin 22 is supported on the base portion 21 via the vibration-isolating member 10. The vibration-isolating member 10 is, for example, a member made of rubber.

[0032] In detail, the vibration-damping member 10 is arranged between (in the vertical direction) the base portion 21 and the cabin base portion 220 that is supported from below by the base portion 21. The vibration-damping effect of the vibration-damping member 10 can prevent vibrations (traveling vibrations) that occur as the work vehicle 1 travels from being transmitted to the cabin 22. In other words, the vibration-damping effect of the vibration-damping member 10 can prevent electrical components and the like arranged in the cabin 22 from shaking due to traveling vibrations.

[0033] <3. Quantum Compass> [3-1. Overview] As described above, in this embodiment, the work vehicle 1 is configured to be capable of autonomous driving. To enable the work vehicle 1 to drive autonomously, position information of the vehicle (host vehicle) is required. To be able to acquire the host vehicle's position information, the work vehicle 1 of this embodiment is equipped with a quantum compass 11 (see FIG. 5, etc., described later). The quantum compass 11 is a positioning device. Note that in this embodiment, the work vehicle 1 is configured to be equipped with a quantum compass 11 for acquiring position information in order to enable autonomous driving, but this is merely an example. For example, the work vehicle 1 may be equipped with a quantum compass that enables acquisition of position information for other purposes, such as recording work information by the work vehicle 1 or preventing theft of the work vehicle 1.

[0034] The quantum compass 11 is an electrically powered electrical component capable of measuring latitude and longitude. The quantum compass 11 is attached to the work vehicle 1 as an electrical component. The quantum compass 11 is not subject to restrictions on placement related to communication, as is the case when satellite information is used to acquire position information. For this reason, the quantum compass 11 does not need to be placed on the top of the work vehicle 1, and can also be placed inside the cabin. However, because the quantum compass 11 is an electrical component, it is required to be placed on the work vehicle 1 in a manner that does not expose it to, for example, rain, mud, exhaust fumes, etc. Taking these points into consideration, in this embodiment, the quantum compass 11 is placed in a devised manner. A detailed example of the placement of the quantum compass 11 will be described later.

[0035] In this embodiment, the work vehicle 1 is provided with one quantum compass 11. However, the work vehicle 1 may be provided with multiple quantum compasses 11. For example, two quantum compasses 11 may be arranged symmetrically front to back or left to right, and multiple quantum compasses 11 may be used for attitude control of the work vehicle 1.

[0036] Before describing a detailed example of how the quantum compass 11 is arranged, an overview of the arrangement of the quantum compass 11 will be given.

[0037] In this embodiment, the quantum compass 11 is provided in the cabin 22. The quantum compass 11 may be located inside or outside the cabin 22. As described above, the cabin 22 is supported by the base 21 to which the wheels 3 are attached via the vibration-isolating member 10 (see FIG. 4), and has a vibration-proof structure. That is, in this embodiment, the quantum compass 11 is placed in the cabin 22, which has a vibration-proof structure. For this reason, in this embodiment, it is possible to prevent a decrease in the measurement accuracy of the quantum compass 11 due to vibrations caused by the work vehicle 1 while traveling.

[0038] Furthermore, the cabin 22 is provided in a location surrounded by the front, rear, left, and right wheels 3 (four wheels 3) in a plan view (see FIG. 2, etc.). For this reason, by providing the quantum compass 11 in the cabin 22, the quantum compass 11 can be placed in a location surrounded by the four wheels 3 in a plan view. In other words, the quantum compass 11 can be placed in a position with a small deviation from the control point of the work vehicle 1 during autonomous driving. As a result, it is possible to control autonomous driving by reducing the error in measuring the vehicle's position using the quantum compass 11. The control point during autonomous driving is, for example, the center position of the four wheels 3.

[0039] As can be seen from the above, it is preferable that the quantum compass 11 be placed in a position where the positional deviation from the control point during autonomous driving is small. In this sense, it is preferable that the quantum compass 11 be placed on the bisector (center line) CL (see FIG. 2) that bisects the work vehicle 1 in the left-right direction in a planar view. In other words, it is preferable that the quantum compass 11 be placed in the center of the vehicle in the left-right direction in a planar view. By configuring it in this way, it is possible to reduce the positional deviation of the quantum compass 11 from the control point during autonomous driving, and it is possible to prevent the process of determining the vehicle's position using the quantum compass 11 from becoming complicated. In other words, it is possible to simplify the control process for autonomous driving.

[0040] In this embodiment, as a preferred embodiment, the quantum compass 11 is disposed around the roof 225 of the cabin 22. Placing the quantum compass 11 in such a position makes it difficult for people to come into contact with the quantum compass 11. Specifically, it is possible to prevent passengers in the work vehicle 1 from accidentally coming into contact with the quantum compass 11. Furthermore, by disposing the quantum compass 11 in such a position, the quantum compass 11 is placed in a position that is difficult to see from the outside, and therefore deterioration of the interior design of the cabin 22 can be suppressed.

[0041] [3-2. Detailed example of how to arrange the quantum compass] Hereinafter, the arrangement of the quantum compass 11 will be described with reference to several examples.

[0042] (3-2-1. First Example) Fig. 5 is a side view showing a first embodiment relating to the arrangement of quantum compass 11. Fig. 6 is a front view showing a first embodiment relating to the arrangement of quantum compass 11. Fig. 5 is a schematic side view of cabin 22. Fig. 6 is a view of the periphery of roof 225 as seen from the front (front side).

[0043] In the first embodiment, the quantum compass 11 is supported by the cabin frame 2201. With this configuration, the quantum compass 11 can be supported by a highly rigid member. The quantum compass 11 may be supported by the cabin frame 2201 directly or indirectly.

[0044] In this embodiment, the quantum compass 11 is attached to the cabin frame 2201 via the support member 12. That is, the quantum compass 11 is indirectly supported by the cabin frame 2201. By using a configuration in which the support member 12 is interposed, it is possible to improve the degree of freedom in layout when mounting the quantum compass 11 in the cabin 22.

[0045] In this embodiment, as shown in FIGS. 5 and 6 , the support member 12 includes a frame portion 121, a pair of left and right pedestal portions 122, and a central plate portion 123. The frame portion 121 includes a rod-shaped portion 121a extending in the left-right direction and legs 121b provided at both left and right ends of the rod-shaped portion 121a and extending downward. Each of the pair of left and right pedestal portions 122 is fixed to the upper left and right ends of the front end portion of the cabin frame 2201. With the left and right legs 121b fixed to the pedestal portions 122, the frame portion 121 is erected in an inverted U shape at the upper front portion of the cabin 22. The central plate portion 123 is fixed to the upper side of the center of the rod-shaped portion 121a in the left-right direction. Note that the configuration of the support member 12 described above is merely an example and may be modified as appropriate.

[0046] The quantum compass 11 is attached to the support member 12 while housed in the case 13. In Figures 5 and 6, the quantum compass 11 is shown with a dashed line because it is housed in the case 13 and is not normally visible. This method of displaying the quantum compass 11 may also be used in other figures. The case 13 is preferably a waterproof case that has a function to prevent water from entering the case. Furthermore, the case 13 preferably has an openable and closable lid for ease of maintenance, etc. By configuring the quantum compass 11 to be housed in the case 13, the quantum compass 11, which is placed outside the cabin 22, can be protected from rainwater, etc.

[0047] Specifically, case 13 housing quantum compass 11 is fixed to the upper surface of center plate portion 123. Case 13 is preferably fixed to center plate portion 123 using a removable fastener such as a bolt. Case 13 housing quantum compass 11 is disposed above the front part of cabin 22. Furthermore, case 13 housing quantum compass 11 is disposed in the center of the vehicle in the left-right direction in a plan view.

[0048] As can be seen from the above, in this embodiment, the quantum compass 11 is disposed in the center of the vehicle in the left-right direction in a plan view. The quantum compass 11 is also disposed in the front part of the cabin 22. Therefore, in a plan view, the quantum compass 11 can be disposed near a control point for autonomous driving (for example, the center of the four wheels 3), and the process of determining the vehicle position using the quantum compass 11 can be prevented from becoming complicated.

[0049] Furthermore, in this embodiment, the quantum compass 11 is disposed above the cabin frame 2201. This configuration can prevent passengers such as the driver from accidentally coming into contact with the quantum compass 11. Although the quantum compass 11 is disposed outside the cabin 22, it is housed in the case 13, making it less susceptible to the effects of rainwater, dust, and the like.

[0050] (3-2-2. Second Example) FIG. 7 is a side view schematically showing a second embodiment relating to the arrangement of the quantum compass 11. FIG. 8 is a front view schematically showing a second embodiment relating to the arrangement of the quantum compass 11. FIG. 7 is a schematic side view of the cabin 22. FIG. 8 is a front view of the periphery of the roof 225. In the second embodiment, the quantum compass 11 is housed in the case 13 and arranged above the front of the cabin 22 (cabin frame 2201), as in the first embodiment. In describing the second embodiment, explanations of content common to the first embodiment will be omitted as much as possible.

[0051] In the second embodiment, the quantum compass 11 is supported by the roof 225. The roof 225 refers to the roof portion of the cabin 22. By configuring the quantum compass 11 to be supported by the roof 225, it is possible to prevent passengers such as the driver from accidentally coming into contact with the quantum compass 11. The roof 225 is attached to the cabin frame 2201.

[0052] In this embodiment, the quantum compass 11 supported by the roof 225 is disposed outside the cabin 22, but it may also be disposed inside the cabin 22, and such an example will be described later. In this embodiment, the quantum compass 11 is disposed at the front of the roof 225. However, this is an example, and the quantum compass 11 may be disposed at another position on the roof 225, such as the center of the roof 225. However, disposing the quantum compass 11 at the front of the roof 225 has the advantage that, in a plan view, the quantum compass 11 can be disposed near a control point for autonomous driving (for example, the center of the four wheels 3).

[0053] The quantum compass 11 may be supported directly or indirectly by the roof 225, but in this embodiment, the quantum compass 11 is indirectly supported by the roof 225. The quantum compass 11 is supported by the roof 225 via a support member 12A. This allows for greater freedom in layout when installing the quantum compass 11 in the cabin 22.

[0054] In this embodiment, as shown in Figures 7 and 8, the support member 12A has a pair of left and right support pieces 124 and a mounting plate 125 in the shape of a rectangular plate extending in the left-right direction. In a plan view, the pair of left and right support pieces 124 are arranged symmetrically with respect to a center line CL (see Figure 2) that bisects the work vehicle 1 in the left-right direction. The lower end of each support piece 124 is fixed to the roof 225 and extends upward from the roof 225. The mounting plate 125 is fixed to each upper end of the pair of left and right support pieces 124. Note that the configuration of the support member 12A described above is merely an example and may be modified as appropriate.

[0055] Quantum compass 11 is attached to support member 12A while housed in case 13. Specifically, case 13 housing quantum compass 11 is fixed to the upper surface of mounting plate 125. Case 13 is preferably fixed to mounting plate 125 using a detachable fastener such as a bolt. Quantum compass 11 is located in the center of the vehicle in the left-right direction in a plan view.

[0056] (3-2-3. Third Example) FIG. 9 is a front view showing a third embodiment relating to the arrangement of the quantum compass 11. FIG. 10 is a schematic cross-sectional view taken along the line XX in FIG. 9. FIG. 9 is a front view of the area around the roof 225. In the third embodiment, the quantum compass 11 is housed in the case 13 and arranged above the front of the cabin 22 (cabin frame 2201), as in the first and second embodiments. In describing the third embodiment, explanations of content common to the first and second embodiments will be omitted as much as possible.

[0057] In the third embodiment, the configuration of support member 12B to which case 13 containing quantum compass 11 is attached is generally similar to that of the second embodiment. Support member 12B has a pair of left and right support pieces 124B and a rectangular mounting plate 125B extending in the left-right direction. However, unlike the second embodiment, in the third embodiment, support piece 124B is fixed not to roof 225 but to cabin frame 2201, at least a portion of which is located below the upper surface of roof 225. With this configuration, support member 12B can be attached to a highly rigid member, thereby firmly supporting quantum compass 11.

[0058] In this embodiment, the support piece portion 124B is configured to be directly attached to the cabin frame 2201, but the support piece portion 124B may be attached to a mounting seat attached to the cabin frame 2201.

[0059] In this embodiment, since the support piece portion 124B penetrates the upper surface of the roof 225, an opening 225a is provided in the upper surface of the roof 225. To prevent water, dust, and the like from entering the inside of the cabin 22 through the opening 225a, it is preferable that a grommet 126 be disposed in the opening 225a, as shown in Fig. 10 etc. Note that it is preferable that the grommet 126 is a waterproof grommet that has at least a waterproof function.

[0060] (3-2-4. Fourth Example) FIG. 11 is a plan view schematically illustrating the arrangement of the quantum compass 11 according to the fourth embodiment. FIG. 12 is a schematic cross-sectional view taken along line XII-XII in FIG. 11. FIG. 11 is a view of the roof 225 as seen from above. In the fourth embodiment, the quantum compass 11 is housed in the case 13 and arranged outside the cabin 22, similar to the first, second, and third embodiments. In the fourth embodiment, the quantum compass 11 is supported by the roof 225, similar to the second embodiment. In describing the fourth embodiment, explanations of content common to the first to third embodiments will be omitted as much as possible.

[0061] In this embodiment, roof 225 has a recess 225c recessed downward on its upper surface 225b. Case 13 housing quantum compass 11 is placed in recess 225c. Case 13 placed in recess 225c may be fixed directly to roof 225, as shown in FIG. 12, or may be fixed to roof 225 via a mounting seat provided in recess 225c.

[0062] In this embodiment, because the case 13 is disposed within the recess 225c, at least a portion of the quantum compass 11 supported by the roof 225 is disposed below the upper surface 225b of the roof 225. In the example shown in Fig. 12, a portion of the quantum compass 11 is disposed at a position lower than the upper surface 225b of the roof 225, but the entire quantum compass 11 may also be disposed at a position lower than the upper surface 225b of the roof 225. With this configuration, the height of the work vehicle 1 on which the quantum compass 11 is disposed on the roof 225 can be lowered.

[0063] The recess 225c is preferably provided in the center of the roof 225 in the left-right direction. The recess 225c is preferably provided as close to the front as possible of the roof 225. In this embodiment, the recess 225c is provided on the upper surface 225b of the roof 225, but an opening penetrating in the vertical direction may be provided instead of the recess 225c. In this case, it is necessary to provide a mounting seat on the roof 225 for mounting the case 13.

[0064] (3-2-5. Fifth Example) Fig. 13 is a cross-sectional view schematically showing a fifth embodiment relating to the arrangement of the quantum compass 11. Fig. 13 is a longitudinal cross-sectional view of the roof 225. In the first to fourth embodiments, the quantum compass 11 is arranged outside the cabin 22. Unlike these embodiments, in the fifth embodiment, the quantum compass 11 is arranged inside the cabin 22. In describing the fifth embodiment, explanations of content common to the first to fourth embodiments will be omitted as much as possible.

[0065] As shown in FIG. 13 , the quantum compass 11 is disposed inside the roof 225. Specifically, the roof 225 has an outer roof 2251 and an inner roof 2252. The quantum compass 11 is disposed between the outer roof 2251 and the inner roof 2252. By disposing the quantum compass 11 inside the roof 225, the quantum compass 11 can be protected from rainwater and the like without being housed in a case. This also prevents passengers such as the driver from accidentally coming into contact with the quantum compass 11. Furthermore, the quantum compass 11 can be disposed in an out-of-sight location, improving the design of the cabin 22.

[0066] The outer roof 2251 forms the outer surface of the cabin 22. More specifically, the outer roof 2251 forms the upper surface of the cabin 22. The inner roof 2252 is disposed below the outer roof 2251 with a gap therebetween. The inner roof 2252 forms the inner surface of the cabin 22. More specifically, the inner roof 2252 forms the ceiling of the interior of the cabin 22. The outer roof 2251 and the inner roof 2252 are attached to the cabin frame 2201. The roof 225 shown in the first to fourth embodiments may also have an outer roof and an inner roof.

[0067] It is preferable that quantum compass 11 be supported by a support member provided on at least one of outer roof 2251 and inner roof 2252. This improves the mounting strength of quantum compass 11. In this embodiment, quantum compass 11 is supported by support member 12C provided on outer roof 2251.

[0068] The support member 12C has a support main body portion 127 that is U-shaped in cross section, and fixing portions 128 that extend outward in the left-right direction from the left and right upper ends of the support main body portion 127. The support member 12C is attached to the outer roof 2251 by fixing the left and right fixing portions 128 to the underside of the outer roof 2251. The support member 12C may be fixed to the outer roof 2251 using fixing devices such as bolts, for example. The quantum compass 11 is fixed to the upper surface of the support main body portion 127 using fixing devices such as bolts or adhesive, for example.

[0069] The configuration of the support member 12C is merely an example and may be modified as appropriate. The quantum compass 11 disposed inside the roof 225 is preferably provided in the center in the left-right direction of the work vehicle 1. The quantum compass 11 disposed inside the roof 225 is preferably provided as close to the front of the roof 225 as possible.

[0070] (3-2-6. Sixth Example) Fig. 14 is a cross-sectional view schematically showing a sixth embodiment relating to the arrangement of quantum compass 11. Fig. 14 is a vertical cross-sectional view of roof 225. In the sixth embodiment, quantum compass 11 is arranged inside roof 225, as in the fifth embodiment. In explaining the sixth embodiment, explanations of content common to the first to fifth embodiments will be omitted as much as possible.

[0071] 14, in this embodiment, the quantum compass 11 is disposed between the outer roof 2251 and the inner roof 2252 in the vertical direction via a support member 12D, as in the fifth embodiment. However, unlike the fifth embodiment, in this embodiment, the support member 12D is supported by the cabin frame 2201, not the roof 225. In other words, the quantum compass 11 is supported by the cabin frame 2201 inside the roof 225. With this configuration, the quantum compass 11 can be supported by a member with higher rigidity than the roof 225, and the quantum compass 11 can be firmly supported.

[0072] Specifically, the support member 12D extends in the left-right direction, and its left and right ends are fixed to the cabin frame 2201. This fixation may be achieved using fasteners such as bolts. For example, the support member 12D may be fixed to the cabin frame 2201 together with the outer roof 2251 using the same bolts. The support member 12D is a beam-like member and may also be referred to as a beam bracket. The quantum compass 11 is fixed to the underside of the support member 12D using fasteners such as bolts or adhesive. Note that the configuration of the support member 12D is merely illustrative and may be modified as appropriate. For example, the support member 12D may have a shape similar to that of the support member 12C of the fifth embodiment. In this case, the quantum compass 11 may be fixed to the upper surface of the support member.

[0073] <4. Another embodiment> Next, an embodiment different from the embodiment described above will be described. In describing the embodiment different from the embodiment described above, the description of the content that overlaps with the above embodiment will be omitted as much as possible.

[0074] In the embodiment described above, the quantum compass 11 is configured to be provided in the cabin 22. However, among the work vehicles 1, there are also types of work vehicles that do not include a cabin 22.

[0075] Figure 15 is a side view showing the general configuration of a work vehicle 1A of another embodiment. The work vehicle 1A shown in Figure 15 is also a tractor. The work vehicle 1A includes a vehicle body 2A and wheels 3A. The vehicle body 2A has a base section 21A including a transmission case and the like, and a riding section 22A supported by the base section 21A. A seat section 221A, a steering section 222A and the like are provided in the riding section 22A. The riding section 22A does not form a room and is exposed to the outside of the vehicle.

[0076] The riding section 22A is provided with a ROPS frame 7 located behind the seat section 221A. The ROPS frame 7 is gate-shaped (inverted U-shaped) when viewed from the front. The ROPS frame 7 has the function of protecting the driver in the event that the work vehicle 1A tips over. Like the seat section 221A, the ROPS frame 7 is supported by frame members that make up the riding section 22A.

[0077] In this embodiment, the quantum compass 11 is provided on the ROPs frame 7. The quantum compass 11 is supported by the ROPs frame 7. The quantum compass 11 may be attached directly to the ROPs frame 7, or may be attached indirectly. In this embodiment, the quantum compass 11 is attached to the ROPs frame 7 while housed in a case 13, which is preferably a waterproof case. More specifically, the case 13 housing the quantum compass 11 is attached to the upper frame constituting the gate-shaped ROPs frame 7 via a support member 12E. The case 13 is also attached to the ROPs frame 7 so that the quantum compass 11 is located in the center of the work vehicle 1 in the left-right direction. Note that the attachment location of the case 13 on the ROPs frame 7 is not limited to the location in this embodiment and may be changed as appropriate.

[0078] <5. Points to note> Various modifications can be made to the various technical features disclosed in this specification without departing from the spirit of the technical creation. Furthermore, multiple embodiments, examples, and modifications shown in this specification can be combined to the extent possible.

[0079] <6. Notes> An exemplary work vehicle of the present invention may have a configuration (first configuration) including a cabin and a quantum compass provided in the cabin.

[0080] The work vehicle of the first configuration may be configured (second configuration) to include a cabin frame that constitutes the cabin, and the quantum compass is supported by the cabin frame.

[0081] In the work vehicle of the second configuration, the quantum compass may be attached to the cabin frame via a support member (third configuration).

[0082] In the work vehicle of the second or third configuration, the quantum compass may be configured (fourth configuration) to be disposed above the cabin frame.

[0083] In the work vehicle of the first configuration, the cabin may have a roof, and the quantum compass may be supported by the roof (fifth configuration).

[0084] In the work vehicle of the fifth configuration, the quantum compass may be arranged at the front of the roof (sixth configuration).

[0085] The work vehicle of the fifth or sixth configuration may be configured (seventh configuration) such that at least a portion of the quantum compass is disposed below an upper surface of the roof.

[0086] In the work vehicle of any one of the fifth to seventh configurations above, the quantum compass may be arranged inside the roof (eighth configuration).

[0087] In a work vehicle of any of the fifth to eighth configurations above, the roof may have an outer roof and an inner roof, and the quantum compass may be supported by a support member provided on at least one of the outer roof and the inner roof (ninth configuration).

[0088] In a work vehicle of any of the first to third configurations above, the cabin may have a cabin frame and a roof, and the quantum compass may be configured to be supported by the cabin frame inside the roof (tenth configuration).

[0089] In the work vehicle of any one of the first to tenth configurations above, the quantum compass may be configured (eleventh configuration) to be disposed in the center of the vehicle in the left-right direction in a plan view. [Explanation of symbols]

[0090] 1, 1A...Work vehicle 11. Quantum Compass 12, 12A, 12B, 12C, 12D, 12E... Support members 22. Cabin 225···Roof 2201···Cabin frame 2251···Outer roof 2252···Inner roof

Claims

1. The cabin and a quantum compass provided in the cabin; A work vehicle equipped with:

2. A cabin frame that configures the cabin is provided, The work vehicle according to claim 1 , wherein the quantum compass is supported by the cabin frame.

3. The work vehicle according to claim 2 , wherein the quantum compass is attached to the cabin frame via a support member.

4. The work vehicle according to claim 3 , wherein the quantum compass is disposed above the cabin frame.

5. the cabin has a roof, The work vehicle of claim 1 , wherein the quantum compass is supported on the roof.

6. The work vehicle according to claim 5 , wherein the quantum compass is disposed at a front portion of the roof.

7. The work vehicle according to claim 5 , wherein at least a portion of the quantum compass is positioned below an upper surface of the roof.

8. The work vehicle of claim 5 , wherein the quantum compass is disposed inside the roof.

9. The roof has an outer roof and an inner roof, The work vehicle according to claim 5 , wherein the quantum compass is supported by a support member provided on at least one of the outer roof and the inner roof.

10. The cabin has a cabin frame and a roof, The work vehicle according to claim 1 , wherein the quantum compass is supported by the cabin frame inside the roof.

11. The work vehicle according to claim 1 , wherein the quantum compass is disposed at a center portion in the left-right direction of the vehicle in a plan view.

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