Work vehicle

Abstract

Provided is a work vehicle wherein a GNSS reception unit can be suitably disposed.　The work vehicle comprises: a roof 200 constituting a ceiling portion of a cabin 100 and having an internal space R formed therein capable of accommodating an apparatus; and a GNSS reception unit 30 disposed in the internal space R and capable of receiving a GNSS signal.

Description

Work vehicles

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

[0002] BACKGROUND ART Conventionally, technology for a work vehicle equipped with a GNSS receiving unit capable of receiving signals (GNSS signals) from satellites has been publicly known, as described in, for example, Patent Document 1.

[0003] Patent Document 1 describes a tractor equipped with an antenna unit (GNSS receiver) that can detect the position of the vehicle body by receiving radio signals from positioning satellites that constitute a satellite positioning system. The antenna unit is attached to the front of the cabin roof. The antenna unit is attached to the cabin via a support frame so that it can rotate between a normal use position that protrudes above the cabin roof and a non-use position that is lower than the roof.

[0004] However, if the antenna unit is located in front of the roof of the cabin, as in the tractor described in Patent Document 1, there is a risk that the antenna unit and the support frame will obstruct the driver's view when looking forward and upward inside the cabin. Therefore, from the perspective of ensuring the driver's view, it is desirable to position the GNSS receiving unit in an appropriate location.

[0005] Patent No. 6640767

[0006] One aspect of the present disclosure has been made in consideration of the above-described circumstances, and the problem it aims to solve is to provide a work vehicle in which a GNSS receiving unit can be suitably positioned.

[0007] The problem to be solved by one embodiment of the present disclosure has been described above, and next, the means for solving this problem will be described.

[0008] A work vehicle according to one aspect of the present disclosure includes a roof that forms the ceiling of a cabin and has an interior space capable of accommodating equipment therein, and a GNSS receiving unit that is capable of receiving GNSS signals and is disposed in the interior space. According to one aspect of the present disclosure, the GNSS receiving unit can be disposed in an appropriate position.

[0009] According to one aspect of the present disclosure, the GNSS receiving unit is disposed on the front side of the roof. According to one aspect of the present disclosure, the GNSS receiving unit can be disposed in a position suitable for position detection.

[0010] According to one aspect of the present disclosure, the roof has an opening formed therein that opens to communicate with the interior space, and the roof is provided with a cover that can open and close the opening. According to one aspect of the present disclosure, it is possible to improve the ease of maintenance of the GNSS receiving unit.

[0011] According to one aspect of the present disclosure, the opening is formed in the upper surface of the roof in a shape that allows the GNSS receiving unit to pass through. According to one aspect of the present disclosure, maintenance of the GNSS receiving unit can be easily performed from the upper surface side of the roof.

[0012] A cabin according to one aspect of the present disclosure includes a cabin frame supporting the roof, and a support member fixed to the cabin frame in the interior space and supporting the GNSS receiving unit. According to one aspect of the present disclosure, the GNSS receiving unit can be preferably supported in the interior space of the roof.

[0013] The support member according to one aspect of the present disclosure includes a frame fixing portion fixed to the cabin frame, and an apparatus fixing portion detachably fixed to the frame fixing portion, to which the GNSS receiving unit is fixed, and formed in a shape that allows it to pass through the opening. According to one aspect of the present disclosure, the workability of attaching and detaching the support member can be improved.

[0014] According to one aspect of the present disclosure, the cabin includes a window frame that is fixed to the cabin frame and that can support a window when the window is provided in the roof, and the support member is fixed to the cabin frame via the window frame. According to one aspect of the present disclosure, the window frame can be used to attach a GNSS receiving unit.

[0015] The cover according to one aspect of the present disclosure includes a main body covering the opening from above, and a sidewall extending downward from an outer periphery of the main body, wherein a groove is formed around the opening in the roof, the groove having an opening that opens upward and into which the sidewall is inserted, and the groove is provided with a blocking portion that blocks a gap between the sidewall and the groove. According to one aspect of the present disclosure, it is possible to prevent water from entering through a gap between the cover and the opening.

[0016] According to one aspect of the present disclosure, the GNSS receiving unit can be suitably arranged.

[0017] A side view showing the overall configuration of a tractor according to an embodiment of the present disclosure. An exploded perspective view showing a cabin frame, roof, support member, and GNSS receiving unit of the tractor. An exploded perspective view showing a cabin frame, inner roof, support member, and GNSS receiving unit. An exploded perspective view showing a support member. An exploded perspective view showing an opening, cover portion, and closing portion of the outer roof. A side cross-sectional view showing the roof. A front cross-sectional view showing the roof. An enlarged front cross-sectional view showing the opening, groove portion, cover portion, and closing portion of the outer roof.

[0018] In the following description, the directions indicated by arrows U, D, F, B, L, and R in the figures are defined as upward, downward, forward, backward, leftward, and rightward, respectively.

[0019] First, the overall configuration of a tractor 1 according to an embodiment of the present disclosure will be described.

[0020] The tractor 1 shown in FIG. 1 mainly comprises a body frame 2, an engine 3, a hood 4, a transmission case 5, front wheels 6, rear wheels 7, fenders 8, a lifting device 9, a seat 20, a steering wheel 21, a cabin 100, and the like.

[0021] The body frame 2 is a frame-shaped member formed by appropriately combining a plurality of plate materials. The body frame 2 is formed in a generally rectangular shape when viewed from above. The body frame 2 is disposed at the front of the tractor 1 with its longitudinal direction facing the front-to-rear direction. An engine 3 is fixed to the rear of the body frame 2. The engine 3 is covered by a hood 4. A transmission case 5 is fixed to the rear of the engine 3. A muffler 4a that discharges exhaust gas from the engine 3 is disposed on the right side of the hood 4.

[0022] The front portion of the vehicle frame 2 is supported by a pair of left and right front wheels 6 via a front axle mechanism (not shown). The rear portion of the transmission case 5 is supported by a pair of left and right rear wheels 7 via a rear axle mechanism (not shown). The pair of left and right rear wheels 7 are generally covered from above by fenders 8.

[0023] A lifting device 9 is provided at the rear of the transmission case 5. Various types of implements (e.g., a tiller) can be attached to the lifting device 9. The lifting device 9 can raise and lower the attached implements using an actuator such as a hydraulic cylinder. Power from the engine 3 can be transmitted to the implements attached to the lifting device 9 via a PTO shaft (not shown).

[0024] The power of the engine 3 is changed in speed by a transmission (not shown) housed in a transmission case 5, and then can be transmitted to front wheels 6 via the front axle mechanism, and to rear wheels 7 via the rear axle mechanism. The front wheels 6 and rear wheels 7 are driven to rotate by the power of the engine 3, allowing the tractor 1 to travel. The power of the engine 3 can also be used to drive a work device attached to the lifting device 9.

[0025] A cabin 100 is provided behind the engine 3. The cabin 100 is mounted on the vehicle body (transmission case 5, etc.). A living space for a driver is formed inside the cabin 100. As shown in FIG. 1 , a seat 20 for the driver to sit on is disposed approximately in the center of the cabin 100. The cabin 100 is also provided with an auxiliary step 20a for getting on and off the seat 20. A steering wheel 21 for adjusting the turning angle of the front wheels 6 is also disposed in front of the cabin 100.

[0026] The cabin 100 is provided with a roof 200 that forms a ceiling (roof). The roof 200 is formed in a substantially rectangular shape in a plan view (see FIG. 2). The configurations of the cabin 100 and the roof 200 will be described in detail later.

[0027] The tractor 1 according to this embodiment also includes a GNSS receiving unit 30, a camera 40, and a radar unit 50.

[0028] The GNSS receiving unit 30 shown in Figures 2 and 3 is an antenna capable of receiving satellite signals (GNSS signals) transmitted from GNSS satellites. The GNSS receiving unit 30 constitutes a satellite positioning system (GNSS) such as GPS. The GNSS receiving unit 30 is formed in a substantially rectangular box shape. The GNSS receiving unit 30 is disposed in an internal space R of the roof 200, which will be described later (see Figures 6 and 7). The arrangement of the GNSS receiving unit 30 will be described in detail later.

[0029] The camera 40 shown in FIG. 1 is capable of capturing images of the area around the vehicle body. The tractor 1 can control the operation of the vehicle body based on images captured by the camera 40. For example, the tractor 1 can learn the appearance of a person based on the images captured by the cameras, and when the image capture results of each camera detect that a person is approaching the tractor 1, control can be performed to stop the tractor 1. Note that the use of each camera is not limited to this, and the captured images can be used for various purposes. Multiple cameras 40 are arranged around the cabin 100. The multiple cameras 40 are arranged in positions that allow them to capture images of the front, left and right sides, and rear of the vehicle body. Note that the camera 40 that captures images of the front of the vehicle body is not shown in FIG. 1.

[0030] The radar unit 50 shown in FIG. 1 is capable of detecting targets around the vehicle body using radio waves (e.g., millimeter waves). Examples of such targets include structures made of metal or concrete, other vehicles, and people. The radar unit 50 is equipped with a sensor (e.g., a millimeter wave sensor) that detects targets by emitting radio waves and receiving radio waves reflected by the targets. FIG. 1 shows an example in which the radar unit 50 is installed in front of the hood 4 of the tractor 1. The radar unit 50 is attached to the body of the tractor 1 (e.g., the front of the body frame 2) by a radar support member 60. The radar unit 50 can be installed not only in the front of the vehicle body (hood 4), but also in any location, such as on the left and right sides or rear of the vehicle body.

[0031] The GNSS receiver 30, camera 40, and radar unit 50 are connected via wiring to a suitable control device capable of controlling the travel of the tractor 1. The control device can detect vehicle body position information based on the GNSS signals received by the GNSS receiver 30. The control device can also execute control to automatically drive the tractor 1 (autonomous driving control) based on the position information, images captured by the camera 40, and detection results from the radar unit 50. The autonomous driving control includes, for example, control to automatically steer the vehicle body so that it travels straight and parallel to a predetermined travel reference line, control to automatically drive the vehicle body along a created target travel route, and control to automatically change speed or stop the vehicle. The control device can be disposed in various locations on the vehicle body, for example, other than the interior space R.

[0032] The configuration of the cabin 100 will be described below. The cabin 100 includes a cabin frame 110 that supports a roof 200. The cabin frame 110 shown in Figures 1 and 2 includes front pillars 111, rear pillars 112, a center pillar 113, a front beam 114, a rear beam 115, and side beams 116. Note that the pillars are not shown in Figure 2.

[0033] The front pillar 111 shown in Figure 1 supports the front portion of the roof 200. The rear pillar 112 supports the rear portion of the roof 200. The center pillar 113 supports the approximate center (middle portion) of the roof 200 in the fore-and-aft direction. The pillars (front pillar 111, rear pillar 112, and center pillar 113) are provided so as to be located on both the left and right sides of the cabin frame 110. Note that Figure 1 only shows the pillars on the left side.

[0034] The front beam 114 shown in Figures 1 and 2 connects the upper ends of the left and right front pillars 111. A windshield is provided within the frame formed by the front beam 114 and the left and right front pillars 111. The rear beam 115 shown in Figure 1 connects the upper ends of the left and right rear pillars 112 and the left and right center pillars 113. The side beam 116 connects the upper ends of the front pillars 111 and the center pillar 113. As shown in Figure 2, the side beams 116 are provided so as to be located on both the left and right sides of the cabin frame 110.

[0035] Each of the pillars and beams is formed to have a hollow shape. Wiring connected to devices (e.g., the GNSS receiver 30, the camera 40, the radar unit 50, etc.) provided on the tractor 1 can be inserted through the space inside each of the pillars and beams.

[0036] The cabin frame 110 is provided with a window frame 120 shown in Figures 2 and 3. The window frame frame 120 is capable of supporting a window portion (a window glass constituting a sunroof) when the window portion is provided in the roof 200. The window frame frame 120 is provided so as to be positioned in front of the roof 200. The window frame frame 120 can be installed, for example, forward of the center of the roof 200 in the fore-and-aft direction. Furthermore, the window frame frame 120 can be installed, for example, forward of the seat 20. Note that this embodiment shows an example in which no window portion is provided in the roof 200. The window frame frame 120 has a first portion 121 and a second portion 122.

[0037] The first portion 121 is capable of supporting the rear portion of the window portion. The first portion 121 is formed in a curved shape (arch shape) with a convex upper side to correspond to the shape of the roof 200 (see FIG. 3 ). The first portion 121 is disposed behind the front beam 114 so as to connect the left and right side beams 116 to each other. Both left and right ends of the first portion 121 are fixed to the middle portions of the left and right side beams 116 in the fore-and-aft direction (for example, approximately the center portions in the fore-and-aft direction), respectively.

[0038] The second portions 122 are capable of supporting both the left and right sides of the window portion. The second portions 122 are arranged to slope downward toward the front in accordance with the shape of the roof 200 (see FIG. 3 ). The second portions 122 are arranged to connect the front beams 114 and the first portion 121. The second portions 122 are provided so as to be positioned on both the left and right sides of the cabin frame 110. Both front-rear direction end portions of each second portion 122 are fixed to the front beams 114 and the first portion 121, respectively.

[0039] The window frame 120, together with the front beam 114, forms a frame capable of supporting the four periphery of the window. The front beam 114 can support the front of the window. The frame formed by the window frame 120 and the front beam 114 forms a substantially rectangular opening that is long in the left-right direction in a plan view. When a window is provided in the tractor 1, the window is attached to the window frame 120 and the front beam 114 so as to cover the opening.

[0040] The roof 200 will be described below. The roof 200 is supported by the cabin frame 110. The roof 200 is formed of a material (e.g., resin) that is less affected by communication by the GNSS receiving unit 30. The roof 200 includes an inner roof 210 and an outer roof 220.

[0041] 2 and 3 constitutes the underside of the roof 200 (the interior side of the cabin 100). The inner roof 210 is provided so as to cover from below the frame formed by the beams (front beam 114, rear beam 115, and side beam 116) of the cabin frame 110 (see FIG. 2).

[0042] As shown in Figures 3, 6, and 7, a recess 211 that is recessed downward is formed in the front portion of the inner roof 210. The recess 211 is formed in a position corresponding to the arrangement position of the GNSS receiving unit 30. Specifically, the recess 211 is formed in approximately the center in the left-right direction of the front portion of the inner roof 210. The recess 211 is formed so as to overlap, in plan view, with the frame opening formed by the window frame 120 and the front beam 114. The shape of the recess 211 in plan view is formed to correspond to the shape (approximately rectangular) of the GNSS receiving unit 30 in plan view.

[0043] The outer roof 220 forms the upper side of the roof 200 (the exterior side of the cabin 100). The outer roof 220 is provided to cover from above the frame formed by the beams (front beam 114, rear beam 115, and side beam 116) of the cabin frame 110 and the inner roof 210 (see FIG. 2). As shown in FIGS. 6 and 7, an internal space R is formed between the outer roof 220 and the inner roof 210. The GNSS receiving unit 30 is disposed in the internal space R. In addition, for example, an air conditioner, audio equipment, etc. are disposed in the internal space R. The outer roof 220 includes an opening 221, a groove 222, a cover 223, and a closing portion 224.

[0044] The opening 221 shown in Figures 5 to 7 is an opening formed on the upper surface of the outer roof 220 so as to communicate with the internal space R. The opening 221 is formed in approximately the center in the left-right direction in the front part of the outer roof 220. The opening 221 is formed so as to overlap, in a plan view, with the frame opening formed by the window frame 120 and the front beam 114, and the recess 211 (see Figures 6 and 7). The opening 221 is formed in a substantially rectangular shape that is elongated in the left-right direction. Furthermore, the opening 221 is formed in a shape that allows the GNSS receiving unit 30 (device fixing unit 320, described later) to pass through.

[0045] The groove 222 is a groove formed in the upper surface of the outer roof 220 so as to open upward. The groove 222 is formed so as to surround the periphery of the opening 221. As shown in Fig. 8 , the groove 222 has a bottom 222a and a pair of side walls 222b rising from the bottom 222a.

[0046] The cover portion 223 shown in Fig. 5 is capable of opening and closing the opening 221. The cover portion 223 is formed in a generally plate shape with the plate surface facing in the vertical direction. The cover portion 223 is formed in a shape corresponding to the groove portion 222 in a plan view. The cover portion 223 is formed so that the outer periphery is bent downward (see Fig. 8). The cover portion 223 includes a main body portion 223a and a side wall portion 223b.

[0047] The main body 223a is a portion that covers the opening 221 from above. The main body 223a is formed in a generally plate shape with the plate surface facing in the vertical direction.

[0048] The side wall portion 223b extends downward from the outer periphery of the main body portion 223a. As shown in FIG. 8, when the opening 221 is closed by the cover portion 223, the side wall portion 223b is inserted into the groove portion 222.

[0049] The blocking portion 224 shown in Figures 5 and 8 blocks the gap between the side wall portion 223b and the groove portion 222 when the opening 221 is closed by the cover portion 223. The blocking portion 224 is made of a flexible material such as rubber. The blocking portion 224 is formed in a ring shape that corresponds to the shape of the groove portion 222 in a plan view. The blocking portion 224 is disposed over the entire groove portion 222. The blocking portion 224 has a substantially uniform cross-sectional shape (the shape of the side cross section shown in Figure 8) over the entirety. The blocking portion 224 has an upper portion 224a and a lower portion 224d.

[0050] The upper portion 224a constitutes the upper part of the blocking portion 224. In a cross-sectional view, the upper portion 224a is formed in a substantially U-shape that opens upward. The tip of the side wall portion 223b is inserted into the opening of the upper portion 224a.

[0051] The upper portion 224a has a pair of wall portions 224b facing each other on the inner surface (the opening 221 side) and the outer surface (the side opposite the opening 221 side) of the side wall portion 223b inserted into the opening of the upper portion 224a. The wall portions 224b are each provided with a protrusion 224c that protrudes so as to abut against the side wall portion 223b. In the illustrated example, two protrusions 224c are formed on each wall portion 224b with a gap between them above and below. The protrusions 224c are formed around the entire circumference of each wall portion 224b.

[0052] The lower portion 224d constitutes a lower portion of the blocking portion 224. The lower portion 224d is formed in a substantially annular shape in a cross-sectional view. The outer diameter of the lower portion 224d in a cross-sectional view is formed to be larger than the groove width of the groove portion 222. Note that the outer diameter of the lower portion 224d may be formed to be equal to or smaller than the groove width of the groove portion 222.

[0053] As shown in Figure 8, when the blocking portion 224 is placed in the groove portion 222, the lower portion 224d deforms appropriately according to the shape of the groove portion 222. In this state, the lower portion 224d abuts against the bottom portion 222a and the side wall 222b of the groove portion 222, respectively. This blocks the gap between the lower portion 224d and the groove portion 222. Furthermore, when the opening portion 221 is closed by the cover portion 223, the side wall portion 223b of the cover portion 223 is inserted into the opening of the upper portion 224a of the blocking portion 224, and each protrusion 224c abuts against the side wall portion 223b. In this state, the gap between the opening of the upper portion 224a and the side wall portion 223b is blocked.

[0054] In this embodiment, the above-described blocking portion 224 blocks the gap between the side wall portion 223b of the cover portion 223 and the groove portion 222, thereby preventing water from entering through the gap. This prevents water from splashing on the GNSS receiving unit 30 inside the roof 200.

[0055] 8 , the cover portion 223 is fixed to the portion of the outer roof 220 surrounding the opening 221 by fastening the cover portion 223 using fasteners 225 while the opening 221 is closed. In this embodiment, the fasteners 225 are formed of bolts 225a and nuts 225b. The fasteners 225 can be made of a material (e.g., resin) that has little effect on the communication of the GNSS receiving unit 30. The cover portion 223 can be removed by releasing the fastening of the fasteners 225 (bolts 225a and nuts 225b). In this manner, the cover portion 223 is detachably provided on the upper surface of the outer roof 220.

[0056] Next, the support member 300 will be described. The support member 300 shown in Figures 2 to 4 is fixed to the cabin frame 110 in the internal space R and supports the GNSS receiving unit 30. In this embodiment, the support member 300 is fixed to the cabin frame 110 via the window frame 120. The support member 300 includes a frame fixing portion 310 and an apparatus fixing portion 320.

[0057] The frame fixing portion 310 is fixed to the window frame 120. The frame fixing portion 310 is provided on each of the left and right sides of the window frame 120. Since the left and right frame fixing portions 310 are configured symmetrically, the following description will focus on the frame fixing portion 310 provided on the left side, and description of the frame fixing portion 310 on the right side will be omitted where appropriate. The frame fixing portion 310 includes a main body portion 311 and a rear fixing portion 312.

[0058] The main body 311 shown in FIG. 4 is the main structure of the frame fixing part 310. The main body 311 has a plate portion 311a formed in a generally plate shape with its plate surface facing up and down. The plate portion 311a has a generally horizontally disposed plate surface. The main body 311 is provided with an extension portion 311b extending downward from the left end of the plate portion 311a. The main body 311 also has a fixing piece 311c extending leftward from the lower end of the extension portion 311b. The fixing piece 311c is fixed to the upper surface of the left second portion 122 of the window frame 120 (see FIG. 3). The fixing piece 311c is formed in a plate shape with its plate surface generally parallel to the upper surface of the second portion 122. In other words, the fixing piece 311c is formed so as to slope downward as it extends forward.

[0059] The rear fixing portion 312 is fixed to the first portion 121 of the window frame 120. The rear fixing portion 312 has a first fixing piece 312a that is fixed to the underside of the plate portion 311a of the main body portion 311. The rear fixing portion 312 is provided with an extension portion 312b that extends upward from the rear end of the first fixing piece 312a. The rear fixing portion 312 is also provided with a second fixing piece 312c that extends rearward from the upper end of the extension portion 312b. The second fixing piece 312c is fixed to the upper surface of the first portion 121 (see FIG. 3).

[0060] Two rear fixing portions 312 are provided for each main body portion 311. The rear fixing portions 312 are spaced apart in the left-right direction. The height position of the second fixing piece 312c of each rear fixing portion 312 is set according to the height (arch shape) of the upper surface of the first portion 121 to which the second fixing piece 312c is fixed. Specifically, of the rear fixing portions 312, the rear fixing portion 312 fixed to the center of the first portion 121 in the left-right direction is positioned higher than the rear fixing portion 312 fixed to the left side of the first portion 121. In addition, the vertical dimension of the extension portion 312b of each rear fixing portion 312 is set according to the height position of the second fixing piece 312c.

[0061] The above has described the left frame fixing part 310. The right frame fixing part 310 is formed bilaterally symmetrically to the left frame fixing part 310, and is attached to the right side of the window frame 120.

[0062] The device fixing portion 320 is detachably fixed to the left and right frame fixing portions 310, and the GNSS receiving portion 30 is fixed thereto. The device fixing portion 320 is formed in a substantially rectangular shape in a plan view. The device fixing portion 320 is formed in a shape that allows it to pass through the opening 221 of the outer roof 220. In this embodiment, the shape of the device fixing portion 320 in a plan view is formed to be smaller than the shape of the opening 221 in a plan view. The device fixing portion 320 includes a device fixing portion 321, an extension portion 322, and a frame side fixing portion 323.

[0063] The device fixing portion 321 is a portion to which the GNSS receiving unit 30 is fixed. The device fixing portion 321 is formed in a generally plate shape with the plate surface facing in the vertical direction. The plate surface of the device fixing portion 321 is also arranged generally horizontally. The GNSS receiving unit 30 is fixed to the upper surface of the device fixing portion 321 with appropriate fasteners.

[0064] The extensions 322 are portions that extend upward from both left and right end portions of the device fixing portion 321 .

[0065] The frame-side fixing portions 323 are portions that are detachably fixed to the left and right frame fixing portions 310. The frame-side fixing portions 323 extend outward in the left-right direction (anti-center side) from the upper ends of the left and right extending portions 322. The frame-side fixing portions 323 are formed in a plate shape with a plate surface that is generally parallel to the plate portion 311a of the frame fixing portion 310. Each frame-side fixing portion 323 is detachably fixed to the upper surface of the plate portion 311a of the left and right frame fixing portions 310 using fasteners such as bolts and nuts.

[0066] The configuration of the tractor 1 according to this embodiment has been described above. When the GNSS receiving unit 30 is attached to the window frame 120 (cabin frame 110) via the support member 300, the GNSS receiving unit 30 is housed in the internal space R of the roof 200 (see FIGS. 6 and 7 ). In this state, as shown in FIGS. 2 and 6 , the GNSS receiving unit 30 is disposed on the front side of the roof 200. Also, as shown in FIGS. 2 and 7 , the GNSS receiving unit 30 is disposed in the center of the roof 200 in the left-right direction. In this embodiment, the use of the support member 300 allows the GNSS receiving unit 30 to be attached using the window frame 120. Furthermore, in this embodiment, the support member 300 is formed in the shape described above, allowing the GNSS receiving unit 30 to be disposed approximately horizontally.

[0067] In the tractor 1 according to this embodiment, the GNSS receiving unit 30 can be attached and detached when performing maintenance or the like on the GNSS receiving unit 30. A method for attaching and detaching the GNSS receiving unit 30 will be described below.

[0068] First, a method for removing the GNSS receiving unit 30 housed in the internal space R will be described. When removing the GNSS receiving unit 30, the worker removes the fasteners used to secure the outer roof 220 and the cover portion 223, and removes the cover portion 223 from the upper surface of the outer roof 220 (see FIG. 5 ). In this state, the GNSS receiving unit 30 is exposed through the opening 221 of the outer roof 220.

[0069] Next, the worker removes the fasteners used to secure the frame fixing part 310 of the support member 300 to the device fixing part 320, and removes the device fixing part 320 from the frame fixing part 310 (see FIG. 4 ). In this state, the worker moves the device fixing part 320 with the GNSS receiving unit 30 attached thereto upward and passes it through the opening 221, thereby making it possible to remove the GNSS receiving unit 30 from the internal space R.

[0070] Next, a method for attaching the GNSS receiving unit 30 will be described. When attaching the GNSS receiving unit 30, the worker passes the device fixing part 320 with the GNSS receiving unit 30 attached through the opening 221 and moves it downward, in the opposite manner to the operation of removing the GNSS receiving unit 30. Next, the worker fixes the device fixing part 320 to the frame fixing part 310 using a fastener.

[0071] Next, the worker attaches the cover part 223 so as to close the opening 221 of the outer roof 220, and uses fasteners to secure the cover part 223 to the outer roof 220. This completes the installation work of the GNSS receiving unit 30. With the above configuration, the GNSS receiving unit 30 can be easily attached and detached while still being able to be housed inside the roof 200, thereby improving the maintainability of the GNSS receiving unit 30.

[0072] Furthermore, the tractor 1 may be shipped (sold) without the GNSS receiving unit 30. According to this embodiment, it is also possible to later attach the GNSS receiving unit 30 to the body of the tractor 1 that is not currently equipped with the GNSS receiving unit 30. A method for later attaching the GNSS receiving unit 30 will be described below. Note that the tractor 1 described below is assumed to have a support member 300 provided in the internal space R even if the tractor 1 is not equipped with the GNSS receiving unit 30.

[0073] When the GNSS receiving unit 30 is to be retrofitted, the worker removes the cover portion 223 from the outer roof 220 and removes the device fixing portion 320 from the frame fixing portion 310 of the support member 300 (see FIGS. 4 and 5 ). Next, the worker passes the device fixing portion 320 through the opening 221 and removes the device fixing portion 320 from the internal space R.

[0074] Next, the worker attaches the GNSS receiving unit 30 to the device fixing part 320, and also attaches the device fixing part 320 with the GNSS receiving unit 30 provided thereon to the frame fixing part 310. Next, the worker attaches the cover part 223 to the outer roof 220. This completes the work of retrofitting the GNSS receiving unit 30. With the above configuration, the GNSS receiving unit 30 can be housed inside the roof 200, and the work of retrofitting the GNSS receiving unit 30 can be easily performed. Note that at least a portion of the support member 300 (for example, the device fixing part 320) may be retrofitted together with the GNSS receiving unit 30.

[0075] As described above, the tractor 1 (work vehicle) according to this embodiment includes: a roof 200 that forms the ceiling of the cabin 100 and has an internal space R capable of accommodating equipment therein; and a GNSS receiving unit 30 that is capable of receiving GNSS signals and is disposed in the internal space R. This configuration allows the GNSS receiving unit 30 to be conveniently accommodated. By disposing the GNSS receiving unit 30 in the internal space R of the roof 200, unlike when the GNSS receiving unit 30 is disposed outside the cabin 100, the GNSS receiving unit 30 is prevented from obstructing the driver's view when looking forward and upward inside the cabin 100. This also improves the external appearance of the work vehicle. Furthermore, unlike when the GNSS receiving unit 30 is disposed on the top of the roof 200, there is no need to change the height position of the GNSS receiving unit 30 when storing the tractor 1, improving workability.

[0076] Moreover, the GNSS receiving unit 30 is disposed on the front side of the roof 200. With this configuration, the GNSS receiving unit 30 can be disposed in a position suitable for position detection. That is, in conventional tractors, the GNSS receiving unit 30 has generally been disposed on the front side of the cabin 100 (outside the cabin 100 and on the front side of the roof 200). According to the configuration of this embodiment, the GNSS receiving unit 30 within the roof 200 is disposed on the front side of the roof 200, so that position detection can be performed at a position close to the position where the conventional GNSS receiving unit 30 is disposed (a position where the fore-and-aft position is not significantly changed).

[0077] The roof 200 is also formed with an opening 221 that opens to communicate with the internal space R, and is provided with a cover 223 that can open and close the opening 221. With this configuration, it becomes possible to perform maintenance on the GNSS receiving unit 30 through the opening 221, thereby improving the maintainability of the GNSS receiving unit 30.

[0078] Furthermore, the opening 221 is formed in a shape that allows the GNSS receiving unit 30 to pass through on the upper surface of the roof 200. By configuring it in this way, maintenance of the GNSS receiving unit 30 can be easily performed from the upper surface side of the roof 200. Furthermore, the GNSS receiving unit 30 can be attached and detached by passing through the opening 221.

[0079] The cabin 100 also includes a cabin frame 110 that supports the roof 200, and a support member 300 that is fixed to the cabin frame 110 and supports the GNSS receiving unit 30 in the internal space R. With this configuration, the GNSS receiving unit 30 can be favorably supported in the internal space R of the roof 200.

[0080] The support member 300 also includes a frame fixing portion 310 that is fixed to the cabin frame 110, and an apparatus fixing portion 320 that is detachably fixed to the frame fixing portion 310, has the GNSS receiving unit 30 fixed thereto, and is formed in a shape that allows it to pass through the opening 221. This configuration improves the ease of attaching and detaching the support member 300. Furthermore, the apparatus fixing portion 320, with the GNSS receiving unit 30 fixed thereto, can be passed through the opening 221 to attach or detach the GNSS receiving unit 30.

[0081] The cabin 100 is also provided with a window frame 120 (window frame portion) that is fixed to the cabin frame 110 and can support a window portion when the window portion is provided in the roof 200, and the support member 300 is fixed to the cabin frame 110 via the window frame 120. With this configuration, the GNSS receiving unit 30 can be attached using the window frame 120.

[0082] The cover portion 223 includes a main body portion 223a that covers the opening 221 from above, and a side wall portion 223b that extends downward from the outer periphery of the main body portion 223a. A groove portion 222 that opens upward and into which the side wall portion 223b is inserted is formed around the opening 221 in the roof 200. The groove portion 222 is provided with a blocking portion 224 that blocks the gap between the side wall portion 223b and the groove portion 222. This configuration can prevent water from entering through the gap between the cover portion 223 and the opening 221. This can prevent water from splashing on the GNSS receiving unit 30 inside the roof 200.

[0083] The tractor 1 according to this embodiment is one embodiment of a work vehicle according to the present invention. The window frame 120 according to this embodiment is one embodiment of a window frame portion according to the present invention.

[0084] Although one embodiment of the present invention has been described above, the present invention is not limited to the above configuration, and various modifications are possible within the scope of the invention described in the claims.

[0085] For example, in the present embodiment, an example has been shown in which the support member 300 is fixed to the cabin frame 110 using the window frame 120, but the present invention is not limited to this. For example, it is also possible to fix the support member 300 to the cabin frame 110 directly or via another member without using the window frame 120.

[0086] Furthermore, in the present embodiment, an example has been shown in which the GNSS receiving unit 30 is disposed on the front side of the roof 200 (a position where a window can be installed), but the present invention is not limited to this. For example, if it is difficult to install the GNSS receiving unit 30 on the front side of the roof 200, such as when a window is installed on the roof 200, the GNSS receiving unit 30 may be disposed in a position other than the front side (for example, on the rear side or in the center in the longitudinal direction). Furthermore, in the present embodiment, an example has been shown in which the GNSS receiving unit 30 is disposed in the center in the lateral direction of the roof 200, but the present invention is not limited to this. For example, the GNSS receiving unit 30 can also be disposed on the right or left side of the roof 200. As described above, the GNSS receiving unit 30 can be disposed in various positions within the roof 200.

[0087] Furthermore, in this embodiment, an example has been shown in which the opening 221 is provided on the upper surface of the roof 200 (outer roof 220), but the present invention is not limited to this. For example, the opening may be provided on the lower surface of the roof 200 (inner roof 210). In this case, maintenance of the GNSS receiving unit 30 can be performed from inside the cabin 100. In this case, the blocking portion 224 may not be provided.

[0088] Furthermore, in the present embodiment, an example has been shown in which the cover portion 223 constitutes part of the roof 200 (outer roof 220), but the present invention is not limited to this. For example, the cover portion 223 may be formed as a separate member from the roof 200. In this case, for example, a configuration can be adopted in which the cover portion 223 is formed integrally with the GNSS receiving unit 30, and the cover portion 223 closes the opening 221 when the GNSS receiving unit 30 is attached to the roof 200.

[0089] In addition, in this embodiment, an example has been shown in which the cabin 100 is configured to include the front pillars 111, the rear pillars 112, and the center pillar 113 (six-pillar type), but the present invention is not limited to this. The cabin 100 can have various configurations, such as a configuration without the center pillar 113 (four-pillar type).

[0090] In addition, in the present embodiment, an example has been shown in which the control device is disposed in a position other than the interior space R (outside the roof 200), but the present invention is not limited to this. For example, the control device may be disposed in the interior space R together with the GNSS receiving unit 30.

[0091] Furthermore, the shapes, structures, etc. of each part exemplified in this embodiment are merely examples, and the configuration of each part can be changed as desired.

[0092] In the above embodiment, the tractor 1 is used as an example of the work vehicle, but the work vehicle is not limited to this. For example, the work vehicle may be an agricultural vehicle, a construction vehicle, an industrial vehicle, or the like.

[0093] The present invention can be applied to a work vehicle.

[0094] 1 Tractor 30 GNSS receiver 100 Cabin 200 Roof 300 Support member

Claims

1. A work vehicle comprising: a roof that forms the ceiling of a cabin and has an internal space capable of accommodating equipment therein; and a GNSS receiving unit that is capable of receiving GNSS signals and is disposed in the internal space.

2. A work vehicle as described in claim 1, wherein the GNSS receiving unit is disposed on the front side of the roof.

3. A work vehicle as described in claim 1, wherein the roof is formed with an opening that opens to communicate with the internal space, and the work vehicle is provided with a cover portion that can open and close the opening.

4. A work vehicle as described in claim 3, wherein the opening is formed in the upper surface of the roof in a shape that allows the GNSS receiving unit to pass through.

5. A work vehicle as described in claim 3, wherein the cabin comprises: a cabin frame supporting the roof; and a support member in the internal space, fixed to the cabin frame and supporting the GNSS receiving unit.

6. A work vehicle as described in claim 5, wherein the support member comprises: a frame fixing portion fixed to the cabin frame; and an equipment fixing portion that is detachably fixed to the frame fixing portion, to which the GNSS receiving unit is fixed, and which is formed into a shape that allows it to pass through the opening.

7. A work vehicle as described in claim 5, wherein the cabin is fixed to the cabin frame and is provided with a window frame portion capable of supporting a window portion when the window portion is provided in the roof, and the support member is fixed to the cabin frame via the window frame portion.

8. A work vehicle as described in claim 4, wherein the cover portion comprises a main body portion covering the opening from above, and a side wall portion extending downward from the outer periphery of the main body portion, and a groove portion is formed in the roof around the opening, the groove portion opening upward and into which the side wall portion is inserted, and the groove portion is provided with a blocking portion that blocks a gap between the side wall portion and the groove portion.

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