Work vehicles

Abstract

We provide a work vehicle that can reliably extract capacitors. [Solution] A work vehicle comprising an engine (E), a bonnet (6) housing the engine (E), a capacitor (50) erected in the internal space covered by the bonnet (6), a capacitor frame (52) for mounting the capacitor (50), the capacitor (50) being supported so as to be able to be pulled out from the capacitor frame (52), and a posture support member (53) that engages the pulled-out capacitor (50) with the capacitor frame (52) to stabilize its posture.

Description

Technical Field

[0001] The present invention relates to a work vehicle such as an agricultural tractor.

Background Art

[0002] There is a tractor with a capacitor attached rotatably. (For example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, space for rotation is required during maintenance, and members cannot be arranged around the capacitor. By configuring the capacitor to be pullable, space can be saved and maintenance can be performed. However, since a hose through which air conditioner gas flows is connected to the capacitor, it is necessary to stabilize the posture of the pulled-out capacitor so that the hose does not come off.

[0005] In view of the above problems, an object of the present invention is to provide a work vehicle capable of stably pulling out a capacitor.

Means for Solving the Problems

[0006] Therefore, the work vehicle according to the invention is characterized by comprising an engine (E), a bonnet (6) housing the engine (E), a capacitor (50) erected in the internal space covered by the bonnet (6), a capacitor frame (52) for mounting the capacitor (50), the capacitor (50) being supported so as to be able to be pulled out from the capacitor frame (52), and a posture support member (53) that engages the pulled-out capacitor (50) with the capacitor frame (52) to stabilize its posture. [Effects of the Invention]

[0007] According to the present invention, when the capacitor (50) is pulled out, the posture support member (53) can be hooked onto the capacitor frame (52), thereby stabilizing the posture of the capacitor. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side view of a tractor according to an embodiment of the present invention. [Figure 2] This is a plan view showing the main parts of the cabin. [Figure 3] Perspective view of the inside of the hood, seen from the front. [Figure 4] Perspective view of the inside of the hood from the side. [Figure 5] Diagram showing the attachment and detachment of the radiator net and condenser net. [Figure 6] This is a perspective view of a capacitor. [Figure 7] This is a perspective view of a roller blind. [Figure 8] This is an end view illustrating the operation of the rail and roller screen. [Figure 9] This is a plan view of a cabin illustrating another embodiment of the present invention. [Figure 10] This is an end view illustrating the operation of the wire storage section. [Figure 11] This is a block diagram of a management system according to an embodiment of the present invention. [Modes for carrying out the invention]

[0009] As one embodiment of the present invention, an agricultural tractor 1 equipped with a rotary tiller W, which is a type of work vehicle, will be described.

[0010] As shown in Figure 1, Tractor 1 is an agricultural tractor that performs work in fields and other areas while moving under its own power.

[0011] In the following, the forward and backward directions refer to the direction of travel when the tractor 1 is moving straight, with the front side of the direction of travel defined as "forward" and the rear side as "rear." The direction of travel of the tractor 1 is the direction from the driver's seat 8 (described later) toward the steering wheel 9, which serves as the steering device, when moving straight.

[0012] The left-right direction is the direction perpendicular to the front-back direction. In the following, left and right are defined with respect to the "front" side. That is, with the operator of tractor 1 (also called the "driver") seated in the driver's seat 8 and facing forward, the left side is "left" and the right side is "right".

[0013] The vertical direction refers to the vertical direction. The front-back, left-right, and up-down directions are orthogonal to each other. Note that these directions are defined for the sake of explanation, and the present invention is not limited by these directions. Also, in the following, tractor 1 may be referred to as the machine body or vehicle body.

[0014] As shown in Figure 1, the tractor 1 comprises a vehicle body 2 and a linkage mechanism L for implements at its rear. The vehicle body 2 comprises a vehicle frame 3 which serves as the main frame, left and right drive front wheels 4 steered by a steering wheel 9, left and right drive rear wheels 5, a bonnet 6, an engine E, a control unit 7a inside the cabin 7, and a transmission case 10.

[0015] The bonnet 6 is provided at the front part of the traveling vehicle body 2 so as to be openable and closable. The front part of the bonnet 6 can rotate (open and close) in the vertical direction with the rear part as the rotation center. The bonnet 6 covers the engine E mounted on the vehicle body frame 3 in the closed state.

[0016] The engine E is a drive source of the tractor 1 and is a heat engine such as a diesel engine or a gasoline engine.

[0017] Next, the inside of the bonnet 6 will be described with reference to FIGS. 3 to 6.

[0018] Inside the bonnet 6, there are an engine E, a DPF 61 for removing all of the harmful gases discharged from the engine E, an air cleaner 62 for removing foreign matters when taking in the air supplied to the engine E, an intercooler 63 for cooling the air supplied to the engine E after passing through the air cleaner 62, a radiator 64, a reserve tank 65, a battery 66, a compressor 67 for compressing the refrigerant sent from the air conditioner unit 80, a condenser 50 for liquefying the refrigerant compressed by the compressor 一 67, a receiver dryer 68 for storing the refrigerant sent from the condenser 50 or removing moisture from the refrigerant, etc.

[0019] The layout inside the bonnet 6 will be described.

[0020] <000,0105> A base plate 60 is provided on the front side of the vehicle body. A battery 66 and a reserve tank 65 are arranged side by side at the front part of the base plate 60. A receiver dryer 68 and a condenser 50 are arranged side by side behind the battery 66 and the reserve tank 65. The receiver dryer 68 and the condenser 50 are connected. An intercooler 63 is provided behind the receiver dryer 68 and the condenser 50, and a radiator 64 is provided behind the intercooler 63. An air cleaner 62 is provided above the condenser 50 and the battery 66.

[0021] The battery 66, condenser 50, intercooler 63, radiator 64, and air cleaner 62 are mounted in a position where their longest sides are aligned with the left-right direction of the vehicle body.

[0022] A radiator net 69 is provided between the radiator 64 and the intercooler 63, and a condenser net 70 is provided between the condenser 50 and the battery 66. The front of the radiator 64 is supported by a radiator front bracket 71, and the rear of the radiator 64 is supported by a radiator rear bracket 72. A piping bracket 73 for supporting piping, which will be described later, is provided on the upper part of the radiator rear bracket 72, and a through hole is formed in the piping bracket 73 for the piping to pass through. The radiator fan 74 is located in a radiator fan guide 75 at the rear of the radiator 64. The radiator front bracket 71 is bent at both the left and right ends toward the front, and is configured to cover both the left and right sides of the intercooler 63.

[0023] An engine E is located behind the radiator 64, a DPF 61 is located above the rear of the engine E, and a compressor 67 is located above the front of the engine E.

[0024] Next, we will explain how to attach and detach the radiator net 69 and condenser net 70 during maintenance.

[0025] A radiator net stay 76 is attached to one side of the radiator net 69, and a condenser net stay 77 is provided on one side of the condenser net 70.

[0026] The radiator net stay 76 is bent forward from the mounting portion, and the bent portion passes to the side of the radiator front bracket 71. A fastener (strike) 78 is attached to the front end of the bent portion. The condenser net stay 77 is bent backward from the middle of the mounting portion, and a through hole for the fastener 78 is provided at the rear end. A receiving device (latch) 79 for the fastener 78 is provided on the condenser 50 side, and the radiator net stay 76 and the condenser net stay 77 are fastened together by inserting the fastener 78 into the receiving device 79 through the through hole, thereby fixing the position of the radiator net 69 and the condenser net 70.

[0027] When pulling out the radiator net 69 and condenser net 70 during maintenance, the fixing device 78 is pulled out from the receiving device 79, which first allows the radiator net 69 to be pulled out to the left and right sides. Then, the condenser net 70 can also be pulled out to the left and right sides. When inserting, the condenser net 70 is inserted first, followed by the radiator net 69, and the fixing device 78 is secured to the receiving device 79.

[0028] According to this embodiment, the radiator net 69 and the condenser net 70 can be attached and detached without tools. Furthermore, they can be attached and detached using a common fastener 78 and receiver 79. This also prevents incorrect insertion. Note that the fastener 78 may also be attached to the condenser net stay 76 side.

[0029] Next, we will explain how to attach and detach the capacitor 50 and the receiver dryer 68.

[0030] A condenser stay 80 is attached to one side of the condenser 50, and the condenser stay 80 is connected to the side of the bend on one side of the radiator front bracket 71 with a bolt 81. The other side of the condenser 50 is connected to the other side of the radiator front bracket 71 with a bolt 82. When bolts 81 and 82 are removed, the condenser 50 can be slid to one side and pulled out together with the receiver dryer 68.

[0031] Inside the hood 6, the air conditioner condenser 50 is mounted on the base plate 60 so as to be retractable from a pipe-shaped condenser frame 52. The condenser 50 consists of a main body 501 and a condenser bracket 502 that supports the condenser 50, and is erected in front of the radiator 64. A hose 72 through which air conditioning gas flows is connected to the condenser 50, and left and right condenser brackets 502L and R are provided at both ends of the condenser 50. A posture support member 53, which consists of a condenser bracket mounting portion 531 and an L-shaped or U-shaped hook portion 532, is assembled to the left condenser bracket 502L using a wing bolt 54.

[0032] The posture support member 53 is provided with a notch 533, and by passing the notch 533 through a pin 55 provided on the left capacitor bracket 502L, the posture support member 53 can be rotated freely within the range of the notch 533, and the posture support member 53 can be rotated freely to change between an engaged position in which it functions as a hook to catch on the capacitor frame 52 and an unengaged position in which it does not catch on the capacitor frame 52, depending on the work to be done.

[0033] Specifically, when pulling out the capacitor 50, the capacitor 50 can be pulled out from the capacitor frame 52 by pressing the hook portion 532 of the posture support member 53, which is in an unengaged position.

[0034] After pulling out the hose, the posture support member 53 is rotated to the engaged position and fixed to the condenser 50 using the wing bolt 54. This allows the hook portion 532 to be hooked onto the other side of the condenser frame 52, making it easy to fix the posture of the condenser 50. Fixing the posture of the condenser 50 stabilizes its position, allowing maintenance of the condenser 50 to be performed without removing the hose.

[0035] Furthermore, by disengaging the capacitor 50 when it is installed, the hook portion 532 can be held and the capacitor 50 can be pulled from the other side, making installation easier.

[0036] In other words, the condenser 50 was connected to a hose 72 through which air conditioning gas flowed, and it was not possible to remove the condenser 50 from the hood 6 without bleeding the gas. However, bleeding the gas required the use of special tools, so it was necessary to stabilize the position of the condenser 50 so that it could be pulled out from inside the hood 6 without disconnecting the hose 72.

[0037] Therefore, by providing a posture support member 53, and by providing the posture support member 53 so that the capacitor 50 can be hooked onto the capacitor frame 52 after being removed, the posture of the capacitor 50 can be easily maintained while the entire surface of the capacitor 50 is pulled out and the posture of the capacitor 50 is maintained by the posture support member 53.

[0038] The control unit 7a is located inside a cabin 7 situated on top of the vehicle body 2 and includes a cockpit 8, a steering wheel 9, and the like.

[0039] The cockpit 8 is the seat for the operator (driver). The steering wheel 9 is operated by the operator to steer the left and right front wheels 4.

[0040] The transmission case 10 houses the transmission (speed change mechanism). The transmission case 10 reduces the power (rotational power) transmitted from the engine E as needed by the transmission and transmits it to the drive wheels, which are the left and right drive front wheels 4 and left and right drive rear wheels 5, and the PTO shaft 45.

[0041] At the rear of the vehicle body 2, a hydraulic cylinder case 40 is provided on the upper rear of the transmission case 10. Lift arms 41, which constitute part of the hydraulic lifting mechanism, are rotatably mounted on both the left and right sides of this cylinder case 40. The lift arms 41 move up and down by the extension and retraction of the lifting hydraulic cylinder 40a.

[0042] Furthermore, a three-point linkage mechanism L consisting of a top link T42 and left and right lower links 43 is provided, and a rotary tiller W is attached to this linkage mechanism L. The lower links 43 are connected to the lift arm 41 via a lift rod 44, thereby enabling the rotary tiller W to be raised and lowered. A PTO shaft 45 that transmits power to drive the rotary tiller W protrudes rearward from the transmission case 10.

[0043] The PTO shaft 45 transmits rotational power, which has been appropriately reduced by the transmission, to the rotary tilling implement W mounted on the rear of the vehicle body 2 via a drive shaft 46 equipped with universal joints at both ends.

[0044] The rotary tiller W is a machine that performs tilling work in a field. The rotary tiller W tills the field surface (soil) by rotating the tilling tines 47 with power transmitted from the PTO shaft 45.

[0045] The front control panel FP at the front of the control unit 7a is equipped with a monitor, which is a notification device that displays various information in front of the steering wheel 9.

[0046] Furthermore, the front control panel FP section is equipped with various control pedals such as the accelerator pedal 11, left and right brake pedals 12L and 12R for braking the left and right rear wheels 5 respectively, and a clutch pedal, as well as various control levers such as the forward / reverse lever, accelerator lever, main transmission lever, sub-transmission lever, and turn signal lever for operating the turn signals.

[0047] Furthermore, a control device 13 is provided in the front control panel FP section, and a GNSS 15, which serves as a positioning device, is mounted on the front upper surface of the roof 14 of the cabin 7.

[0048] The control device 13 controls various parts such as the engine E, the drive system and operating system of the vehicle body 2, and the rotary tilling implement W. It is equipped with a recording unit that records various data such as a calendar database that stores the position of the sun and a map database. The recording unit calculates the work route for the autonomous tractor 1 to perform round-trip operations on the user-owned field F registered in the map database and stores the work route in the map database.

[0049] Tractor 1 receives signals from positioning satellites via GNSS15 in field F, calculates its position using the satellite positioning system, and autonomously drives (automatically operates) along the work route, performing tasks automatically.

[0050] As shown in Figures 1 and 2, the cabin 7 is fixed to the vehicle body via elastic members such as vibration-damping rubber, making it difficult for vibrations from the vehicle body to be transmitted to the cabin 7.

[0051] Cabin 7 has a frame structure that is integrated by a floor 17, front support columns 18 erected on the left and right front of the floor 17, rear support columns 19 erected on the left and right rear of the cockpit 8, intermediate support columns 20 erected in the middle of the front and rear, and an upper frame 21 connecting the upper ends of these support columns, and the upper part is covered by a roof 14 fixed to the upper frame 21.

[0052] Furthermore, the front and rear sides are equipped with a windshield FG and a rear window RG, while the left and right sides are equipped with opening and closing doors 22 and side windows SG.

[0053] The opening and closing door 22 is a glass door with transparency, and has an upper and lower edge. The front side follows the front support column 18, the lower rear side follows the fender 25, and the upper rear side follows the intermediate support column 20. A sealing material is fitted around the perimeter of the tempered glass. Hinges 27 are configured at two locations, upper and lower, between the rear of the opening and closing door 22 and the intermediate support column 20. The hinges 27 are fixed from the outside of the intermediate support column 20 and the opening and closing door 22, allowing the opening and closing door 22 to rotate outward and open the left and right sides of the cabin 7.

[0054] An outer door handle 28 is provided on the lower front outer side of the opening / closing door 22. An inner door handle is also provided on the inner side of the opposing opening / closing door 22.

[0055] An electronic compass 29 is provided on a reinforcing plate 18a connected to the left and right front support pillars 18, which are reinforcing members of the windshield FG, as a means for detecting the direction of the tractor 1.

[0056] Furthermore, a U-shaped rail 31, fixed to the upper frame 21, is installed in the upper part of the cabin 7, and a roll screen 30 is movably mounted on it.

[0057] As shown in Figure 7, the roll screen 30 is a typical type in which a flat light-shielding member that blocks sunlight and the like is rolled up and stored inside the main body 30a. When the lower handle 31 is pulled downwards, the light-shielding member rolled up inside the main body 30a is pulled out to the position where the handle was pulled, and when the storage knob 32 on the side is pulled, the pulled-out light-shielding member is rolled up and stored inside the main body 30a.

[0058] On the upper surface of the main body 30a of the roller screen 30, rail mounting stays 33 are provided on the left and right sides, respectively.

[0059] As shown in Figure 8, the rail mounting stay 33 has an electric motor 33b fixed to the upper part of a mounting seat 33a, the base of which is fixed to the upper surface of the main body 30a, and drive wheels (tires) 33d, 33d, which serve as a moving device, are attached to the drive shafts 33c, 33c that protrude from both sides of the electric motor 33b.

[0060] The electric motor 33b operates in forward and reverse directions according to the command of the control device 13, thereby rotating the drive wheels 33d, 33d in forward and reverse directions.

[0061] The rail 31, installed in the upper part of the cabin 7, is made of a curved square pipe material and arranged in a U-shape in plan view along the top of the front windshield FG and the opening doors 22 on both sides and the side windows SG at the front of the cabin 7. A movable through hole 31a for the mounting base 33a of the rail mounting stay 33 for the roll screen 30 is provided along the entire length of the rail on the underside.

[0062] The roller screen 30 is attached to the rail 31 by inserting two rail mounting stays 33 from one end of the rail 31, with the mounting base 33a inserted through the through hole 31a on the underside of the rail 31 and both drive wheels 33d, 33d in contact with the bottom surface 31b inside the rail 31.

[0063] Here, we will explain the control mechanism by which the roller screen 30 moves along the rail 31 to block sunlight from the operator (driver) seated in the cockpit 8.

[0064] When starting work in field F, the worker pulls the handle 31 of the roll screen 30 downwards to pull the light-shielding member to the designated position.

[0065] Then, start engine E and turn on the main switch to activate the control device 13.

[0066] The control device 13 receives signals from positioning satellites using GNSS 15 and calculates the position information and current time of the tractor 1 using the satellite positioning system. The electronic compass 29 detects the orientation of the tractor 1, calculates the position of the sun at the current time from the calendar database in the recording unit, calculates the relative position of the sun to the tractor 1, and operates the electric motor 33b to rotate the drive wheels 33d, 33d until the roll screen 30 is in a position to block sunlight from the worker (driver) seated in the driver's seat 8, moving the roll screen 30 along the rail 31 and stopping.

[0067] Therefore, the roller screen 30 can effectively block sunlight, allowing workers to perform their tasks effectively.

[0068] Furthermore, since the rail 31 is arranged in a U-shape in a plan view along the windshield FG at the front of the cabin 7, the opening and closing doors 22 on both the left and right sides, and the top of the side windows SG, the roll screen 30 can be moved forward and to the left and right of the cabin 7 to properly block sunlight.

[0069] Figure 9 shows another embodiment in which light sensors 37 are provided at the front and on both sides of the cabin 7, and the roll screen 30 is moved according to the ratio of light intensity detected by the three light sensors 37 to appropriately block sunlight from the worker (driver) seated in the cockpit 8.

[0070] Specifically, the three light sensors 37 are located at the left-right center position above the windshield FG on the front side of the roof 14 of the cabin 7, at the top of the side glass SG on the right side of the roof 14, and at the top of the opening / closing door 22 on the left side of the roof 14.

[0071] The control device 13 calculates the ratio of light intensity detected by the three light sensors 37, determines the direction with the most light intensity relative to the cabin 7, and operates the electric motor 33b to rotate the drive wheels 33d, 33d until the roll screen 30 is in a position where it blocks sunlight from the worker (driver) seated in the cockpit 8, moving the roll screen 30 along the rail 31 and stopping.

[0072] The wire 301 is configured to extend and retract when the roller screen 30 is moved. As shown in Figures 8 and 10, a wire storage section 303 is provided on one side of the roller screen 30, which has a wire winding motor 302 and allows the wire 301 to be extended or retracted.

[0073] The position detection unit 310 has the function of determining the current position of the roll screen 30 from the length of the wire 301 obtained by the wire length acquisition unit 311. The wire length acquisition unit 311 detects the length of the pulled-out wire 301 by monitoring the rotation speed of the wire winding motor 302 when the wire 301 is extended or retracted.

[0074] Then, as shown in Figure 11, the control device 13 obtains detection information from the position detection unit 310 using the winding mechanism, and the discrimination unit 131 determines whether or not the current position of the roll screen 30 is at the target position.

[0075] When the discrimination unit 131 receives detection information from the position detection unit 310 indicating a discrepancy between the current position and the target position, the discrimination unit 131 determines that it is necessary to move the roll screen 30 again to correct the current position, and activates the electric motor 33b to rotate the drive wheels 33d, 33d to move the roll screen along the rail 31 and stop.

[0076] At this time, if the difference between the current position and the target position is less than or equal to a predetermined value, it is determined that the target position has been reached, and the roller screen 30 is not moved.

[0077] Furthermore, control by the control device 13 continues until the position detection unit 310 stops detecting that the current position of the roll screen 30 is not at the target position, and terminates after the target position is reached.

[0078] Therefore, the roller screen 30 can effectively block sunlight, allowing workers to perform their tasks effectively. A mode switching switch 100 is provided, and the automatic mode and manual mode can be switched using the mode switching switch 100. In automatic mode, the roller screen 30 is automatically moved to a position that blocks sunlight, and in manual mode, it can be moved by the operator (driver). The mode switching switch 100 is operated by the operator.

[0079] Regarding the current position, the minimum and maximum wire lengths are predetermined. When the length of the wire 301 pulled out from the wire storage unit 303 is the minimum length, the output is restricted to move to a shorter length. When it is the maximum length, the output is restricted to move to a longer length. By restricting further movement, the load on the wire winding motor 302 is reduced, making it less prone to failure. [Explanation of Symbols]

[0080] 6. Hood 50 Capacitors 501 Main Unit 502 Capacitor Bracket 52 Capacitor Frame 53 Posture support member 531 Capacitor bracket mounting section 532 Hook part

Claims

1. The engine and The hood housing the aforementioned engine, A condenser is erected in the internal space covered by the aforementioned hood, The capacitor frame for mounting the aforementioned capacitor is provided, The capacitor is supported so that it can be freely extended from the capacitor frame. A work vehicle characterized by comprising a posture support member that engages the extended capacitor with the capacitor frame to stabilize its posture.

2. The attitude support member has an engaging position that functions as a hook that attaches to the capacitor frame, The work vehicle according to claim 1, characterized in that it is configured to be changeable to a non-engaging position that does not get caught on the capacitor frame.

3. The attitude support member is provided on one side of the left or right side of the capacitor. The work vehicle according to claim 2, characterized in that the front capacitor is pulled out and engages with the other side of the capacitor frame.

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