Work vehicle

Abstract

To provide a working vehicle capable of inexpensively constituting a belt attaching-detaching part capable of replacing a belt without disassembling a fan shroud with a rigid body structure, and capable of reducing even a maintenance work cost.SOLUTION: The fan shroud 58 is integrally provided with a peripheral 58b formed wide on the outer periphery of a box-shaped main body 58a formed with a ventilation hole 58c so as to form a series of cylindrical bodies, and one of the peripheral 58c is provided with a belt attachment / detachment portion 60 including a fan belt 41, a maintenance hole 61 formed as a long hole into which fingers can be inserted, and a hole lid 62 capable of opening and closing the maintenance hole 61.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a belt maintenance structure for a cooling fan configured in a work vehicle such as a combine harvester or a tractor. [Background technology]

[0002] Conventionally, combine harvesters, which are agricultural work vehicles, are equipped with a water-cooled diesel engine, a radiator that cools the engine's cooling water, a cooling fan that is driven from the engine via a fan belt and supplies cooling air to the radiator, and a fan shroud that surrounds the outer periphery of the cooling fan, with these driving parts arranged in an engine room covered by an engine cover. The box-shaped fan shroud, which is hollow inside and covers the entire radiator core, has its four corners attached to the back side of the radiator with bolts, and a circular opening is provided in the center near the top of the body. Approximately half of the tip of the cooling fan passes through this opening, and the body surrounds the outer periphery of the cooling fan. In this configuration, the fan shroud has an opening formed by partially cutting out the main body from top to bottom on the right side facing the outer periphery of the cooling fan, and this opening has a split cover structure that can be detachably covered with a plate cover made of an L-shaped bent plate that roughly matches the shape of the main body before cutting out (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6348376 Summary of the Invention [Problem to be solved by the invention]

[0004] In the combine harvester shown in Patent Document 1, when the fan belt that drives the cooling fan becomes worn and needs to be replaced, or when the fan belt needs to be replaced due to regulations regarding engine operating hours, the operator can first remove multiple bolts from the main body of the fan shroud, remove the plate cover to the outside of the machine, and with the side of the cooling fan open, remove the loosened fan belt from each pulley, pass the removed fan belt over the outer circumference of the cooling fan, and then pull it out through the gap between the radiator and the cooling fan from the wide opening on the side, allowing it to be smoothly retrieved.This has the advantage that a new fan belt can also be easily installed by following the reverse procedure. On the other hand, fan shrouds with a split cover structure in which the cover body with a portion cut out on the side and the plate cover are detachable require the laborious task of attaching and detaching multiple bolts located in multiple locations, and the plate cover must be handled carefully in a small space, making installation a complicated and time-consuming process.In addition, there are problems with parts being easily lost or forgotten to be assembled. Furthermore, a fan shroud with a split cover structure requires the labor and assembly steps of manufacturing the main cover portion and the side cover portions in separate processes, which increases costs. Furthermore, the main body cover, which is press-formed from a thin steel plate, has a C-shape with a circular opening cut out when viewed from the front. This means that the opening material formed on the upper side has a long, thin arm shape, which can easily become deformed or damaged during handling during the parts processing and assembly processes. [Means for solving the problem]

[0005] In order to solve the above problems, firstly, the present invention provides a work vehicle 1 including a water-cooled engine 17, a radiator 57 that cools the coolant for the engine 17, a cooling fan 26 that is driven from the engine 17 via a ring-shaped fan belt 41 and supplies cooling air to the radiator 57, and a square box-shaped fan shroud 58 that has ventilation holes 58b for the cooling fan 26 and surrounds the outer periphery via a peripheral wall 58c for guiding air, forming a shroud chamber that is open on the radiator 57 side, The fan shroud 58 is characterized in that a wide peripheral wall 58c is formed on the outer periphery of a box-shaped main body 58a in which ventilation holes 58b are formed, and the wide peripheral wall 58c is integrally formed to form a continuous cylindrical body, and one side wall of the peripheral wall 58c is provided with a belt detachment section 60 consisting of a maintenance hole 61 formed as an elongated hole through which the fan belt 41 and a finger can be inserted, and a hole cover 62 which allows the maintenance hole 61 to be opened and closed. Secondly, a belt guide portion 65 that allows and guides the passage of the fan belt 41 inserted into the ventilation hole 58b of the fan shroud 58 is recessed and formed on the inner circumferential side of the ventilation hole 58b near the maintenance hole 61. [Effects of the Invention]

[0006] According to the invention of claim 1, a work vehicle 1 is provided with a water-cooled engine 17, a radiator 57 that cools the coolant for the engine 17, a cooling fan 26 that is driven from the engine 17 via a ring-shaped fan belt 41 and supplies cooling air to the radiator 57, and a square box-shaped fan shroud 58 that has ventilation holes 58b for the cooling fan 26 and surrounds the outer periphery via a peripheral wall 58c for guiding air, forming a shroud chamber that is open on the radiator 57 side, the fan shroud 58 is provided with a box-shaped main body 58a that has the ventilation holes 58b formed therein and a peripheral wall 58c that is formed wide around the outer periphery of the main body 58a so as to form a continuous cylinder, and a belt detachment section 60 is provided on one side wall of the peripheral wall 58c, the belt detachment section 60 comprising a maintenance hole 61 formed as an elongated hole through which the fan belt 41 and a finger can be inserted, and a hole cover 62 that can open and close the maintenance hole 61, The fan belt 41 removed from the engine 17 and inserted into the shroud chamber through the ventilation hole 58b can be smoothly pulled out of the shroud chamber by fingers inserted through the maintenance hole 61 with the hole cover 62 opened, and a new fan belt 41 can be inserted through the maintenance hole 61, taken out through the ventilation hole 58b via the shroud chamber and attached, so that a series of maintenance operations for the fan belt 41 can be performed simply and efficiently. Furthermore, the fan shroud 58 has a belt detachment section 60 that allows maintenance work such as belt replacement to be performed without disassembling the fan shroud 58, and can be produced inexpensively with an integrated rigid structure without increasing the number of parts, while also reducing maintenance work costs. According to the invention of claim 2, the belt guide portion 65, which allows and guides the passage of the fan belt 41 inserted into the ventilation hole 58b of the fan shroud 58, is recessed and formed on the inner circumferential side of the ventilation hole 58b near the maintenance hole 61, When removing the fan belt 41 and removing it outside the aircraft, if the fan belt 41 is accidentally bent, it can be placed inside the ventilation hole 58b and passed over the cooling fan 26 before being moved into the shroud chamber. The belt passing portion 65 recessed into the ventilation hole 58b on the side closest to the maintenance hole 61 makes it easier to pass the fan belt 41 through the desired location and also makes it easier for the fan belt 41 to pass through the gap formed between the ventilation hole 58b and the cooling fan 26, so that the introduction of the fan belt 41 into the shroud chamber and the removal of the fan belt 41 through the maintenance hole 61 can be performed smoothly and efficiently. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view of a combine harvester as seen from the front side. [Figure 2] FIG. 1 is a perspective view of the combine harvester as seen from the rear side. [Figure 3] FIG. 2 is a side view showing the state in which the engine is mounted on the vehicle frame. [Figure 4] FIG. 2 is a front perspective view showing the engine and its cover structure. [Figure 5] FIG. 2 is a perspective view of a main part showing the structure of a fan shroud and a belt attachment / detachment portion. [Figure 6] FIG. 2 is an internal structural view showing the relationship between the inside of the fan shroud and the cooling fan. [Figure 7] FIG. 2 is a side view showing the fan belt, the cooling fan, and the fan shroud. [Figure 8]FIG. 10 is a rear view showing the structure for opening and closing the maintenance hole using a side cover attached to the cover frame. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of the present invention will be described with reference to the drawings. As shown in Figures 1 and 2, a combine harvester (work vehicle) 1 that simultaneously performs reaping, threshing, sorting of rice grains, and straw processing is a riding five-row, head-feeding combine harvester. A driving operation unit A is provided at the front right side of a machine frame (machine body) 3, which has left and right crawler-type traveling devices 2 attached to its lower portion, in the machine body's forward direction. A reaping unit B is provided from the front left side to the front of the driving operation unit A, and can be raised and lowered by a hydraulic cylinder (not shown). A threshing unit C is provided behind the reaping unit B, and a grain collecting unit D, such as a grain tank, is provided to the right of the threshing unit C. A straw waste processing device E is provided behind the threshing unit C and the grain collecting unit D.

[0009] The reaping section B separates the standing culms in the field into reaped and unreaped culms using a grass dividing board 4 and narrow guide 5 attached to the lower front end, and the reaped culms that fall between the left and right grass dividing boards 4 are lifted up by the claws of a lifting device 6. The culms are then raked in by a raking device (not shown) while the base of the culms is cut off by a cutting blade. Furthermore, the culms raked in by the raking device are joined together by the left, right and center raking conveying chains and the tip conveying chains that make up the lifting conveying device, and the joined culms are transported to the threshing section C by the tip / base conveying chains, with the threshing depth adjusted by the threshing depth conveying chain 7.

[0010] The threshing section C has a threshing chamber formed above the machine frame, which is made up of front and rear walls, left and right side walls, a bottom plate, and a cylinder cover 8 covering the top. The threshing chamber is equipped with a threshing feed chain 9 that clamps and transports the stalks transported from the reaping section B along the threshing mouth, clamping rails 10 attached to the cylinder cover 8, a first threshing drum with numerous threshing teeth planted around its periphery, and a receiving net. A processing chamber for processing straw waste mixed with grain that was not completely threshed in the threshing chamber is provided in parallel from the rear end of the first threshing drum toward the rear of the machine, and this processing chamber is equipped with a second threshing drum and a receiving net. Below the first and second threshing drums is a sorting chamber consisting of a oscillating sorting body and a sorting air duct, which sorts grain that has fallen through the receiving net.

[0011] The grains that have been threshed and sorted in the threshing section C are transferred to the grain tank 11 that constitutes the threshing section D, where they are temporarily stored before being discharged by the discharge auger 12 into a container or the like outside the machine. The straw chips and dust generated in the threshing section C are sucked in by a dust discharge fan installed in the sorting chamber and discharged from the dust discharge port to the rear of the threshing section C. The straw that has been discharged from the handling chamber after threshing is transported by a straw waste conveying device toward the straw waste processing device E, and the disc-type cutter (straw waste cutter) 13 that constitutes the straw waste processing device E shreds the straw transported by the straw waste conveying device and discharges it as chopped straw at the harvest site.

[0012] Next, the driving unit F that drives the traveling device 2, the reaping unit B, the threshing unit C, the grain collecting unit D, and the straw waste processing unit E will be described. The power unit F is located in an engine room 15 below a driver's seat 14 that constitutes the driving operation unit A. That is, as shown in Figure 4, a cubic cover frame 16 is erected on the machine frame 3, and an engine cover is attached to this cover frame 16 except for the lower and left sides. A vertical water-cooled four-stroke common rail diesel engine (water-cooled engine) 17 is housed inside the cover frame 16.

[0013] The engine cover is made up of a front cover 18 that covers the front side of the engine 17, a seat cover 19 to which the driver's seat 14 is attached, covers 21 (front cover 21a, top cover 21b, rear cover 21c, left cover 21d, bottom cover 21e) that constitute an air cleaner chamber 20 provided above the engine compartment 15, side covers 22 that are configured to detachably cover the side surfaces on the rear side of the engine 17, a side cover 23 that covers the right side of the cover frame 16 and is attached so as to be able to open and close freely with its rear part as a fulcrum, and a right cover 24 for the air cleaner chamber 20. Note that the side cover 23 and right cover 24 are fitted with, for example, perforated plates or mesh bodies, and clean outside air that has been removed of straw and the like by the perforated plates or mesh bodies is drawn into the engine compartment 15 and the air cleaner chamber 20 through their holes (intake ports).

[0014] 3 to 6, the engine 17 is mounted on the machine frame 3 via vibration-isolating rubber 27 so that its crankshaft faces the left and right of the machine frame 3, an output pulley 25 that drives each part of the combine 1 is located toward the center of the machine frame 3, and a cooling fan 26 faces the right side of the machine frame 3. An air cleaner is provided above the engine 17 and is housed in the air cleaner chamber 20. A muffler 30 is provided on the machine frame 3 behind the engine 17, and is connected to the engine 17 via an exhaust pipe 29. A fuel tank 31, a fuel filter 32, etc. are attached to the rear of the machine frame 3, and fuel is supplied to the engine 17.

[0015] A common rail, an oil filter, etc. are attached to the side of the engine 17 that faces the rear of the aircraft, and an exhaust manifold, an alternator 36, etc. are attached to the side of the engine that faces the front of the aircraft. The engine 17 also includes a drive pulley 37 attached to its output shaft 17a, a driven pulley 38 attached to the drive shaft of the alternator 36, an auto-tension pulley 39, a fan pulley 40 attached to the tip of a pulley shaft 40a that is journaled on the side of the engine, and a fan belt 41 wound around these. The driven pulley 38 is configured to be rotatable about the alternator 36 as a journal by a known belt transmission switching mechanism, and can be switched from a fan rotation driving state in which the belt is tensioned to a non-transmitting state in which the fan belt 41 can be loosened and removed.

[0016] Meanwhile, a radiator 57 that cools the coolant for the engine 17 is provided between the side cover 23 and the cooling fan 26, and a fan shroud 58 that sucks out hot air from the entire radiator 57 is provided on the back side of the radiator 57. That is, the radiator 57 is attached to a radiator bracket that stands upright from the body frame 3 between the cover frame 16 and the side cover 23, with grommets or the like disposed at its top, bottom, left and right sides.

[0017] The fan shroud 58 has a hollow box-shaped main body 58a that covers the entire radiator core portion of the radiator 57, and is detachably attached to the back side of the radiator 57 at necessary locations such as the four corners with bolts. In this configuration, the fan shroud 58 has a circular ventilation hole 58b formed in the center near the top of the flat, rectangular upright plate surface of the main body 58a when viewed from the side, and a peripheral wall 58c formed as a wide, band-like plate that runs along the outer periphery of the upright plate surface is bent toward the radiator 57, forming a cover structure that forms a highly rigid, rectangular air guide tube.

[0018] The configuration of the belt attaching / detaching unit 60 according to this embodiment will be described with reference to Figures 5 to 8. The fan shroud 58 is a rectangular box-shaped body with an open radiator 57 side. As shown in Figure 5, the fan shroud 58 has a wide peripheral wall 58c formed continuously around the outer periphery of the main body 58a. The fan shroud 58 has a right-hand side wall on which a wide peripheral wall 58c is formed. The right-hand side wall of the fan shroud 58c is provided with a maintenance hole 61, which is an elongated hole having a width equal to or greater than the belt width and a vertical length corresponding to the diameter of the fan, at a position facing the side of the cooling fan 26. The maintenance hole 61 is closed from the outside and can be opened and closed. The maintenance hole 61 is configured to be integral with the side cover 22, as will be described later.

[0019] As shown in Figures 7 and 8, this lid structure is configured such that a lid portion that serves as a hole cover 62 having a size and shape that allows it to close the maintenance hole 61 from the outside is formed integrally with the side (rear) cover 22 that is detachably attached to the cover frame 16 that is framed in a cubic shape on the aircraft frame 3 and covers the rear side of the engine 17, at a position opposite the maintenance hole 61 of the fan shroud 58.

[0020] In other words, the fan shroud 58 is configured so that the main body 58a and the peripheral wall 58c are approximately flush with the maintenance hole 61 and the side surface of the cover frame 16, in order to enlarge the fan shroud chamber on the right side (maintenance hole 61 side) of the ventilation hole 58b. With this configuration, when the side cover 22 is attached to the cover frame 16, the hole cover 62 serving as a lid formed on the side cover 22 faces the maintenance hole 61, and can naturally close it with less effort.

[0021] The side cover 22, which is inevitably removed when performing maintenance work around the engine or replacing a belt, can be fully opened at the same time through the side cover 22 by simply removing the attachment members such as multiple bolts attached to the cover frame 16. Furthermore, after completing maintenance work such as belt replacement, the maintenance hole 61 can be closed simultaneously and labor-savingly by the necessary work of attaching the side cover 22 to the cover frame 16.

[0022] In other words, the operation of attaching and detaching the side cover 22 to the cover frame 16 allows the opening and closing of the maintenance hole 61 to be performed simply and efficiently, and prevents problems caused by forgetting to close the maintenance hole 61, allowing for efficient and simple combine harvester operation. Furthermore, because the side cover 22 also serves as the hole cover 62, the number of parts can be reduced, resulting in a low-cost structure. The lid structure shown in the figure is configured so that mounting fixtures 63 such as screws protruding above and below the maintenance hole 61 can be attached and detached with nuts or the like to opposing positions on the side cover 22 to close the hole, which has the advantage of being able to appropriately prevent chatter vibrations of the wide side cover 22. On the other hand, in the case of a lid structure that does not use the cover frame 16, a single hole cover 62 (not shown) is provided over the maintenance hole 61.

[0023] Meanwhile, the fan shroud 58, which includes the belt attachment / detachment section 60, has a notched belt loop 65 formed at an appropriate location on the inner periphery that defines the contour of a circular ventilation hole 58b drilled in the plate surface of the main body 58a. The notched belt loop 65 allows the outer periphery of the fan belt 41 to slide freely. For example, the back side of the fan belt 41 that has been released from each pulley and is in a free state can be inserted into the belt loop 65, facilitating the operation of introducing the fan belt 41 into the shroud chamber between the fan belt 41 and the blades 26a of the cooling fan 26. The belt loop 65 in this embodiment is provided on the inner periphery of the ventilation hole 58b on the side closer to the maintenance hole 61, thereby facilitating the belt passage.

[0024] With this configuration, when the fan belt 41 in need of replacement due to deterioration or wear is removed from each pulley and taken outside the machine, and when the fan belt 41 is fed out and inserted through the belt loop 65, a portion of the back side of the fan belt 41, which may be accidentally bent in a free ring position, can be inserted into the belt loop 65 to assume a temporarily supported guide position. Next, the removed fan belt 41 is passed over the outer periphery of the cooling fan 26 and then moved into the shroud chamber formed between the cooling fan 26 and the radiator 57, where it can be picked up smoothly and easily by inserting a hand through the maintenance hole 58d and retrieved. A new fan belt can also be easily installed by following the reverse procedure.

[0025] In other words, to remove the fan belt 41, the curved portion of the fan belt 41 is passed over the cooling fan 26 or inserted between adjacent blades 26a, and the curved portion of the fan belt 41 that has entered the fan shroud 58 is pinched or hooked with the fingers of the right hand that has been inserted into the shroud chamber through the maintenance hole 61. While this is done, the fan belt 41 is pulled in one by one through the shroud chamber into the maintenance hole 61 and quickly pulled out of the machine.

[0026] This belt pulling operation has the advantage that as the fan belt 41 moves and is pulled in by the fingers inside the fan shroud 58, the fan belt 41 is picked up with the other hand and pushed in a payout manner through the belt loop 65, so that the fan belt 41, which has flexibility and belt bending rigidity and is bent in an unexpected position, can be smoothly paid out through the wide shroud chamber, which has a wide peripheral wall 58c and is configured to be easily operated by the fingers, and can be quickly removed outside the aircraft through the maintenance hole 61.

[0027] On the other hand, in the case of a fan shroud 58 having belt loops 65 formed in the ventilation holes 58b, the fan belt 41, which has been removed from each pulley and has belt flexural rigidity and is in an indeterminate free position, can be inserted into the belt loops 65 at an appropriate position to restrict and guide its sliding movement in the circumferential direction of the ventilation holes 58b, allowing for smooth belt unwinding without interference from the blades of the cooling fan 26. When a new replacement fan belt 41 is to be threaded around each pulley, the fan belt 41 is inserted into the shroud chamber through the maintenance hole 61 and wound around the cooling fan 26, and part of the curved portion is inserted into the belt loop 65 to be guided for unwinding, allowing the fan belt 41 to be quickly unwound from the ventilation holes 58b and threaded around each pulley efficiently.

[0028] Next, another embodiment of the present invention will be described, in which the same configurations and operations as those of the above embodiment will not be described. In this embodiment, the fan shroud 58 has a main body 58a having a wide peripheral wall 58c, and the ventilation holes 58b are formed with an inner diameter smaller than the outer diameter of the multiple blades 26a of the cooling fan 26 disposed within the main body 58a, and the tips of the blades of the cooling fan 26 rotate with a sufficient overlap with the main body 58a to increase the airflow pressure, and it is desirable that the blades of the cooling fan 26 are made of synthetic resin. In this case, at least the tip of each blade is flexible and can be deflected and displaced in the axial direction so as to be able to recover its original shape. Therefore, even when the belt looping portion 65 is made as small as possible, the blade tip can be bent when the belt passes through, allowing for smooth maintenance work.

[0029] In the above configuration, the belt loop 65 provided on the main body 58a can be formed with a notch of a size and shape that has a minimum depth and width that allows the fan belt 41 to easily pass over the blade tip when the fan belt is in a free position when the belt is attached or detached. This has the advantage that the curved portion of the fan belt 41 can be easily inserted into the recess of the belt loop 65 even when the blade tip is in a lapped state when viewed from the front, so that the operator can grasp the curved portion that has passed through the belt loop 65 with his other hand and pull it out smoothly and efficiently toward the other side.

[0030] Furthermore, when the belt loop 65 is formed to be deep and wide, several times its thickness, it is desirable to provide a structure with a blocking piece that closes the belt loop 65 during normal operation and can open the belt loop 65 for belt maintenance work in order to maintain air blowing efficiency. In this case, the blocking piece is preferably a structure that keeps the belt loop 65 in a closed state during normal operation and can open the belt loop 65 for belt maintenance work, for example, a structure in which the blocking piece is an elastic rubber plate member fixed to the main body 58a, or a hard plate piece that can be freely switched from a closed position to an open position.

[0031] According to the above configuration, when removing the deteriorated fan belt 41 from each pulley and taking it outside the aircraft, a portion of the fan belt 41 that has taken an unexpectedly bent ring position can be inserted into the belt loop portion 65, and then inserted between adjacent blades 26 a, and the curved portion of the fan belt 41 that is inside the fan shroud 58 can be picked up with fingers inserted into the shroud chamber through the maintenance hole 61, and the fan belt 41 can be smoothly pulled out toward the outside of the aircraft.

[0032] This belt pulling operation has the advantage that as the fan belt 41 is pulled in by the fingers within the fan shroud 58, the fan belt 41 is picked up with the other hand and pushed in through the wide-opening belt loop 65 in a payout manner, allowing the fan belt 41, which has flexibility and belt bending rigidity in the narrow belt loop space and is bent in an unexpected position, to be smoothly and quickly removed outside the payout machine.

[0033] In this belt removal operation, if the belt loop 65 is located as close as possible to the maintenance hole 61 located on the work space side of the fan shroud 58 outside the fuselage, the worker can perform the series of operations smoothly while in a working position close to the fan shroud 58, for example, by using his right hand inserted inside the fan shroud 58 to pull out the fan belt 41, while using his left hand to support the fan belt 41, which has been removed from the engine 17 side and may bend unexpectedly, in the space inside the belt loop 65 in a latched manner, while visually checking the belt feeding operation that avoids strong contact with nearby blades 26.

[0034] In the belt removal operation performed in this manner, even if the tips of the blades 26a of the cooling fan 26 are aligned with the belt loop 65 in a front view, the blades 26a, which are made of a flexible synthetic resin, can be easily bent in the axial direction by pushing or pulling them with a finger from the outside. Therefore, even if the blades 26a overlap the notches of the belt loop 65, the tips of the blades 26a can be retracted in the axial direction to widen the gap between them and allow partial passage of the fan belt 41, which has the advantage of allowing the fan belt 41 to pass easily and quickly.

[0035] After the removed fan belt 41 is removed outside the aircraft, a new fan belt 41 can be attached simply and efficiently by performing the attachment work in the reverse order of the removal work of the old fan belt 41. In addition, in the work vehicle 1 in which the above-described fan belt 41 removal and installation work is performed by opening the front cover 18, seat cover 19, etc., which are provided so as to be freely opened and closed on the driving operation unit A side, and performing maintenance work such as belt replacement through the opened cover hole, by providing the maintenance hole 61 on the upper side of the fan shroud 58, it is possible to easily perform maintenance work such as belt removal and installation work and cleaning of the radiator unit from the driving operation unit A side. [Explanation of symbols]

[0036] 1. Work vehicle (combine) 17 Engine 22 Side cover 26 Cooling fan 41 Fan belt 57 Radiator 58 Fan shroud 58a Main body 58b Ventilation hole 58c Peripheral wall 61 Maintenance hole 62 hole cover 60 Belt detachment part 65 Belt loop

Claims

1. A work vehicle (1) comprising a water-cooled engine (17), a radiator (57) for cooling the cooling water of the engine (17), a cooling fan (26) driven from the engine (17) via a ring-shaped fan belt (41) to supply cooling air to the radiator (57), and a square box-shaped fan shroud (58) having ventilation holes (58b) for the cooling fan (26), surrounding the outer periphery via a peripheral wall (58c) for guiding air, and forming a shroud chamber open on the radiator (57) side, The fan shroud (58) is characterized in that a wide peripheral wall (58c) is formed on the outer periphery of a box-shaped main body (58a) in which ventilation holes (58b) are formed, and the wide peripheral wall (58c) is integrally formed to form a continuous cylindrical body, and a belt detachment section (60) is provided on one side wall of the peripheral wall (58c) and includes a maintenance hole (61) formed as an elongated hole through which the fan belt (41) and a finger can be inserted, and a hole cover (62) that enables the maintenance hole (61) to be opened and closed.

2. 2. The work vehicle according to claim 1, wherein a belt guide portion (65) that allows and guides the passage of the fan belt (41) inserted into the ventilation hole (58b) of the fan shroud (58) is recessed and formed on an inner peripheral side of the ventilation hole (58b) near the maintenance hole (61).

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