JP5739136B2 - Work vehicle - Google Patents

Description

  The present invention relates to a work vehicle driven by a water-cooled engine.

  The water-cooled engine has a radiator through which cooling water circulates, and the cooling water circulated through the radiator is cooled by a fan driven by the engine. The radiator has an upper tank and a lower tank. The upper tank and the lower tank are connected by a number of thin tube groups, and the thin tube groups are cooled by a fan.

  Since the cooling water gradually decreases due to evaporation or the like, in a structure in which water is poured into the upper tank, the engine will overheat when the cooling water decreases. Therefore, in many cases, a reservoir tank for storing cooling reserve water is provided, and the cooling water is allowed to flow from the reservoir tank into the upper tank so as to keep the water level of the upper tank substantially constant.

  For example, Patent Document 1 discloses that a reservoir tank is disposed on the upper surface of the upper tank. In Patent Document 1, cooling water returned from the engine flows into the reservoir tank. It is supposed to be. As other conventional examples, it has been proposed to attach a reservoir tank to the side of the upper tank via a bracket, or to attach the reservoir tank to the body frame.

Japanese Patent Laid-Open No. 11-324684

  In a working vehicle such as a tractor, the height of the engine room is limited, and the reservoir tank may not be arranged on the upper tank as in Patent Document 1 due to space limitations. On the other hand, there may be no dead space around the radiator. In this case, it is difficult to adopt a method of attaching a reservoir tank to the side of the upper tank. In the meantime, the method of attaching the reservoir tank to the fuselage frame increases the cost because the pipe becomes long, and there is a risk that the flow resistance of the cooling water increases.

  This invention makes it a subject to improve such a present condition.

  Now, a fan for cooling the radiator is often supported by a fan shroud, and the fan shroud is disposed in proximity to the radiator. The inventors of the present application paid attention to this fan shroud and conceived to effectively use the fan shroud and completed the present invention.

The invention of claim 1 includes a water-cooled engine (4) having a radiator (18) and a fan (19) for cooling the radiator (18) in the traveling body (1), and the fan (19). In a work vehicle surrounded by a fan shroud (17) and covering the engine (4) and the fan shroud (17) with a bonnet (8), a reservoir tank (29) of the radiator (18) and the fan shroud (17) ) Is provided with a male engaging portion (33) and the other is provided with a female engaging portion (34), and the engaging portions (33) and (34) are fitted to each other. A reservoir tank (29) is directly attached to the fan shroud (17), and the fan shroud (17) has a shape surrounding the fan (19), and the fan shroud (1) ) On the front side of the fan (19) and an upper part of the fan (19), and the reservoir tank (29) on the rear side of the fan shroud (17) and on the upper part of the fan (19). In the fan shroud (17), a notch hole (23 ') is formed in the upper portion of the fan (19) to allow the intake hose extending from the air cleaner (23) to pass therethrough.

  In the invention of claim 1, since the reservoir tank can be attached without requiring a special support member, it is possible to prevent the structure from becoming complicated. Further, since the fan shroud is disposed near the radiator because of its function, the piping is easy to handle and the flow of the cooling water is smooth.

The reservoir tank mounting means may be fixed with screws, for example, but when fitting (engaging means) between the male engaging portion and the female engaging portion is used as in claim 1. Since no special member is required, the structure can be simplified and the mounting can be easily performed. In this case, it is preferable to employ a configuration in which attachment / detachment is performed using elastic deformation of the engaging portion as in the embodiment because attachment / detachment can be easily performed.

Fans you located between the radiator and the engine, but between the radiator and the engine, it is common to the cooling air is free to some extent of space as uniformly strikes the engine. If the reservoir tank is arranged on the back side of the fan shroud as in claim 1 , the reservoir tank can be arranged in an originally vacant dead space, so that the work vehicle becomes larger due to the provision of the reservoir tank. There is no need to change the arrangement of other members, which is advantageous in terms of design.

It is a side view of the tractor concerning an embodiment. (A) is a perspective view of a tractor in a state in which a part is omitted, (B) is a perspective view of a part centered on a radiator, and (C) is a perspective view of a part centered on the radiator viewed from the front. . (A) is a perspective view of the principal part, (B) is a separated perspective view of the principal part. (A) is a figure which shows other embodiment, (B) is BB sectional drawing of (A), (C) is a rear view which shows other embodiment, (D) is another implementation. It is a top view which shows a form.

  Next, an embodiment of the present invention will be described with reference to the drawings. This embodiment is applied to a tractor. In the following description, front / rear / left / right words are used to specify the direction, and the front / rear / left / right are based on the direction of the operator.

(1). Outline of the tractor The tractor has a traveling machine body 1 supported by left and right front wheels 2 and left and right rear wheels 3, and an engine 4 is mounted on the front part of the traveling machine body 1, and the rear side of the engine 4 Is provided with a control area having a control seat 5, and a control handle 6 is disposed in the control area. A link 7 for connecting the work machine is provided at the rear end of the traveling machine body 1. The engine 4 is covered with a bonnet 8. The engine 4 is a water-cooled diesel engine.

  The traveling machine body 1 has a cylindrical chassis (base) (not shown) that is long in the front-rear direction, and an engine body (cylinder block) 11 of the engine 4 is fixed to the front end surface of the chassis. Side frames 12 are fixed to the left and right side surfaces of the engine body 11, and a front floor plate 13 of the engine room is supported by the side frames 12 as shown in FIG. A front wheel drive unit 14 is fixed to the lower surface of the side frame 12, and a front axle case 15 is fixed to both left and right ends of the front wheel drive unit 14.

  The chassis 9 is composed of a plurality of parts separated front and rear, and a portion located below the control floor forms a mission case 9a. The rear end portion of the chassis 9 is constituted by a rear gear box (not shown), and a rear axle case (not shown) is fixed to the rear gear box.

  As can be understood from FIG. 2 (A), the engine 4 is disposed in the rear half of the engine room, and a resin fan shroud 17 is disposed in front of the engine 4. The fan shroud 17 has a substantially square shape when viewed from the front, and a radiator 18 is fitted into the fan shroud 17 from the front side. The fan shroud 17 has a ventilation hole 21 into which the cooling fan 19 is loosely fitted. A radiator hose 18 a passes through the upper portion and the lower portion of the fan shroud 17. Needless to say, the fan 19 is driven by the engine 4.

(2) Details of essential parts Details of the parts centered on the fan shroud 17 will be described below. As can be understood from FIGS. 2A and 2B, the fan shroud 17 is fixed to the front floor plate 13 of the engine room. The fan shroud 17 is roughly sized to divide the engine room back and forth, and the edge member 22 is fixed to the outer peripheral surface. The bonnet 8 can be supported by the edge member 22. An air cleaner 23 is attached to the front upper end of the fan shroud 17. The fan shroud 17 has a cutout hole 23 ′ in which the suction hose is fitted at the upper left corner.

  The fan shroud 17 has a substrate 24 having a partition function and a peripheral wall 25 that is integrally continuous with the upper end surface and the left and right end surfaces thereof. The peripheral wall 25 protrudes from both the front and rear sides of the substrate 24, and the radiator 18 is stored inside the peripheral wall 25. The radiator 18 has the same structure as that of the prior art, and as can be understood from FIG. 2A, has an upper tank 26 and a lower tank 27 and a large number of thin tubes (not shown) connecting the two. The narrow tube group is covered with a filter 27.

  As shown in FIG. 3 (A), the substrate 24 of the fan shroud 17 has a trapezoidal shape that bulges backward and has a large number of reinforcing ribs. A reservoir tank 29 is attached to a portion of the rear surface of the substrate 24 near the upper left corner (below the cutout hole 23 'into which the intake hose is fitted). An inlet 30 is provided at the upper end of the reservoir tank 29, and an outlet 31 is provided at the lower end of the reservoir tank 29. A cap 32 is attached to the injection port 30 (the cap 32 has an air bleeding function). The discharge port 31 is connected to the upper tank 26 of the radiator 18 by a pipe.

  As shown in FIG. 3B, a front side of the reservoir tank 29 is provided with a male engaging portion 33 having a reverse trapezoidal shape in front view, while the male shroud 17 is provided with a male engaging portion 33 on the fan shroud 17. A female engaging portion (rib) 34 sandwiched from both the left and right sides, and a presser claw 35 that contacts the upper surface of the male engaging portion 33 are provided. The pressing claw 35 is bent and deformed in the front-rear direction by making a notch 36 in the substrate 24.

  Therefore, when the male engaging portion 33 is pushed between the left and right female engaging portions 34 against the elasticity of the presser claws 35, the male engaging portion 33 has an inverted trapezoidal shape and cannot move downward. In this state, it is held so as not to move upward by being pressed by the pressing claw 35. When removing, the presser claw 35 is pushed against its elasticity to release the pressurization of the reservoir tank 29, and then the reservoir tank 29 is moved upward and then pulled backward. Note that the male engagement portion 33 and the female engagement portion 34 may adopt a dovetail groove method that only fits and detaches by a relative movement in the vertical direction and does not move in the front-rear direction.

  Alternatively, the upper and lower longitudinal engaging grooves or ribs may be formed on the left and right side surfaces of the reservoir tank 29, while the substrate 24 may be formed with ribs or ribs that fit into the engaging grooves from behind. In any case, an upward movement preventing means such as the pressing claw 35 is necessary. Further, the substrate 24 is provided with a claw for gripping the reservoir tank 29 from both the left and right sides, a stopper for preventing the drop, and a holding claw for preventing the upward movement, so that the reservoir tank 29 is not specially processed. Is also possible.

  The reservoir tank 29 can be attached to any part of the fan shroud 17 as long as space permits. However, if the reservoir tank 29 is provided on the rear surface of the fan shroud 17 and in the vicinity of the upper corner portion as in this embodiment, a sufficient mounting space is secured. In addition, there is an advantage that water can be smoothly passed through the radiator 18.

(3) Other Embodiments / Others In the embodiment shown in FIG. 4, a hollow reservoir tank portion 29 ′ is formed in the fan shroud 17. The fan shroud 17 is manufactured by blow molding using a resin as a material. In the embodiment shown in (A) and (B), the left and right sides of the fan shroud 17 form a reservoir tank portion 29 ′, and the other side forms a fuel cooling portion 40. Only the upper part of the left or right side of the fan shroud 17 can be formed with the reservoir tank portion 29 '. Further, the reservoir tank portion 29 'and the fuel cooling portion 40 can be formed in an arbitrary shape such as a simple straight shape.

  In the embodiment shown in FIG. 4C, an annular fuel cooling part 40 is formed around the vent hole 21, and the outer part thereof is used as a reservoir tank part 29 '. Needless to say, the fan shroud 17 may be formed with only the reservoir tank portion 29 ′ without forming the fuel cooling portion 40.

  In the embodiment shown in FIG. 4D, the reservoir tank 29 has a function of rectifying the cooling air, and the cooling air is guided by the reservoir tank 29. If comprised in this way, the engine 4 can be cooled efficiently. The reservoir tank portion 29 ′ formed integrally with the reservoir tank 29 can have a wind direction guiding function by combining the configurations of FIGS. 7A to 7C and the configuration of FIG.

  The present invention can be embodied in various ways other than the above-described embodiment. For example, since the number of reservoir tanks is not necessarily one, a plurality of reservoir tanks can be attached to the fan shroud. Further, the present invention can be applied to various work vehicles other than tractors.

  The present invention is useful when applied specifically to a work vehicle such as a tractor. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Traveling machine body 4 Engine 11 Engine main body 17 Fan shroud 18 Radiator 19 Fan 21 Ventilation hole 24 Fan shroud board 29 Reservoir tank 33 Male engagement part (engagement protrusion)
34 Female engagement part (positioning rib)
35 Holding claws constituting the engaging portion

Claims (1)

The traveling body (1) includes a water-cooled engine (4) having a radiator (18) and a fan (19) for cooling the radiator (18), and the fan (19) is surrounded by a fan shroud (17) . In the work vehicle in which the engine (4) and the fan shroud (17) are covered with a bonnet (8),
One of the reservoir tank (29) and the fan shroud (17) of the radiator (18) is provided with a male engaging portion (33), and the other is provided with a female engaging portion (34). The reservoir tank (29) is directly attached to the fan shroud (17) by fitting the engaging portions (33) (34).
The fan shroud (17) has a shape surrounding the fan (19). An air cleaner (23) is disposed on the front side of the fan shroud (17) and above the fan (19), and the fan shroud ( 17) The reservoir tank (29) is positioned on the rear side of the fan (19) on the rear surface side, and the air cleaner (23) is disposed on the fan shroud (17) above the fan (19). A notch (23 ') is formed through the extending intake hose;
Work vehicle.

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