1. A working vehicle is characterized in that,

the work vehicle has a traveling vehicle body having a traveling device and a coupling portion for coupling the work machine,

the running vehicle body includes:

a pair of left and right body frames extending forward and backward;

an engine mounted on the vehicle body frame and serving as a drive source for the traveling device and the working machine;

a base plate provided on the vehicle body frame;

a cooler provided on the base plate; and

a hose configured to be connected to the cooler,

the base plate has a hose through-insertion hole through which the hose is inserted,

the hose is disposed so as to extend below the base plate through the hose insertion hole and to face the engine.

2. The work vehicle according to claim 1,

the hose is disposed between a steering cylinder for steering the running gear and a crankshaft pulley provided in the engine, and a hose cover is disposed between the hose and the crankshaft pulley.

3. The work vehicle according to claim 2,

a guide member that is disposed between the left and right body frames is disposed between the engine and the steering cylinder,

the hose is arranged between the guide member and the hose cover.

4. The work vehicle according to any one of claims 1 to 3,

the work vehicle includes a relay pipe that is disposed at a lower portion of a side wall of the engine and is connected to the engine so as to relay the hose.

Background

Conventionally, as an arrangement structure of a hose connected to an oil cooler in a work vehicle, an arrangement structure having the following structure is known. That is, an oil cooler is disposed on a base plate provided on left and right vehicle body frames, and an oil hose connected to the oil cooler is taken out downward from a hole provided to either the left or right of the base plate and is disposed along the outer side of the frame (see patent document 1).

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2010-174855

However, in addition to this, since the main harness connected to the battery and the air conditioning hose connected to the condenser are also inserted through the outside of the vehicle body frame, the wiring harness is large and difficult to handle, and it is difficult to arrange the wiring harness neatly.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to provide a work vehicle including: the hose, the wire harness, and the like can be easily handled, and can be appropriately arranged without impairing the appearance.

Means for solving the problems

In order to solve the above problems and achieve the object, a work vehicle according to claim 1 is characterized in that the work vehicle includes a traveling vehicle body 1, the traveling vehicle body 1 includes traveling devices 2 and 3 and a coupling portion 7 for coupling a work implement, and the traveling vehicle body 1 includes: a pair of left and right body frames 13, 13 extending forward and backward; an engine 4 mounted on the vehicle body frames 13, 13 and serving as a drive source for the traveling devices 2, 3 and the working machine; a base plate 14 provided on the vehicle body frames 13, 13; a cooler 15 provided on the base plate 14; and a hose 16 disposed so as to be connected to the cooler 15, wherein the base plate 14 has a hose insertion hole 140 through which the hose 16 is inserted, and the hose 16 extends below the base plate 14 through the hose insertion hole 140 and is disposed toward the engine 4 side.

Effects of the invention

According to the work vehicle described in claim 1, since the hose connected to the cooler can be disposed so as to pass between the left and right body frames, it is possible to perform appropriate disposition without impairing the appearance.

Drawings

Fig. 1 is a side view of a tractor as a working vehicle of the embodiment.

Fig. 2 is an explanatory diagram showing a front region of the engine room.

Fig. 3 is an explanatory diagram showing a front region of the engine room with the battery removed.

Fig. 4 is an explanatory diagram showing a state of arrangement of a hose connecting a cooler and an engine.

Fig. 5 is an explanatory diagram showing an arrangement state of the hoses in the vicinity of the steering cylinder.

Fig. 6 is an explanatory view of the engine room as viewed obliquely from below.

Fig. 7 is a right side view in the engine room with a part omitted.

Fig. 8 is an explanatory diagram illustrating an example of the wiring harness arrangement structure on the left side of the engine.

Fig. 9 is an explanatory view of a wire harness guide that guides a wire harness.

Fig. 10 is an explanatory diagram showing a state in which a cover is attached to the EGR device.

Description of the reference symbols

1 vehicle body

2 front wheel (running gear)

3 rear wheel (running gear)

4 engines

13 vehicle body frame

14 base plate

15 Fuel cooler (cooler)

16 hose

44 crankshaft pulley

45 trunk pipe

62 steering cylinder

64 hose cover

65 guide member

140 flexible pipe through insertion hole

Detailed Description

Embodiments of the work vehicle disclosed in the present application will be described in detail below with reference to the drawings. The present invention is not limited to the embodiments described below.

First, the overall structure of a tractor as a working vehicle according to an embodiment will be described with reference to fig. 1. Fig. 1 is a side view of a tractor.

A tractor is an agricultural tractor that operates while running on its own in a field or the like. The tractor can perform a predetermined operation while riding on and traveling in a field by an operator (also referred to as a worker).

In addition, hereinafter, the front-rear direction of the tractor means the straight traveling direction of the tractor. The forward direction of the tractor is a direction from the operator's seat 8 to the steering handle 9, and the reverse direction is a backward (backward) direction. Further, the front-rear direction of the tractor is taken as a reference.

The left-right direction is a direction horizontally orthogonal to the front-rear direction. Here, the left and right sides are defined toward the "front" side in the front-rear direction. That is, in a state where the operator is seated on the operator's seat 8 and faces forward, the left-hand side is "left" and the right-hand side is "right". Further, the up-down direction refers to a direction orthogonal to the front-back direction and the left-right direction. Therefore, the front-rear direction, the left-right direction, and the up-down direction are three-dimensionally orthogonal to each other.

As shown in fig. 1, the tractor includes a running vehicle body 1, and the running vehicle body 1 includes front wheels 2 and rear wheels 3 as drive devices, and a coupling portion 7 for coupling a working machine. The traveling vehicle body 1 includes an engine 4, a hood 6 that houses the engine 4, and a cabin 11 having an operation portion. These are assembled to a pair of left and right vehicle body frames 13 which are main frames of the traveling vehicle body 1. Pedals 12 for moving the cabin 11 up and down are disposed between the front wheel 2 and the rear wheel 3. The engine cover 6 is openably and closably provided at the front portion of the traveling vehicle body 1, and covers the engine 4 in a closed state.

The front wheels 2 are a pair of left and right wheels, are positioned in the front portion of the traveling vehicle body 1, are rotatably connected to the axle 2a, and function as steering wheels. The rear wheels 3 are a pair of left and right wheels, are located at the rear of the traveling vehicle body 1, and are rotatably coupled to the axle 3 a.

In the present embodiment, the front wheels 2 and the rear wheels 3 are both four-wheel drive (4WD) running devices as driving wheels, but only the rear wheels 3 may be used as driving wheels. Further, the tractor may be configured to have a crawler-type track instead of the rear wheel 3 as the running device.

The engine 4 is a drive source of a tractor, and is a heat engine such as a diesel engine or a gasoline engine. The Power (rotational Power) transmitted from the engine 4 covered by the engine cover 6 is appropriately decelerated by a transmission (transmission mechanism) not shown, and transmitted to the front wheels 2 and the rear wheels 3 or a PTO (Power Take-off) not shown.

As shown in fig. 1, the cabin 11 is provided at an upper portion of the traveling vehicle body 1, and an operating portion provided inside includes an operator seat 8 as an operator seat, a steering handle 9 that can be operated by an operator to steer the front wheels 2, and the like. The steering handle 9 is erected on an instrument panel 10, and the instrument panel 10 is provided with a display unit (instrument panel) on an upper surface thereof for displaying various information. In the steering portion, various levers such as a main shift lever, a sub shift lever, a forward/backward shift lever, and a throttle lever, which are not shown, are provided in the vicinity of the steering handle 9. A brake pedal, a tilt pedal, an accelerator pedal, a clutch pedal, and the like, which are not shown, are provided at a lower front portion of the operator's seat 8.

Although the steering unit of the tractor according to the present embodiment is provided in the cabin 11, the steering unit may be an open type without the cabin 11.

The engine 4 has an EGR (Exhaust Gas Recirculation) system 5, and the EGR system 5 returns a part of the Exhaust Gas to the intake side of the engine 4. The EGR system 5 is provided to reduce nitrogen oxides (NOx) in the exhaust gas and improve fuel efficiency.

Fig. 2 is an explanatory diagram showing a front region of the engine room. Fig. 3 is an explanatory diagram showing a front region of the engine room in a state where the battery 61 is removed from fig. 2. The engine room is formed inside the engine cover 6.

As shown in fig. 2, a base plate 14 is provided on a pair of left and right vehicle body frames 13, 13 in a front region of an engine room, and a battery 61, a fuel cooler 15 as a cooler, a condenser (condenser)41, and a radiator 42 are arranged on the base plate 14 from the front.

The fuel cooler 15 is arranged between the battery 61 and the condenser 41 to cool fuel such as light oil so that the combustion state of the engine 4 is favorable. The condenser 41 cools a refrigerant of an air conditioner, not shown. The radiator 42 cools the cooling water of the engine 4.

In the present embodiment, the fuel cooler 15 includes a 1 st fuel cooler 151 and a 2 nd fuel cooler 152 arranged in parallel in the machine width direction. The 1 st fuel cooler 151 is provided on the side where fuel is supplied from a fuel tank, not shown, to the engine 4, and the 2 nd fuel cooler 152 is disposed on the side where the remaining fuel of the fuel supplied to the engine 4 is returned to the fuel tank.

In the front region of the engine room, the cooler is arranged as described above, and therefore, the limited space in the engine room can be effectively utilized. Further, since the fuel cooler 15 is configured to include the 1 st fuel cooler 151 and the 2 nd fuel cooler 152, the fuel temperature can be maintained within a desired temperature range, and a predetermined fuel temperature reference can be satisfied.

In addition, the condenser 41 and the radiator 42 are heat exchangers functioning as coolers as in the 1 st fuel cooler 151 and the 2 nd fuel cooler 152, but the cooler in the present embodiment is defined as the fuel cooler 15 for the sake of simplicity.

As shown in fig. 3, a hose insertion hole 140 is formed in the base plate 14 at the rear of the battery mounting space. That is, the plurality of hoses 16 connected to and extending from the 1 st fuel cooler 151 and the 2 nd fuel cooler 152 are inserted through the hose insertion holes 140 and extend below the base plate 14. The hose 16 is disposed toward the engine 4, i.e., toward the rear of the machine body. In this way, the hoses 16 are disposed inside the left and right vehicle body frames 13, 13 without being exposed outward.

In this way, the hose 16 extending from the fuel cooler 15 is led out from the engine room having a high temperature to the outside having a relatively lower temperature than the inside of the engine room through the hose insertion hole 140, thereby preventing the fuel cooled by the fuel cooler 15 from being unnecessarily heated. Further, the hose 16 is not exposed to the outside of the vehicle body frames 13, and therefore, the appearance is not impaired.

The arrangement of the hose 16 will be described in more detail with reference to fig. 4 to 7. Fig. 4 is an explanatory diagram showing a state of arrangement of the hose 16 connecting the cooler (fuel cooler 15) and the engine 4. Fig. 5 is an explanatory diagram showing the arrangement state of the hose 16 near the steering cylinder. Fig. 6 is an explanatory view of the engine room as viewed obliquely from below, and fig. 7 is a right side view of the engine room with a part omitted.

As shown in fig. 4, the hose 16 extending from the fuel cooler 15 is disposed so as to pass through the upper side of the reinforcing frame 130 located below the hose insertion hole 140 (see fig. 3), and pass between the steering cylinder 62 for steering the front wheel 2 as a steered wheel and the crank pulley 44 provided in the engine 4. In fig. 4 to 7, reference numeral 43 denotes a radiator fan that rotates via a belt by rotation of a crank pulley 44.

A hose cover 64 is disposed between the hose 16 and the crankshaft pulley 44. The hose cover 64 is formed of a plate that is stretched between the brackets 63, and also functions as a reinforcing member for the brackets 63, and the brackets 63, 63 are attached to the left and right vehicle body frames 13, 13.

As shown in fig. 5 and 6, a guide member 65 formed of a round bar is provided between the left and right body frames 13, 13 so as to be positioned between the engine 4 and the steering cylinder 62. The hose 16 is arranged to pass between the guide member 65 and the hose cover 64 (see fig. 4).

With this structure, the arrangement region of the hose 16 is limited, and the arrangement form of the hose 16 can be stabilized.

As shown in fig. 4 and 7, a relay pipe 45 is disposed at a lower portion of the right side wall of the engine 4, and the relay pipe 45 relays the hose 16 and is connected to the engine 4. The relay pipe 45 includes a 1 st pipe 451 extending in a straight line and a 2 nd pipe 452 bent in a substantially L shape.

As shown in the figure, the 1 st pipe 451 and the 2 nd pipe 452 are juxtaposed in 2 rows in the longitudinal direction so that the 1 st pipe 451 is on the upper side.

IN the present embodiment, one end (left end IN the figure) of the 1 st pipe 451 is connected to a fuel tank (not shown) via a fuel filter (not shown), a hose 16a is connected to the other end (right end IN the figure) of the 1 st pipe 451, and the hose 16a is connected to the IN side of the 1 st fuel cooler 151. On the other hand, a hose 16b is connected to the other end (right end in the drawings) of a 2 nd pipe 452, which is disposed below the 1 st pipe 451 and has one end (left end in the drawings) connected to the fuel pump 48 (see fig. 4 and 7), and the hose 16b is connected to the OUT side of the 1 st fuel cooler 151.

The 1 st tube 451 and the 2 nd tube 452 are attached to the tube support frame 46, and the tube support frame 46 is fixed to the side surface of the spindle frame 63. With such a configuration, for example, interference with a working machine attached to the front side of a tractor, such as a front loader, can be prevented.

Thus, by using the relay pipe 45, the length of the hose 16 can be shortened, and cost reduction can be achieved. The 2 nd pipe 452 can be formed of the same components, and the number of component types can be reduced.

However, it is preferable that the 1 st pipe 451 and the 2 nd pipe 452 be formed of the same material as the fuel cooler 15. In this way, the temperature of the fuel can be reduced also outside the engine compartment, separately from the fuel cooler 15.

Further, the hose 16 and the relay pipe 45 connected between the fuel filter (not shown) and the fuel pump 48 (see fig. 4 and 7) are preferably disposed at positions as low as possible as compared with the suction port of the fuel pump 48 of the engine 4. The occurrence of air stagnation in the hose 16 and the like can be prevented, and rotational fluctuation when the stagnant air is sucked by the jet pump can be prevented.

The hose 16 is disposed on the right side of the engine 4, but hoses or harnesses disposed on the left side of the engine 4 may be disposed along the pedestal 63. In the case where the front loader attachment portions 49 and 49 (see fig. 4 and 7) are provided in the pedestal 63, the front loader attachment portions 49 and 49 may be disposed below and inside the front loader attachment portions. By adopting such an arrangement, the front loader can be stably maintained in an orderly arrangement without being obstructed during installation.

The hose or the harness may be disposed along a guide attached to the upper side of the front loader attachment portion, for example. In this case, it is preferable to provide a cover for covering the tubes or the harnesses arranged along the guide. By pressing from the outside, the arrangement can be made neat. In this case, if the steering wheel hose (not shown) is disposed through a hole provided in the side surface of the bracket 63, the bulging at the time of the disposition can be suppressed.

Fig. 8 is an explanatory diagram illustrating an example of the harness arrangement structure on the left side of the engine 4. Fig. 9 is an explanatory view of a wire harness guide that guides a wire harness. In the case of illustrating an example of the wiring harness arrangement structure on the left side of the engine 4, as shown in fig. 8 and 9, a water-guiding tubular holder 47 having a substantially U-shape in cross section is attached along the shaft bracket 63, and the holder 47 has a bottom face 471 and right and left side faces 472. A hose or a wire harness is disposed inside the holder 47.

As shown in fig. 9, the holder 47 is divided into two parts in the front and rear, and therefore, handling during manufacture and mounting to the shaft holder 63 is facilitated. The arrangement structure using the retainer 47 can be applied not only to the left side of the illustrated engine 4 but also to right-side hoses and harnesses.

Fig. 10 is an explanatory diagram showing a state in which a cover is attached to the EGR system 5. The EGR system 5 shown in fig. 1 becomes extremely high temperature. Therefore, the EGR system 5 is covered with the EGR cover 500. Specifically, the EGR cover 500 is configured by integrally attaching the valve cover 510 and the cooler cover 520 via the connecting plate 530, the valve cover 510 covers the EGR valve 51 configuring the EGR system 5, and the cooler cover 520 covers the EGR cooler 52.

By providing the EGR cover 500, various hoses and harnesses including the hose 16 can be prevented from directly contacting the EGR valve 51 and the EGR cooler 52 and being damaged by heat. Further, it is possible to prevent the worker from being burned by contact.

According to the above embodiment, the following tractor is realized.

(1) A tractor having a running vehicle body 1, the running vehicle body 1 having front wheels 2 and rear wheels 3 and a coupling portion 7 for coupling a working machine, the running vehicle body 1 comprising: a pair of left and right body frames 13, 13 extending forward and backward; an engine 4 mounted on the vehicle body frames 13, 13 and serving as a drive source for the front wheels 2, the rear wheels 3, and the working machine; a base plate 14 provided on the vehicle body frames 13, 13; a fuel cooler 15 provided on the base plate 14; and a hose 16 disposed so as to be connected to the fuel cooler 15, the base plate 14 has a hose insertion hole 140 through which the hose 16 is inserted, and the hose 16 is disposed so as to extend below the base plate 14 through the hose insertion hole 140 and to face the engine 4 side.

According to this tractor, since the hose 16 connected to the fuel cooler 15 can be disposed so as to pass through between the left and right vehicle body frames 13, it is possible to easily perform appropriate disposition without impairing the appearance.

(2) In the tractor of the above (1), the hose 16 is disposed between the steering cylinder 62 for steering the front wheel 2 and the crank pulley 44 provided in the engine 4, and the hose cover 64 is disposed between the hose 16 and the crank pulley 44.

According to this tractor, the effect of (1) above is further improved, and the hose 16 can be protected from the rotation of the crank pulley 44, and the hose 16 can be prevented from being damaged.

(3) In the tractor of the above (2), the guide member 65 that is bridged between the left and right body frames 13, 13 is provided between the engine 4 and the steering cylinder 62, and the hose 16 is disposed between the guide member 65 and the hose cover 64.

According to this tractor, the effect of (2) can be further improved, and the hose 16 can be appropriately disposed in the vicinity of the engine 4.

(4) In the tractor according to any one of the above (1) to (3), the tractor includes the relay pipe 45, and the relay pipe 45 is disposed at a lower portion of the side wall of the engine 4 and connected to the engine 4 so as to relay the hose 16.

According to this tractor, the effect of any one of the above (1) to (3) is further improved, and the length of the hose 16 can be shortened, thereby enabling cost reduction.

Further effects and modifications can be easily derived by those skilled in the art. Therefore, the broader aspects of the present invention are not limited to the specific details and representative embodiments shown and described above. Accordingly, various modifications may be made without departing from the spirit or scope of the general inventive concept as defined by the appended claims and their equivalents.