JPH0224226A - Mobile working vehicle loaded with horizontal water-cooled engine - Google Patents

Abstract

PURPOSE:To extend the radiating area of a radiator without reducing the capacity of a fuel tank by disposing the fuel tank on the rear upper side of an engine body, and also disposing the radiator horizontally in the front of the engine body. CONSTITUTION:A walking type cultivator is loaded with a horizontal water- cooled engine 7 in a position closer to the front part of a main frame 4. The outer circumferential part of the engine 7 is covered with a bonnet 8. In this case, a fuel tank 10 is disposed on the rear upper side of an engine body 9. A radiator 11 is horizontally disposed on the upper face of the main frame 4 in the front of the engine body 9 so that its core part 14 looks downward. The part at least closer to the front part on the upper face of the bonnet 8 is formed into an inclined plane falling frontward. Hence, the radiating area of the radiator 11 is extended without reducing the capacity of the fuel tank 10, and also a sufficient field of view in front is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a mobile work vehicle having a horizontal water-cooled engine mounted on the front portion of a main frame.

(Prior Art) Conventionally, in mobile work vehicles such as walk-behind tillers and riding tillers, as shown in FIG.
) is placed near the front end of the horizontal water-cooled engine (51) with its crankcase (52) positioned forward, and a fuel tank (53) is placed above the crankcase (52).
), and a radiator (55) was arranged above the cylinder part (54).

(Problem to be solved) In horizontal water-cooled engines installed in conventional mobile work vehicles, the water jacket around the cylinder is directly connected to the radiator (55), which is the lower tank of the radiator (55). A radiator (55) is disposed above the crankcase portion (54), and a fuel tank (53) is disposed above the crankcase portion (52). In this case, since the fuel tank (53) and the radiator (55) are formed to fit in the upper part of the engine body (51), the capacity of the fuel tank (53) is increased (if formed, the radiator The heat dissipation area of the radiator (55) becomes narrower, reducing the engine cooling capacity.
If the cooling capacity is increased by increasing the heat dissipation area of 5), there is a problem that the capacity of the fuel tank (53) becomes smaller and the continuous operation time becomes shorter.

In addition, conventional mobile work vehicles are equipped with horizontal water-cooled engines (5
1) is placed and fixed near the front end of the main frame (50), and the engine mounting part is covered with a bonnet case (56), but as mentioned above, there is a radiator (55) above the engine body (51). Because the fuel tank (53) and the fuel tank (53) are arranged, the overall height of the engine mounting area at the front of the vehicle body is high, and the height of the bonnet case (56) is also high.As a result, it is difficult to see the front when working. There are also problems.

The present invention focuses on these points and aims to provide a mobile work vehicle that has sufficient cooling capacity, can be operated continuously, and has a wide forward visibility.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a horizontal water-cooled engine in which cylinders are arranged horizontally or slightly tilted up and down, and a fuel tank is arranged above the rear part of the engine body. The radiator is disposed forward of the engine body with its heat dissipation surface forming a horizontal surface, and at least the front portion of the top surface of the bonnet is formed into a forward-sloping slope.

(Function) In the present invention, in a horizontal water-cooled engine in which the cylinders are arranged horizontally or slightly tilted up and down, the fuel tank is arranged above the rear part of the engine body, and the radiator is arranged in front of the engine body so that its heat dissipation surface is Since they are arranged in a horizontal plane, the capacity of the fuel tank can be made large without being restricted by the radiator, and the radiator's heat dissipation area is not restricted by the fuel tank either.

Moreover, since the radiator is placed in front of the engine body with its heat dissipation surface forming a horizontal plane, the center of gravity of the engine unit is located lower than if the radiator were placed above the engine body. This makes it difficult to fall from side to side.

Furthermore, since the fuel tank is located at the rear of the upper part of the engine body, and the radiator is horizontally arranged at the front of the engine body, there is no longer anything that protrudes above the front of the engine body, that is, the front end of the vehicle body, and the bonnet The upper surface can be formed into a slope that slopes downward toward the front at least at the front portion, thereby providing a wide front visibility as a work vehicle.
This will improve work efficiency.

(Example) FIG. 1 is a longitudinal sectional view of the front part of a walk-behind tiller, and FIG. 2 is a side view of the walk-behind tiller.

This tiller (1) has a main frame (
4), the handle (5) is extended from the upper rear side of the Mitsushiran case (3), the working device (6) is connected to the rear lower part of the Mitsushiran case (3), and the main frame ( 4) Interlockingly connect the horizontal water-cooled diesel engine (7) and the minocyrin case (3) mounted and fixed on top,
The outer periphery of the engine (7) portion is covered with a bonnet (8).

The engine (7) is composed of an engine body (9), a fuel tank (1O) placed on the engine body (9), and a radiator (11).
9), as shown in Figure 1, the head pro-nk part (1
2) is placed on the front side of the main frame (4) with the main frame (4) located on the rear side (transmission case side).

The fuel tank (10) is located above the rear portion (13) of the engine body (9), and the radiator (11) is located on the main frame (4) located forward of the engine body (9). It is arranged horizontally with the core part (14) facing downward. This radiator (11) is connected to a water pump (18) that is supported by a crankcase cover (17) that has a piston assembly that opens on the side surface of the cylinder bottom side of the crankcase (16) and that closes the opening.
) is connected to the head shell/nod formed in the head block of the engine through the earthen wall (1) which closes off the cylinder jacket formed in the cylinder part.
9) is communicatively connected to a connection port (20) formed in.

An illumination lamp (21) is arranged above the radiator (11). This illumination lamp (21) is connected to a radiator (1
1) is supported by a recessed portion of the front wall portion of the bonnet case (8), which is formed with a recessed portion to serve as an air guide.

The bonnet (8) that covers the outer circumference of the engine (7)
) is designed so that the front half is inclined downward in order to widen the operator's field of view.

Reference numeral (22) in the figure is an electric motor for driving a radiator fan (23).

FIG. 3 shows a variant of the invention, which comprises an illumination lamp (
2I) to the crankcase cover (9) of the engine body (9).
17) via a stay (24).

In the walk-behind tiller (1) formed in this way, the front part of the bonnet (8) can be formed low, so the forward visibility is expanded and the workability is increased, and the engine (7)
radiator (11) can be cooled by forced circulation of cooling water.
) can be made small in size. Moreover, since the illumination lamp (21) is disposed in the dead space appearing above the radiator (11), it contributes to space saving.

In the above embodiments, the radiator (11) may be of a suction type or a discharge type.

Alternatively, the engine may be mounted on the main frame with the head block positioned forward. Further, in the above embodiment, an example is shown in which the present invention is applied to a walking-type tiller, but the present invention may also be applied to a riding-type tiller (and may also be applied to other mobile work vehicles).

(Effects) In the present invention, in a horizontal water-cooled engine in which the cylinders are arranged horizontally or slightly tilted up and down, the fuel tank is arranged at the upper rear part of the engine main body, and the radiator is arranged at the front of the engine main body. Since the radiator is arranged with its heat dissipation surface forming a horizontal plane, the heat dissipation area of the radiator can be expanded without reducing the capacity of the fuel tank.

Thereby, it is possible to provide a work vehicle that can perform continuous work for a long time without affecting cooling performance.

Moreover, by placing the radiator, which was conventionally placed directly above the engine body, by placing it separately, the heat dissipation area can be expanded, and the velocity of the cooling airflow passing through the radiator can be slowed down, making it easier to use in dusty atmospheres. Entry of dust can be reduced.

In addition, since the fuel tank is only located on the upper side of the engine body near the rear, there is no longer anything that protrudes high at the upper front side of the engine body, that is, at the front end of the vehicle body, so the top surface of the bonnet is At least the front portion of the vehicle can be formed into a downwardly inclined surface, thereby providing a wide forward field of view for the working vehicle and improving work efficiency.

Furthermore, since the radiator is arranged in front of the engine body with its heat dissipation surface forming a horizontal plane, the center of gravity of the engine unit can be made low, making it difficult to tip over from side to side.

[Brief explanation of the drawing]

1 and 2 show an embodiment of the present invention, FIG. 1 is a longitudinal sectional view of the front part of the walk-behind tiller, FIG. 2 is a side view of the walk-behind tiller, and FIG. 3 is a side view of the walk-behind tiller. is a diagram equivalent to Figure 1 of the modified example,
FIG. 4 is a longitudinal cross-sectional view of a main part showing the prior art. 3... Minonyon case, 4... Main frame,
7... Horizontal water-cooled engine, 8... Bonnet, 9...
・Engine body, 10... fuel tank, 11... radiator. Patent applicant Kubota Iron Works Co., Ltd.

Claims (1)

[Claims] 1. A horizontal water-cooled engine (7) is mounted on the front part of the main frame (4) extending forward from the mission case (3), and the outer circumference of the engine (7) is covered with a bonnet (8). In a work vehicle, the engine body (9)
A fuel tank (10) is placed on the upper rear side of the
A radiator (11) is placed forward of the engine body (9) with its heat dissipation surface forming a horizontal surface, and the radiator (11) is placed in front of the engine body (9).
) A mobile work vehicle equipped with a horizontal water-cooled engine, characterized in that at least the front portion of the upper surface of the vehicle is formed into a downwardly downward slope.