JPH0224227A - 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 a fuel tank on the rear upper side of an engine body, and also disposing the radiator horizontally between the engine body and a mission case. 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 disposed horizontally between the engine body 9 and a mission case situated in the rear side of said engine body which is not shown so that its core part 15 looks downward. The part at least closer to the front 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 a satisfactory 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.
0) A horizontal water-cooled engine (51) is placed near the front end of the engine with its crankcase (52) positioned forward, and a fuel tank (5) is placed above the crankcase (52).
3), and a radiator (55) was arranged above the cylinder part (54).

(Problem to be solved) In the horizontal water-cooled engine installed in conventional mobile work vehicles, the cylinder part ( 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 9 (55) are formed to fit in the upper part of the engine body (51), the capacity of the fuel tank (53) is increased. 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 fixed on the main frame (50) near the front end, and the engine mounting part is covered with a bonnet case (56), but as mentioned above, there is a radiator (55) on the upper side of the engine body (51). Since the fuel tank (53) is arranged, the overall height of the engine mounting portion at the front of the vehicle body is increased, and the height of the bonnet case (56) is also increased. As a result, there is also the problem that it is difficult to see in front of the vehicle while working.

The present invention has focused on these points, and an object of the present invention is to provide a mobile work vehicle that has sufficient cooling capacity, is capable of continuous operation, 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 arranged between the engine body and the transmission case located behind it, with its heat dissipation surface forming a horizontal surface, and at least the front part of the top surface of the hood is formed into a forward-sloping slope. That is.

(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 at the rear upper side of the engine body, and the engine body and the transmission located behind it are arranged. Since the radiator is placed between the case and the radiator so that its heat dissipation surface forms a horizontal plane, the capacity of the fuel tank can be increased without being restricted by the radiator, and the radiator also dissipates heat from the fuel tank. There will be no restrictions on area.

Moreover, since the radiator is placed between the engine body and the transmission case with its heat dissipation surface forming a horizontal plane, the center of gravity of the engine unit is located lower than when the radiator is placed on the engine body. This makes it less likely that you will fall to the left or right.

Furthermore, since the fuel tank is located at the upper rear of the engine body, there is no longer anything that protrudes high above the front of the engine body, that is, at the front end of the vehicle body, so that the top surface of the bonnet is at least at the front end of the engine body. It can be formed with a downwardly sloping front surface, which provides a wide front field of view for the working vehicle and improves 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), pull out the handle (5) from the upper rear side of the mission case (3), connect the working device (6) to the lower rear side of the mission case (3), and then pull out the main frame (4). The horizontal water-cooled diesel engine (7) and the transmission case (3) mounted and fixed on the top are interlocked and connected,
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 (10) disposed on the engine body (9), and a radiator (11).
9), as shown in Fig. 1, the crankcase part (13) is placed in the front part of the main frame (4) with the 7971 part (12) inside, and the head block part (14) is in the rear part. It is placed on the side.

The fuel tank (10) is arranged above the cylinder part (12), and the radiator (11) is arranged above the head block part (12).
4) and the transmission case (3) located on the rear side, the core part (15) is disposed horizontally with the core part (15) facing downward. This radiator ([l) is connected to the head jacket (17) formed inside the engine via a water pump (16) fixed to the main frame (4), and is also connected to the head jacket (17) formed inside the cylinder part (12). The cylinder jacket (18) is connected to a connection port (20) formed in a clay wall (19) that closes the cylinder jacket (18).

The bonnet (8) that covers the outer circumference of the engine (7)
) is the crankcase part (13) of the engine body (9)
Since there are no tall parts placed above the
Its external shape is such that the front half slopes downward toward the front.

Reference numeral (21) in the figure is an electric motor for driving a radiator fan (22).

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 reduced to a small capacity. Moreover, since the radiator (11) is located at the rear of the head block section (14), the radiator (11) and the engine body (
9) The cooling water piping connecting to the water jacket inside can be shortened.

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, or 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 connected to the engine main body and the transmission. Since the radiator's heat dissipation surface forms a horizontal plane between it and the case, it does not reduce the capacity of the fuel tank (the heat dissipation area of the radiator can be expanded). It is possible to provide a work vehicle that can perform continuous work for a long time.

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.

Also, since the fuel tank is only located at the rear of the upper side of the engine body, there is no longer a high protrusion at the front end of the upper side of the engine body, that is, the front end of the vehicle body. The upper surface can be formed into a downwardly inclined surface at least at the front portion thereof, and the forward visibility of the working vehicle can be widened, thereby improving workability.

Furthermore, since the radiator is arranged between the engine body and the transmission case 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. FIG. 1 is a vertical sectional view of a main part showing a conventional technique. 3...Mission case, 4...Main frame, 7
・・・Horizontal water-cooled engine, 8... Bonnet, 9...
・Engine body, 10... fuel tank, 11... radiator.

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 arranged between the engine body (9) and the transmission case (3) with its heat dissipation surface forming a horizontal surface, and at least the front part of the top surface of the bonnet (8) is formed into a forward-sloping slope. A mobile work vehicle equipped with a horizontal water-cooled engine that is characterized by