JPH0220427A - Mobile working vehicle with horizontal water cooled engine - Google Patents

Abstract

PURPOSE:To enlarge the heat radiating surface of a radiator by placing the radiator in such a way that the heat radiating surface at the front side of the engine body is inclined upward and forming a bonnet so that the upper face of the bonnet is inclined with at least front-side part thereof down. CONSTITUTION:A fuel tank 10 is placed above a cylinder part 12 and a radiator 11 is placed at the upper side of a crankcase part 13 with the core part 15 of the radiator slanted upwards. The lower tank 16 of this radiator 11 is connected via a water jacket stuck to a main frame 4 to a head jacket 18 which is formed inside the head block of the engine. A bonnet 8 surrounding the engine part 7 is formed to give such an appearance that the front half of the bonnet 8 is inclined with the front part downward along the radiator 11 placed obliquely upwards at the upper side of the crankcase part 13 of the engine body 9.

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, the main two A (5
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 (51) is placed on one side of the crankcase (52).
53) and a radiator (55) above the cylinder portion (54).

(Problem to be solved) In the horizontal water-cooled engine installed in conventional mobile work vehicles, the cylinder part is directly connected to the radiator (55) with the lower tank of the radiator (55) being formed with the weeter jacket around the cylinder. A radiator (55) is disposed above the radiator (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), if the capacity of the fuel tank (53) is made large, the radiator (55) ), the heat dissipation area of the radiator (5) 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 mounted and 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, the engine body (51) is
Since the radiator (55) and fuel tank (53) are arranged on the − side, 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 the cylinders are arranged horizontally or inclined slightly downward by -L, and the fuel tank is arranged above the rear part of the engine body. In addition, the radiator is arranged on the front side of the engine body with its heat dissipation surface slanted and oriented in the L direction, and at least the front part of the top surface of the bonnet is formed into a front-down inclined surface.

(Function) In the present invention, in a horizontal water-cooled engine in which the cylinder is arranged horizontally or slightly tilted up and down, the fuel tank is arranged at the upper rear part of the engine body, and the radiator is arranged at the front side of the engine body as a heat radiation surface. Since the fuel tank is arranged in a diagonal -L direction, the fuel tank can be made larger without being restricted by the radiator, and the radiator's heat dissipation area is also restricted by the fuel tank. disappears.

Moreover, since the fuel tank is located at the rear of the -L side of the engine body, the front part of the engine body
In other words, since there is no high protrusion at the front end of the vehicle body, the -L surface of the bonnet can be formed into a forward-sloping surface at least in the front part, which provides a wide front view as a work vehicle and improves work efficiency. This will increase the

(Example) FIG.
The figure is a side view of the walk-behind tiller, and FIG. 3 is a schematic plan view of the front part of the walk-behind tiller.

This tilling fi (1) extends the main frame (4) forward from the mission case (3) which pivotally supports the running wheels (2), and also extends the handle (4) from the upper rear side of the mission case (3). 5), connect the working device (6) to the rear lower part of the transmission case (3), and connect the horizontal water-cooled diesel engine (7) and the transmission case (3), which are mounted and fixed on the main frame (4). are interlocked and connected, and 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 (ta) is placed on the front side of the main frame (4) with the cylinder part (12) inside, and the head protrusion part (14) It is placed so that it is located on the rear side.

The fuel tank (10) is arranged above the cylinder part (12), and the radiator (11) is arranged above the crankcase part (12).
3) The core portion (15) is disposed on the upper side of the body so that it faces forward and diagonally upward. This radiator (
11,)'s lower tank (16) is the main frame (4)
- A head jacket (18) formed within the engine head block via a taper (17)
The upper tank (19) of the radiator (11) closes the cylinder jacket (20) formed inside the cylinder part (12). It is connected to a connection port (22) formed in the earthen wall (21).

Bonnet 1-( that covers the outer circumference of the engine (7) part
8) is the crankcase part (13) of the engine body (9).
radiator (11) placed diagonally above )
The exterior shape is such that the front half slopes downward toward the front.

The symbol (23) in the figure is a radiator fan formed by a centrifugal fan fixed to the power extraction shaft (24).
Cooling air is guided to the core portion (15) of the radiator (11) by a wind guide case (25) covering the outer periphery of the radiator fan (23).

In the walking type combing machine (1) formed in this way, the front part of the bonnet (8) can be formed low, so the forward visibility is expanded, workability is increased, and the engine (7) is forced to cool the engine (7). Since cooling can be performed through circulation, the radiator (11) can be made to have a small capacity.

In the above embodiments, the radiator (9) 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, the cylinders are arranged horizontally or slightly tilted up and down (the fuel tank is arranged at the rear of the upper side of the engine body in a two-part horizontal water-cooled engine, and the radiator is arranged in the rear part of the upper side of the engine body). The heat dissipation surface is slanted towards the front.
Since it is arranged in the L direction, the heat dissipation area of the radiator can be expanded without reducing the capacity of the fuel tank.

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

Furthermore, by separately placing the radiator, which was conventionally placed directly on two sides of the engine body, the heat dissipation area can be made wider, so the flow velocity of the cooling airflow passing through the radiator can be reduced to less than 1. Therefore, it is possible to reduce the intrusion of dust in a dusty atmosphere.

In addition, the fuel tank is placed at the upper rear of the engine body, and the radiator is placed with its heat dissipation surface facing diagonally. As a result, there is no need for a high protrusion at the upper front part of the engine body, that is, at the front end of the vehicle body, and the upper surface of the bonnet can be formed into a front curved slope at least at the front part, which improves the appearance of the work vehicle. This creates a wide forward field of view and improves work efficiency.

[Brief explanation of the drawing]

Figures 1 to 3 show embodiments of the present invention, in which Figure 1 is a longitudinal cross-sectional view of the front part of the walking type dusting machine, Figure 2 is a side view of the walking type dusting machine, and Figure 3 is a side view of the walking type dusting machine. 4 is a schematic plan view of the front part of the walking type sieving machine, and FIG. 4 is a longitudinal sectional view of the main part showing the prior art. 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. Figure 1 Figure 3

Claims (1)

[Claims] 1. A mobile work vehicle in which a horizontal water-cooled engine (7) is mounted on the front part of the main frame (4), and the outer periphery of the engine (7) is covered with a bonnet (8), comprising: A fuel tank (10) is arranged on the rear upper side of the main body (9), and a radiator (11) is arranged on the front side of the engine main body (9) with its heat dissipation surface facing diagonally upward. A mobile work vehicle equipped with a horizontal water-cooled engine, characterized in that at least the front portion of the vehicle is formed with a downwardly downward slope.