JPH0466327A - Structure of prime mover of working vehicle - Google Patents

Abstract

PURPOSE:To improve the cooling performance of engine by installing an oil cooler for cooling the engine at an upper part of cylinder head while providing a wind leading cover for the engine and the cooling fan, and thereby supplying cooling air to the oil cooler and the cylinder head. CONSTITUTION:A vertical axis type engine E arranged at a front part of a machine body has an air flow-in part 11 arranged at a rear part of an engine room R with respect to a cooling fan 10 arranged above the engine E. The discharge cooling air by the cooling fan 10 is discharged to the outside of machine body in a state to cool a muffler 9 from a lower position in front of the engine room R. With the constitution, at a space being surrounded by an engine bonnet 44 in an upper part of a cylinder head 8, an oil cooler 12 is arranged in a state of falling down rearwards. The cooling air by the fan 10 is flowed to a cylinder 7, the cylinder head 8 and oil cooler 12 along an air leading cover 13 for covering the engine E and the cooling fin 10.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a work vehicle such as a tractor or a lawn mower, and more specifically, the present invention relates to a work vehicle such as a tractor or a lawn mower, and more specifically, the present invention relates to a work vehicle such as a tractor or a lawn mower, and more specifically, a vehicle equipped with a vertical shaft type engine in an engine room located at the front of the vehicle body. An air inlet for the cooling fan disposed at the top of the engine is provided at the rear of the engine room, and the engine cooling air generated by the cooling fan is discharged to the outside of the aircraft from a lower front position of the engine room. Concerning the structure of the driving part of a work vehicle.

[Conventional technology]

Conventionally, the structure of the driving part of this type of work vehicle was
One disclosed in Japanese Patent No. 2-121125 is known. According to this, the engine is configured to be forcibly cooled by cooling air from a cooling fan provided above the engine.

[Invention or problem to be solved]

However, if the engine is changed to a diesel type or its displacement is increased due to changes in specifications, etc., the exhaust heat of the engine will also increase, but the cooling effect of the engine cooling structure according to the conventional technology is not sufficient. However, there was still room for improvement as the engine began to heat up, which was an inconvenience.

The present invention aims to rationally eliminate the above-mentioned disadvantages.

[Failure to solve the problem]

The present invention provides the structure of the driving part of the work vehicle described at the beginning,
An oil cooler for cooling the engine is installed above the cylinder head of the engine, and an air guide cover is provided to cover the engine and the cooling fan so that cooling air reaches the oil cooler and the cylinder head. The present invention is characterized in that the oil cooler is tilted so as to be tilted backwards.

[For production]

According to the above configuration, (a) the engine has a cooling effect due to the heat dissipation of the oil cooler in addition to the cooling effect caused by the cooling air, so the cooling performance is improved compared to the conventional one, and it is possible to increase the displacement or change to a day cell. It becomes possible. (U) The oil cooler is located above the cylinder head, which is a dead space due to the structure of a vertical-shaft engine, so it is necessary to raise the engine head or change the engine layout to accommodate the oil cooler. Not at all.

(c) Since the oil cooler is tilted backwards, the capacity is larger than when it is placed upright, and even if dirt or other particles reach the oil cooler due to the cooling air, Because of the inclination, it also prevents dirt from adhering to and accumulating on the oil cooler, such as slipping down when the engine is stopped and being blown away when the engine is running.

〔Effect of the invention〕

Therefore, due to the effect of (a) by installing a new oil cooler, it was possible to switch to diesel engine and increase the displacement without major modifications due to the effect of (b), and the oil cooler's capacity was increased due to the effect of (c). Stable engine cooling performance was achieved through the oxidation and self-cleaning effects.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

As shown in Figure 6, a vertical shaft type engine (
E), a control section (1) is provided at the rear of the fuselage, and the power from the engine (E) is transferred to the transmission notation (3) at the rear of the fuselage via a first transmission belt (2), and a control unit (1) is provided at the rear of the aircraft. In step 4), the power is transmitted to the mowers (M) disposed on the lower abdomen of the machine, and the machine is made to be able to travel with the front steering wheel (5) and the rear drive wheel (6), which is an example of a working vehicle. The tractor is configured.

As shown in Fig. 1, the engine (E) is a liquid-cooled day cell engine, with its cylinder (7) and cylinder head (8) arranged horizontally at the front, and the muffler (9) below. In addition to the preparation, the air inflow part (1
1) is installed at the rear of the engine room (R). The cooling air generated by the cooling fan (10) is discharged from the front lower part of the engine room (R) to the outside of the machine while cooling the muffler (9).

An oil cooler (12) is installed in the space surrounded by the engine bonnet (44) above the cylinder head (8).
The cooling fan (10) is arranged tilted backwards.
Cooling air from the engine (E) and cooling fan (10
) along the air guide cover (13) covering the cylinder (7),
It flows to the cylinder head (8) and the oil cooler (
12), and the engine (E) is supported against vibration in a frame (14).

As shown in Fig. 1 and Fig. 2, a heat shield tN (15) is placed immediately after the engine (E) and placed vertically from the bottom of the engine room (F?), and is placed on the top surface of the air guide cover (13). Opening (17) corresponding to the provided air inlet (16)
A partition wall (18) having a partition wall (18) is arranged in a horizontal plane so as to be connected to the upper end of a vertical bracket plate (19) erected at a position immediately before the heat shield plate (15), and its front end is bent upward, and A seal member (20) is attached to the tip. In other words, the engine room (R) consists of a heat shield plate (15) and a partition wall (18).
), and the front and rear are almost airtightly partitioned, and the intake air in the rear engine room (21) is
Leftifier (29) and air cleaner (3), which will be described later.
It flows past the auxiliary equipment (H) such as 0) and is taken into the cooling fan (10) from above the partition wall (18).

As shown in Figure 3, a steering operation mechanism (22) is located at the bottom of the rear engine compartment (21).
A U-shaped underframe (24) facing downward in rear view is arranged straddling the pedestal (23) and connected to the heat shield plate (15) with bolts, and the upper surface of the underframe (24) is extended rearward. By bending it upward, a relay box (25) is bolted to the rear surface.

A battery (26) is mounted on the upper side of the underframe (24), and the two hook-shaped rods (27), (27) and L-shaped frame (28) are pressed against the heat shielding plate (15). The battery (26) is fixed. A retifier (29) is bolted to the right leg (24a) of the underframe (24).

There is an air cleaner (30) on the right side of the battery (26).
(bracket bolted to heat shield plate (15)) (3)
It is supported and arranged by the intake pipe (3).
2) penetrates the heat shield plate (15) and enters the front engine room (
33).

In addition, the cylinder head (8) is installed in front of the oil cooler (12).
) is provided, and a sound absorbing material (35) is attached to the inner surface of the air guide cover (34). Also, the fuel tank (T) is located on the rear fender.
It is mounted at the lower position of (36).

As shown in Figures 4 and 5, the first transmission belt (2) is wound around the input pulley (38) of the HST (37) in the transmission (3), and is connected to the input shaft (39) and the engine (E ) is spaced apart from the output shaft (40) in the lateral direction. And the support shaft (4) of the fixed tension pulley (41)
The belt (2) is tensioned by pivoting a movable tension pulley (43) biased by a spring to the belt (2).

It should be noted that the present invention is not limited to the structure shown in the accompanying drawings by adding reference numerals in the claims for convenient comparison with the drawings.

[Brief explanation of drawings]

The drawings show an embodiment of the structure of the driving part of a working vehicle according to the present invention, FIG. 1 is a side view showing the structure, FIG. 2 is a plan view showing the structure, and FIG. 3 is a view showing the vicinity of the battery mounting part. 4 is a plan view showing the tension structure of the first power transmission belt, FIG. 5 is a sectional view of the main part showing the tension structure of the first power transmission belt, and FIG. 6 is an overall side view of the lawn tractor. It is. (8)...Cylinder head, (1o)...
...Cooling fan, (12)...Oil cooler,
(13)...Guiding cover, (E)...Engine.

Claims (1)

[Claims] A vertical shaft type engine (E) is installed in the engine room located at the front of the aircraft, and an air inlet for the cooling fan (10) located at the top of the engine (E) is provided at the rear of the engine room. A driving part structure of a work vehicle configured to discharge engine cooling air generated by a cooling fan (10) from a lower front position of an engine room to the outside of the machine, the cylinder head of the engine (E) An oil cooler (12) for cooling the engine is installed in an upright position above (8), and an air guide cover (13) is provided to cover the engine (E) and the cooling fan (10) so that the cooling air can flow through the engine. A motive force structure for a working vehicle, which extends over the oil cooler (12) and the cylinder head (8), and is tilted so that the oil cooler (12) is tilted backwards.