JPH0346647B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a cooling device for a water-cooled engine for a working machine, in which a radiator is placed near the engine, and a radiator cooling fan is provided between the radiator and the engine. The present invention mainly relates to a cooling device for a water-cooled engine mounted on a working machine having a narrow engine room, such as a tractor.

"Conventional technology and its problems" In working machines and vehicles such as tractors, the radiator is generally placed in the front of the engine room and the engine is placed in the rear, but a large amount of wind cannot be expected from the running of the vehicle. The following problems arise due to the inability to secure a sufficiently large engine room and insufficient ventilation within the engine room.

(1) Warm cooling air after passing through the radiator raises the temperature in the engine compartment, often causing heat problems such as percolation and paper lock, especially in the fuel system.

(2) The temperature of the cooling air after passing through the radiator is nearly 30 degrees higher than the ambient temperature, so if this hot air stays near the engine, heat will not be radiated sufficiently from the engine surface, which will cause the radiator to cool. This increases the burden of functions and requires a radiator with greater cooling performance.

On the other hand, in Utility Model No. 52-96145, an exhaust duct was installed to avoid the engine behind the radiator, thereby avoiding a rise in temperature in the engine compartment, and directing the exhaust air to the rear of the engine. It is configured to be discharged.

However, if the hot air after passing through the radiator is finally discharged to the rear of the engine, the temperature around the operator will rise, making it difficult to maintain a good working environment.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a cooling device for a water-cooled engine for a working machine, in which a radiator is arranged near the engine, and a radiator cooling fan is provided between the radiator and the engine. In,
The radiator is arranged on the operator side of the work equipment, the radiator has a cooling air intake on the operator's seat side, and an exhaust duct is connected from the radiator to the engine side, and the exhaust duct is
It is arranged so that it passes along the side of the engine toward the front of the work machine, avoiding the engine, and the front end exhaust port opens toward the front of the work machine.

Furthermore, in the second invention, in addition to the above configuration, in order to prevent leakage of cooling air and reduce the number of attached parts, the duct is divided into upper and lower, front and rear, or left and right parts, and a fan shroud is integrally molded on the duct member. are doing.

[Example] Fig. 1 is a vertical cross section of a horizontal shaft type water-cooled engine to which the first and second inventions are applied, which is mounted on a tractor. In Fig. 1, the engine 1 is fixed to the front axle bracket 2. It is also housed in the bonnet 3 of the tractor. The radiator 4 is disposed near the rear side of the engine 1, that is, on the operator's side, and is supported by the engine 1 via a suitable bracket and rubber elastic member. A radiator cooling fan 5 is arranged between the radiator 4 and the rear surface of the engine 1. The fan 5 is fixed to a fan pulley 7 via an extension bracket 6. The fan pulley 7 is connected to a pump shaft of a water pump 19 and rotatably supported on the rear surface of the engine, and is also operatively connected to a lower drive pulley 11 via a fan belt 8. The drive pulley 11 is connected to the crankshaft 10
It is fixed to the rear end of. The crankshaft 10 is supported by the engine 1 in a horizontal position extending in the front-rear direction.

Air cleaner 13 is on the right side of engine 1.
The air cleaner 13 is connected to the right side of the engine 1 via a carburetor 14. The exhaust pipe 16 is disposed on the front side of the engine 1, extends downward, and is connected to a muffler 17 below the bonnet front wall 3a. Bonnet 3
A dash board 25 is provided on the rear side, and cooling air intakes 26 communicating into the bonnet 3 are formed on both sides of the dash board 25.

A fan shroud 18 surrounding the outer periphery of the cooling fan 5 is arranged in front of the radiator 4. At the front end of the fan shroud 18, an exhaust duct 22 is integrally molded with resin. Note that the rear end of the duct 22 in FIG. 1 is shown in cross section.

In FIG. 2, the duct 22 detours from the rear surface of the engine 1 to the left side of the engine 1, avoiding the engine 1, extends further forward, and connects to the duct portion 21 of the bonnet front wall 3a. Duct part 2
The front end of the hood 1 communicates with the atmosphere through an air outlet 20 in the front wall 3a of the bonnet. An exhaust manifold 24 on the left side of the engine 1 projects into the duct 2.

The duct 22 and the fan shroud 18 are divided into two parts by a vertical dividing plane D2 extending in the front-rear direction, and the right duct part 22a is elastically supported by the engine 1 via a suitable bracket and rubber elastic member, and the left duct part 22b The outer peripheral surface thereof is joined to the outer peripheral surface of the right duct member 22a by a plurality of bolts. A front end of the exhaust manifold 24 is connected to the exhaust pipe 16.

The water pump 19 passes through the duct 22 rearward and protrudes into the duct 22, and its pump shaft is connected to the pulley 7 as described above.

[Function] When the engine is running, the cooling air taken into the bonnet 3 from the cooling air intake 26 on the rear operator side passes through the radiator 4, enters the shroud 18 and the fan 5, and enters the duct 22. 1, is guided by the duct 22, detours to the left side of the engine 1, is further guided forward, and is discharged to the front of the tractor through the duct part 21 and the exhaust port 20.

That is, the warm cooling air after passing through the radiator 4 does not stay near the engine. Also, while passing through the duct 22, the high temperature exhaust manifold 24 is cooled down.

[Effects of the Invention] As explained above, the first and second inventions of the present application have the following effects.

(1) Warm cooling air after passing through the radiator can be quickly discharged to the outside without coming into contact with the engine, preventing the temperature around the engine from rising, thereby preventing fuel system percolation and paper. It is possible to prevent heat troubles such as locking and maintain good engine performance.

In particular, when used in a working machine with a narrow engine room, such as a tractor, the above-mentioned effect is extremely significant compared to the conventional example.

(2) Since warm cooling air after passing through the radiator can be prevented from staying around the engine, cooling by heat radiation from the engine surface can be efficiently promoted, and the burden on the cooling function of the radiator can therefore be reduced. This allows the radiator to be made smaller.

(3) The radiator is placed on the operator side of the work equipment, the cooling air intake is provided on the operator's seat side, and the warm air after passing through the radiator is discharged from the front side of the work equipment. Compared to a structure that discharges air to the rear, the impact on the operator from warm wind and dust is reduced, improving the operating environment.

In the second aspect of the invention, the exhaust duct is divided into upper and lower, front and rear, or left and right halves, and the fan shroud is integrally molded with the duct member, so that in addition to the above effects, the following effects are also obtained.

(1) Leakage of cooling air from the connection between the duct and shroud can be reduced, further improving the air guiding performance of the duct.

That is, it is possible to more reliably prevent warm cooling air from leaking to the engine surface side.

(2) By integrally molding the shroud with the duct, the number of parts can be reduced and manufacturing costs can be lowered.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a tractor equipped with a water-cooled engine to which the first and second inventions of the present application are applied;
FIG. 2 is a cross-sectional view taken from FIG. 1. 1...Engine, 4...Radiator, 5...
Cooling fan, 18...Fan shroud, 20
...Exhaust port, 22...Exhaust duct, 26...Cooling air intake.

Claims (1)

[Scope of Claims] 1. A cooling system for a water-cooled engine for a working machine in which a radiator is arranged near the engine and a fan for cooling the radiator is provided between the radiator and the engine, wherein the radiator is arranged on the operator side of the working machine, The radiator has a cooling air intake on the operator's seat side, and an exhaust duct is connected from the radiator to the engine side, and the exhaust duct passes along the side of the engine to the front of the work machine, avoiding the engine. 1. A cooling device for a water-cooled engine for a working machine, characterized in that the front end exhaust port is opened toward the front of the working machine. 2. In a cooling system for a water-cooled engine for a work machine in which the radiator is placed near the engine and a radiator cooling fan is provided between the radiator and the engine, the radiator is placed on the operator side of the work machine, and the radiator is placed on the operator's seat side. A cooling air intake is provided at the radiator, and an exhaust duct is connected from the radiator to the engine side. A water-cooled engine cooling system for a working machine, which opens toward the front of the machine and has an exhaust duct divided into upper and lower, front and rear, or left and right halves, with a radiator fan shroud integrally molded into one of the duct members. Device.