JPS63272913A - Water cooling device for horizontal engine - Google Patents

Abstract

PURPOSE:To aim at reducing the overall height of a horizontal engine in a sound-shield type engine driven generator or the like by disposing a radiator at a lower position in a space laterally outside of the engine, and by disposing a water pump on the delivery port side of the radiator. CONSTITUTION:In a sound-shield type engine generator, a common base 5 is supported to the bottom wall 2b of a sound shield casing 2 through the intermediary of several vibration rubbers 4, and a water cooled horizontal engine 6 and a generator 7 are laterally arranged on the common base 5. A fuel tank 8 is secured to the upper wall 2c of the sound-shield casing 21. In this arrangement, a radiator 10 is arranged in a space 4 laterally outside of a cylinder head 17 located on one lateral side of the engine 6. Further, the introduction port 10a of the radiator 10 is positioned in the vicinity of the feed-out port 19 of a water jacket 19, and the delivery port 10b of the radiator 10 s positioned in the vicinity of the return port 19a of the water jacket 19, and a water pump 50 is disposed in a pipe line between the delivery port 10b and the return port 19a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a water cooling system for a horizontal engine, and is a technique for suppressing the overall height of the engine and improving cooling performance by selecting the arrangement of radiators.

(Prior Art) Conventional horizontal ennon water cooling devices include the following.

◎ Conventional example 1 (see Fig. 6) This is a 1-1 cylinder block 13 of a horizontal engine 6.
The radiator 10 is mounted on the second wall, and the lower part of the water pipe 10c of the radiator 10 is connected to the second part of the cylinder block 19 in the cylinder block 1.

◎ Conventional example 2 (f: see PJV diagram) In this case, the radiator 10 is arranged in the lateral outer space B of the crankcase 13a located on the side of the horizontal engine 6, and the radiator 10 has 10 inlets at the upper part and 10 inlets at the lower part. Outlet 1
01 is connected to the cooling water outlet 19b in the upper part of one water jacket through a flexible hot water pipe 46 and cold water pipe 47.
and connected to the lower return port 19a.

(Problem to be solved by the invention) Each of the above conventional examples has the following problems.

◎ Conventional example 1 (see Figure 6) (b) The overall height of Ennon is high.

Since the radiator 10 stands on the earthen wall of the cylinder block 13, the total height of the ennon 6 increases.

◎ Conventional example 2 (see Figure 7) (b) Pipe resistance of hot water pipes and cold water pipes is large.

The inlet 10a and outlet 10b of the radiator 10 are the outlet 19b and return port 19a of the water gloss 19.
On the other hand, since the crankcase 13a is located far away from the hot water pipe 4G and cold water? t'47 has a long overall length and a large pipe resistance, which reduces the cooling water circulation efficiency and deteriorates the cooling performance.

(c) Air pockets and steam pockets may be formed in the hot water W46.

Since the hot water pipe 46 is flexible, it has the advantage of absorbing the vibrations of the Ennon 6 and being less likely to be damaged. This tends to cause air pockets and steam pockets, and these air pockets impede the circulation of cooling water, deteriorating cooling performance.

(d) Not being able to supply enough cooling water.

When injecting cooling water from the water inlet 61 of the upper tank 60 of the radiator 10, the cooling water flows into the radiator 10.
The cooling water quickly flows from the upper tank 60 into the hanging part of the hot water pipe 46 and blocks it, so that the upstream part of the hot water pipe 46 higher than the hanging part and the upper part of the water jacket 19 are filled with cooling water. Air pockets remain.

The present invention aims to solve all of the above problems (a) to (d).

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a cooling water return port 19a in the lower part of the automatic jacket 19 of the horizontal engine 6, as shown in FIGS. 1 to 4, for example. The upper part of the radiator 10 is connected to the delivery port 19, and the upper part of the radiator 10 is connected to the inlet port 1.
0a, the outlet 1.0 is connected to the lower part, and connected to the inlet 10a of the radiator 10 with one outlet 19b and flexible hot water pipe 46, and the radiator 1
Automatic jacket 1 that connects the outlet port 10 of 0 with the cold water pipe 47
Cooling water is connected to the return port 19a of 9.
F1 absorbs heat and cools the cylinder 14 and cylinder head 17 to become high temperature water, which passes through the hot water pipe 46 to the radiator and becomes low temperature water, which is circulated from the cold water pipe 47 to one jacket. In the water cooling system for a horizontal ennon configured to
The inlet port 10a of the radiator 10 is located close to the outlet port 19b of the water jacket 19, and the outlet port ta of the radiator 10 is located close to the return port 19a of the water jacket 9. ,
A water pump 50 is interposed between the outlet port 10b of the radiator 10 and the return port 19a of the water jacket 19, and the low-temperature cooling water cooled by the radiator 10 is pumped through the return port 19a to the water jacket 19. It is constructed as follows and is characterized by p, 3s.

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

Figures 1 to 4 show one example of this, where the mi diagram is a longitudinal sectional front view of a soundproof Ennon generator, and Figure 2 is a schematic perspective view thereof.
FIG. 3 is a front external view of the engine generator, and FIG. 4 is a cross-sectional plan view of the engine generator.

In the figure, 1 is a soundproof engine generator, and 2 is its waterproof case. This soundproof case 2 is formed horizontally,
In FIG. 2, arrow F indicates the front side, arrow 4 indicates the rear side, arrow d indicates the left side when viewed from the front, and arrow R indicates the right side when viewed from the front.

The soundproof case 2 has a large surface covered, and its front wall 2
A rolling board 3 is provided on the right side of a (see Figure 3).
. Moreover, the inside of the soundproof case 2 is configured as follows.

That is, a common base 5 is supported on the bottom wall 2b via a plurality of anti-vibration rubbers 4, and a water-cooled horizontal engine 6 and a generator 7 are arranged side by side on the common base 5. A 92 cl fuel tank 8 is fixed to one side of the soundproof case 2 above the generator 7. Further, an electric radiator 10 is provided on the left side of the engine 6 as described above. This radiator 10 is
It is driven by a battery 11 placed in front of it.

First, the engine 6 will be explained.

Inside the cylinder block 13 is a cylinder 14 whose axis is oriented laterally.
The piston 15 is inserted into. Further, an oil pan 16 is provided in the cylinder block 13 from the bottom thereof, and a cylinder head 17 and a head cover 18 are fixedly provided in this order on the left side. One water jacket for engine 6 is a cylinder side jacket for cooling cylinder 14) 19c
, a head-side cylinder head 19d for cooling the cylinder head 17, and a jacket cover 20 provided on the upper part of the cylinder block 13 are communicated with each other. A plurality of intake boats 22 provided on the upper surface side of the cylinder head 17 are connected to an air cleaner 24 via an intake pipe 23. This air cleaner 24 is arranged above the battery 11. On the other hand, a plurality of exhaust boats provided on the lower surface side of the cylinder head 17 are connected to a muffler 27 via an exhaust pipe 26.

This muff 27 is provided in the rear upper part of the soundproof case 2.

Further, a crankshaft 29 projects rearward from a central portion on the rear side of the shilling block 13, and a seven-wheeler 30 is fixed to the projecting end thereof. This flywheel 30
is covered with a flywheel cover 31, and a drive pulley 32 is provided protruding from the rear surface of the flywheel 30.

Further, a starter motor 34 is fixed to the rear upper part of the shilling block 13 via a bracket 33.

A starting pinion of the starter motor 34 is meshed with a ring gear of the flywheel 30.

The starter motor 30 is connected to the battery 11.

The power generation unit 1f17 has its rotating shaft 36 arranged parallel to the crankshaft 29 of the engine 6, and a driven boob 937 is fixed to the protruding end of the rotating shaft 36.

, : A drive belt 38 is stretched between the driven pulley 37 and the drive pulley 32 (112).

Furthermore, the cooling system of Ennon 6 is configured as follows.

The radiator 10 is disposed in a lateral outer space A of a cylinder head 17 located on the side of the engine 6 (on the left side in the figure) with its air intake surface facing the cylinder head 17 side. The radiator 10 is configured as a forced ventilation type, and includes a radiator main body 42, a forced ventilation 7mm 43 provided on the ventilation inlet side, and a 7T drive motor 44. This motor 44 is connected to the battery 11.

A cooling water inlet 10a projects from the upper right side of the radiator body 42, and a cooling water outlet 10b projects from the lower right side. On the other hand, the water jacket 19
The cooling water return port 19a is connected to the jacket cover 20 at the top position (jθ), and the cooling water return port 19a is connected to the jacket cover 20 at the top position.
A cooling water outlet 19 and the like are provided in each of the two. As a result, the inlet 10a of the radiator 10 is located close to the outlet 19b of the water jacket 19, and the outlet 101+ of the radiator 10 is located close to the return port 19a of the water jacket 19.

The inlet 10a of the radiator 10 and the outlet 1]+ of the water jacket 19 are connected via a flexible hot water pipe 46, and the outlet 10b of the radiator 10 is connected to the outlet 10b of the radiator 10.
The return port +9a of one automatic jacket is connected via a flexible cold water pipe 47.

'' - A two-way pump 50 for forced circulation of cooling water is interposed in the middle of the cold water pipe 47. This water dump 50 is interlocked and connected to the crank pongee 29 of the engine 6. That is, the driven pulley 51 of the human power shaft of the auto pump 50 is fixed, and the sub-drive pulley 32a is formed inside the drive pulley 32 of the engine 6. This secondary drive boo'
A drive belt 54 is stretched between J32a and the driven pulley 51.

The Ennon generator 1 having the above configuration operates as follows.

The engine 6 is started by driving the starter motor 34 with the battery 11, and the generator 7 starts generating electricity.
As the ennon 6 is operated, the cylinder 14, cylinder head R17, 7F air trF26, etc. generate heat.

Simultaneously with the operation of the engine 6, the water pump 50 is driven via the drive belt 54, and the motor 4/1 of the radiator 10 is driven by the battery 11.
Ann 43 blows air to the radiator body 12. The sill 14 and the shilling head 17 are cooled by forcing the cooling water in one water tank to circulate through the radiator body 42 through the water pump 5o.

That is, the cooling water discharged by the water pump 50 to the radiator 10 and the oak jacket 19 absorbs heat in one oak jacket, cools the cylinder 14 and the cylinder rad 17, and becomes high-temperature water. The water passes through the hot water pipe 46 and is cooled by the radiator 10 to become low-temperature water. This low-temperature water is supplied to the cold water W47 by the water pump 50.
The cooling water is returned to the water jacket 19, thereby circulating the cooling water within the cooling system.

In addition, in the above case, as the radiator 10 operates, the outside air taken in through the outside air intake l on the right side wall 2d of the soundproof case 2 is transferred to the shilling head 17 of the generator 7/engine 6 and the exhaust gas. After cooling the pipe 26, the high-temperature water is cooled and heated in the radiator body 42, and is discharged from the air outlet of the left side wall 2e of the soundproof case 2. Note that, since the 7-an 43 is configured as a forced ventilation type, the 7-an 43 and the motor 44 are not heated by the cooling air discharged from the radiator main body 42, as in the case of a suction ventilation type configuration. Therefore, the useful life of the fan 43 and motor 44 is extended.

FIG. 5 shows an embodiment of the pond, and a different configuration from the above embodiment will be explained.

In this case, the radiator main body 42 and the radiator 43 of the radiator 10 are installed in the front-rear direction so that the cooling air passes in the front-rear direction, and the radiator 10 is configured to be belt-driven. That is, a driven pulley 45 is provided on a rotating shaft of 7 angels 43. This driven pulley 45 and the driven pulley 5 of the water pump 50 are interlocked and connected to two cranks of the engine 6 via a drive belt 54.

(Effect of the invention) The present invention has the following effects.

(b) The overall height of the engine is reduced.

Since the radiator is disposed at a low position I'll in the lateral outer space of the engine, the overall height of the engine is reduced.

(b) The flow resistance of the water-cooled pipeline is reduced.

There are no large objects such as crankcases between the inlet of the radiator and the outlet of the water jacket, and between the outlet of the radiator and the return of the water jacket, so hot water pipes and cold water pipes The length of each pipe becomes shorter. Therefore, the flow resistance of the water cooling pipe becomes smaller, the amount of circulating water increases, and the cooling performance of the water cooling device improves.

(c) There should be no air pockets in the hot water pipes.

As mentioned in item (b) above, since the flexible hot water pipe is formed in a short length, it will not hang down, bend, or collapse.

This prevents the circulation of cooling water from being obstructed due to the formation of air pockets or steam pockets in the middle of the hot water pipes, and improves the circulation capacity of the cooling water.

(d) A sufficient amount of cold power I water can be supplied.

As mentioned above, the hot water pipe has no hanging parts, so when replenishing cooling water from the radiator water inlet,
While expelling the air in the hot water pipe, the entire length of the hot water pipe and the top of the water jacket can be filled with cooling water, allowing for sufficient replenishment.

(e) The radiator can be made smaller.

Placed in a low position even if the water level in the water jacket drops due to a decrease in cooling water due to long-term engine operation, or if the engine ambient temperature is high and the amount of steam generated in the water jacket increases. Since the cooling water can be continuously circulated by the continuous automatic pump, a decrease in cooling capacity can be prevented, and the radiator can be small.

The present invention has the following effects when configured as shown in FIGS. 1 to 4 as preferred embodiments.

(a) By arranging the radiator 10 along a plane parallel to the two crankshafts of the engine 6, the total length of the engine 6 in the lateral direction is shortened, so that the entire engine 6 can be made compact.

(l)) By distributing the intake and exhaust pipes 23 and 26 of the engine 6 in opposite directions, the intake pipe 23 can be used as an exhaust gas. ? 26
Since heat reception is prevented from occurring, the charging efficiency is increased and the output of the engine 6 is improved.

(c) Even when the engine 6 is mounted inside the sealed soundproof case 2, by circulating the cooling air of the radiator 10 from the cylinder head 17 side to the radiator 10 side,
Since the exhaust heat of the cylinder 7 and 17 can be smoothly discharged to the outside of the case 2, heat is not trapped in the upper space of the soundproof case 2. Therefore, the temperature inside the soundproof case 2 is kept relatively low, and the reliability of the electrical equipment installed inside the soundproof case 2 is improved.

[Brief explanation of drawings]

Figures 1 to 5 show embodiments of the present invention, and Figures 1 to 4 are one embodiment of the invention. Figure 1 is a longitudinal sectional front view of a soundproof engine generator, and Figure 2 is a schematic thereof. The perspective view and tjS3 figure are front external views of the same engine generator, FIG. 4 is a cross-sectional plan view of the same engine generator, FIG. 5 is a partial view showing an embodiment of the pond, and FIG. 6 is a conventional example 1. Elevation view of a horizontal engine showing the
FIG. 7 is an elevational view of a horizontal engine showing conventional example 2. 6...Horizontal engine, 10...Radiator, 1
0a...Inlet, 10b...Outlet, 14
...Cylinder, 17...Cylinder head,
19... Water Shake Nto, 19 & 1...
return port, 19b... delivery port, 46... hot water pipe, 47... cold water pipe, 50... one-tabump,
A...Lateral lateral space. Patent applicant: Kubota Iron Works Co., Ltd. Figure S

Claims (1)

[Claims] 1. A cooling water return port 19a is connected to the lower part of the water jacket 19 of the horizontal engine 6, a delivery port 19b is connected to the upper part, an inlet port 10a is connected to the upper part of the radiator 10, and an outlet port is connected to the lower part. 10b, the outlet 19b of the water jacket 19 is connected to the inlet 10a of the radiator 10 with a flexible hot water pipe 46, and the outlet 10 of the radiator 10 is connected to the return port of the water jacket 19 with a cold water pipe 47. 19a, the cooling water absorbs heat in the water jacket 19, cools the cylinder 14 and cylinder head 17, becomes high-temperature water, passes through the hot water pipe 46, is cooled by the radiator 10, becomes low-temperature water, and is discharged from the cold water pipe 47. In a water cooling system for a horizontal engine configured to circulate water to a jacket 19, a radiator 10 is arranged in a lateral outer space A of a cylinder head 17 located on the side of the horizontal engine 6, and an inlet 10a of the radiator 10 is connected to the water jacket. 19, and the outlet 10b of the radiator 10 is located close to the return port 19a of the water jacket 19, and from the outlet 10b of the radiator 10 to the return port 19a of the water jacket 19. A water pump 50 is interposed between the radiator 10
A water cooling system for a horizontal engine, characterized in that the low temperature cooling water cooled by the cooling water is pumped through the return port 19a to the water jacket 19.