JPS63314308A - Water cooling device for horizontal multicylinder engine - Google Patents

Abstract

PURPOSE:To contrive at making compact an engine and to improve cooling capacity by setting up a radiator in a side space of the engine, and making this radiator come nearer to a water jacket, while deflecting an inlet and an outlet of each of suction and exhaust manifolds respectively. CONSTITUTION:A radiator 10 is set up in a side space A of a cylinder head 17 being situated at the side of a horizontal single-cylinder engine 6. And, a hot water inlet 10a and a cooling water outlet 10b of the radiator 10 are made to approach a hot water outlet 19b and a cooling water inlet 19a of a water jacket 19 respectively. In addition, with the longitudinal center of the cylinder head 17 as a criterion, an inlet X of a suction manifold 23a is deflected to one side, while an outlet Y of an exhaust manifold 26a is deflected to the other side. A suction pipe 23 and an air cleaner 24 are set up in the same one side with the inlet X, while an exhaust pipe 26 and a muffler 27 are set up at the same other side with the outlet Y. On the other hand, a cooling water inlet is set up in the longitudinal one side at a lower surface of the water jacket 19.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a water-cooled cooling device for a horizontal multi-cylinder engine.
This technology makes the entire engine more compact and improves cooling performance.

(Prior Art) Conventional water-cooled cooling systems for horizontal engines include the following.

◎ Conventional example 1 (see Fig. 5) In this example, the radiator 10 is mounted on the upper wall of the cylinder block 13 of the horizontal engine 6, and the water pipe 10c of the radiator 10 is mounted on the upper part of the water jacket 19 inside the cylinder block 13. The lower part is connected.

◎ Conventional example 2 (see Fig. 6) In this example, a radiator]0 is arranged in the lateral outer space B of the crankcase 13a located on the side of the horizontal engine 6, and the hot water inlet 10a in the upper part of the radiator 10 and the cold water in the lower part are connected. The outlet 10b is connected to the upper hot water outlet 19b and lower cold water inlet 19a of the water jacket 19 via flexible hot water pipes 46 and cold water pipes 47.

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

◎ Conventional example 1 (see Figure 5) (b) The overall height of the engine is high.

Since the radiator 10 stands up on the upper wall of the cylinder block 13, the overall height of the engine 6 increases.

◎ Conventional example 2 (see Figure 6) (b) Pipe resistance of hot water pipes and cold water pipes is large.

Since the hot water inlet 10a and the cold water outlet 10b of the radiator 10 are located far apart from the hot water outlet 19b and the cold water inlet 19a of the water jacket 19 with the crankcase 13a in between, the hot water pipe 46 and the cold water pipe 47 have a long overall length. The pipe resistance becomes large, reducing the cooling water circulation efficiency and worsening the cooling performance.

(c) Air pockets and steam pockets are formed in the hot water pipe 46.

Since the hot water pipe 46 is visible, it has the advantage of absorbing the vibrations of the engine 6 and being less likely to be damaged. However, because it is long, it can sag, bend, or collapse, and the upstream side of the sagging part may be damaged. Air pockets and steam pockets are likely to occur, and these air pockets obstruct the circulation of cooling water, deteriorating cooling performance.

(d) Insufficient supply of cooling water.

Water inlet 42c of seven-bar tank 42a of radiator 10
When cooling water is injected from the upper tank 42a of the radiator 10, the cooling water quickly flows from the upper tank 42a of the radiator 10 into the hanging part of the hot water pipe 46 and blocks it. The upstream portion of the water jacket 19 and the upper part of the water jacket 19 cannot be filled with cooling water, and air pockets remain.

The present invention solves all of the above problems (a) to (d),
The purpose is to package the entire engine into one compact unit and improve cooling performance.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention aims to improve the upper surface of the cylinder head 17 located on the side of the horizontal multi-cylinder engine 6, as shown in FIGS. 1 to 4, for example. Each intake bolt 22 is opened on one side and the lower surface, and each exhaust port 25 is opened on the other side, and an air cleaner 24 is connected to each intake port 22 via an intake manifold 23a and an intake pipe 23, and each exhaust bolt 22 is opened on the other side. A muffler 27 is connected to the port 25 via an exhaust manifold 26a and an exhaust pipe 26, a hot water outlet 19b for cooling water is opened at the upper part of the water jacket 19 of the horizontal multi-cylinder engine 6, and a cold water inlet 19a is opened at a lower part thereof. A hot water outlet 10a is provided in the upper part of the radiator 10, a cold water outlet 10b is provided in the lower part, and the hot water outlet 19b of the water jacket 19 is communicated with the hot water inlet 10a of the radiator 10 via a flexible hot water pipe 46. The outlet 10b is communicated with the cold water inlet 19a of the water jacket 19 via the cold water pipe 47, and the cooling water absorbs heat in the water jacket 19 and cools the cylinder 14 and the cylinder head 1.
7 becomes high-temperature water, passes through the hot water pipe 46, heat is radiated by the radiator 10, becomes low-temperature water, passes through the cold water pipe 47,
In a water cooling system for a horizontal multi-cylinder engine configured to circulate water through a water jacket 19, a radiator 10 is disposed in a lateral outer space A of a cylinder head 17 located on a lateral side of a horizontal multi-cylinder engine 6. The hot water inlet 10a of the radiator 10 is located close to the hot water outlet 19b of the water jacket 19, and the cold water outlet 10b of the radiator 10 is located close to the cold water inlet 19a of the water jacket 19.
7, the intake manifold 2
The inlet X of the exhaust manifold 26a is shifted to one side in the longitudinal direction, and the outlet Y of the exhaust manifold 26a is shifted to the other side, and the intake pipe 23 and the air cleaner 24 are placed on the same side as the inlet X of the intake manifold 23a. At the same time, an exhaust pipe 2 is provided on the same side as the outlet Y of the exhaust manifold 26a.
6 and muffler 27 are provided, and the lower manifold 26a (
Water jacket 19 on the side opposite to the eccentric side of 23a)
It is characterized by having a cold water inlet 19a opened at one side of the front and back of the lower surface of the machine.

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

Fig. 1 is a cross-sectional plan view of the soundproof engine generator, Fig. 2 is a schematic perspective view thereof, Fig. 3 is a longitudinal sectional front view, and Fig. 4 is a sectional view taken along the line IV--IV in Fig. 3. Ru.

In the figure, 1 is a soundproof engine generator, and 2 is its soundproof case. This soundproof case 2 is formed in a horizontally long shape, and arrow F in FIG. 2 indicates the front side, arrow H indicates the rear side, and the arrow R indicates the left side when viewed from the front, and the arrow R indicates the right side when viewed from the front. are shown respectively.

The soundproof case 2 has a large surface covered in a sealed manner, and the inside thereof is configured as follows. That is, the bottom wall 2b
A common base 5 is supported via a plurality of anti-vibration rubbers 4,
On this common base 5, a water-cooled horizontal two-cylinder engine 6 and a power generation fi7 are installed side by side on the left and right. A fuel tank 8 is fixed to the upper wall 2c of the soundproof case 2 above this power generation 8!17. In addition, an electric radiator 1 is installed on the left side of the engine 6.
0 is set. In addition, in the figure, 2a is a front wall, and 2f is a rear wall.

First, the horizontal two-cylinder 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 protruding from the lower part of the cylinder double block 13, and a cylinder head 17 and a head cover 18 are sequentially fixed to the left side thereof. The water jacket 19 of the engine 6 includes a cylinder jacket 196 for cooling the cylinder 14,
A jacket cover 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 ports 22 provided on the upper front part of the cylinder head 17 are connected to an air cleaner 24 via an intake manifold 23a and an intake pipe 23.

Is the inlet X of the intake manifold 23a connected to the cylinder? The intake pipe 23 and the air cleaner 24 are also disposed in the front section inside the soundproof case 2, and are deviated toward the front side with respect to the center in the front-rear direction of the soundproof case 2.

On the other hand, a plurality of exhaust ports 25 provided at the rear portion of the lower surface of the cylinder head 17 are connected to the exhaust manifold 26 &
and is connected to a muffler 27 via an exhaust pipe 26. The outlet Y of the exhaust manifold 26a is deviated toward the trailing side,
An exhaust pipe 26 and a V-muffler 27 are also provided in the rear part of the soundproof case 2.

Further, a crankshaft 29 projects rearward from a center portion on the rear side of the cylinder block 13, and a seven-wheeler 30 is fixed to the projecting end thereof. This flywheel 30
is covered with a flywheel cover 3], and a driving boo 932 is provided protruding from the rear surface of the flywheel 30.

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

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

The starter motor 34 is connected to the battery 11.

The generator 7 has an input shaft 36 disposed parallel to the crankshaft 29 of the engine 6, and a large force pulley 37 is fixed to the protruding end of the input shaft 36.

A drive belt 38 is stretched between this manual pulley 37 and the drive pulley 32.

Further, the cooling system of the Ensif '6 is constructed as follows.

The radiator 10 is arranged in a lateral outer space A of a cylinder head 17 located on the lateral side of the engine 6 (on the left side in the figure) with its air intake surface facing toward the cylinder head 1f side. The radiator 10 is configured as a forced ventilation type, and includes a radiator main body 42, a forced ventilation fan 43 and a fan drive motor 44 provided on the ventilation inlet side thereof.

The hot water outlet 10a is supplied from the upper tank 42a of the radiator body 42, and the cold water outlet 1 is supplied from the lower tank 42).
0b are provided in a protruding manner. The above upper tank 42a
A water inlet 42c is provided on the upper side. On the other hand, one of the water jackets has a cold water inlet 19a (see Fig. 4) in the bottom front part of the water jacket 19d in the lower position, and a hot water outlet 19 in the jacket cover 20 in the upper position.
b are provided respectively. As a result, the radiator 10
The hot water population 10a is located close to the hot water outlet 19b of the water jacket 19, and the radiator 1
The cold water outlet 10b of the water jacket 19 is located close to the cold water inlet 19a of the water jacket 19. The above radiator 10
The hot water inlet 10a of the radiator 1O and the hot water outlet 19b of the water jacket 19 are connected via a flexible hot water pipe 46, and the cold water outlet 10b of the radiator 1O and the cold water inlet 19a of the water jacket 19 are connected to each other via a flexible cold water pipe 46. They are connected via a tube 47.

A water pump 50 for forced circulation of cooling water is interposed in the middle of the cold water pipe 47. This water pump 50 is interlocked and connected to the crankshaft 29 of the engine 6. That is,
A manual pulley 51 is connected to the auto pump 50, and a pump drive pulley 32a is formed inside the drive pulley 32 of the engine 6. This pump drive pulley 32
A drive belt 54 is stretched across the gap between a and the pump pulley 51.

The engine 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 power generators 8!7 start generating power.

As the engine 6 operates, the cylinder 14, cylinder head 17, exhaust pipe 26, 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 44 of the radiator 10 is driven, so that the 7-ring 43 blows air to the radiator body 42. The cylinder 14 and cylinder head 17 are cooled by forcibly circulating the cooling water in one water jacket through the radiator body 42 via the over pump 50. That is, the head jacket 1 is pumped from the cold water inlet 19a by the over pump 50.
The cooling water discharged to cylinder jacket 19c
While the hot water flows out through the hot water outlet 19b, the cylinder 14
and the cylinder head 17 to become high-temperature water, and this high-temperature water passes through the hot water pipe 46 and radiates heat in the radiator 10 to become low-temperature water. The low-temperature water is returned to the water jacket 19 from the cold water pipe 47 by the over-bomb 50, thereby circulating the cooling water within the cooling system.

In the above case, as the fan 43 of the radiator 10 operates, the outside air intake port 3 of the right side wall 2d of the soundproof case 2
After cooling the cylinder head 17 and exhaust pipe 26 of the generator 7 and engine 6, the outside air taken in from d is heated by cooling high-temperature water in the radiator body 42, and is heated through the air outlet on the left side wall 2e of the soundproof case 2. Ejected from 3e. In addition, since the 7-an 43 is configured as a forced ventilation type, the 7-7 ann 43 and the motor 44 are not heated by the hot air discharged from the radiator main body 42, as would be the case if the 7-an 43 was configured as a suction ventilation type. The useful life of the 77 engine 43 and motor 44 is extended.

In the above embodiment, the intake port 22 is formed on the upper surface of the cylinder head 17, and the exhaust port 25 is formed on the lower surface, but instead of this, the exhaust port 25 is formed on the upper surface of the cylinder head 17, and the intake port 22 is formed on the lower surface. may be formed.

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

(b) The overall height of the engine becomes lower.

Since the radiator is located at a low position in the space outside the side of the engine, the overall height of the engine is reduced to 1.5 degrees.

(b) The flow resistance of the water-cooled pipe becomes smaller.

Since there are no large objects such as crankcases between the hot water inlet of the radiator and the hot water outlet of the water jacket, and between the cold water outlet of the radiator and the cold water inlet of the water jacket, each hot water pipe and cold water pipe Piping length 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) Air pockets in hot water pipes are eliminated.

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) Sufficient supply of cooling water.

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) Since the air cleaner and muffler are placed on opposite sides of the shilling head, the exhaust gas discharged from the muffler is less likely to mix with the intake air taken in by the air cleaner, and the intake gas flowing through the air cleaner and intake pipe is less likely to mix with the muffler. Since it is less likely to be heated in the fuel tank or exhaust pipe, charging efficiency increases and engine output increases.

(F) The intake pipe and exhaust pipe are piped apart from each other and do not interfere with each other, so they can be simply connected by piping, and the piping work does not take much time.

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

(,) By arranging the radiator 10 along a plane parallel to the crankshaft 29 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.

(b) Even when the engine 6 is mounted inside the sealed soundproof case 2, the exhaust heat of the cylinder head 17 can be transferred to the outside of the case 2 by circulating the cooling air of the radiator 10 from the cylinder head 17 side to the radiator 10 side. Since heat can be discharged smoothly, heat will not be 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]

1 to 4 show embodiments of the present invention, FIG. 1 is a cross-sectional plan view of a soundproof engine generator, FIG. 2 is a schematic perspective view thereof, and FIG. 3 is a longitudinal sectional front view of the engine-generating rock. 4 is a sectional view taken along the line EV-IV in FIG. 3, FIG. 5 is an elevational view of a horizontal engine showing conventional example 1, and FIG. 6 is an elevational view of a horizontal engine showing conventional example 2. It is a diagram. 6...Horizontal multi-cylinder engine, 10...Radiator, 10a...Hot water inlet, 10b...Cold water outlet 1.14...Cylinder, 17...Silling head, 19...Water jacket, 19a...
Cold water inlet, 19b...Hot water outlet, 22...Intake port, 23...Intake pipe, 23a...Intake manifold, 24...Air cleaner, 25...Exhaust port, 26...Exhaust pipe , 26a...exhaust manifold, 27...muffler, 46...hot water pipe,
47... Cold water pipe, A... Lateral outer space, X... Inlet of intake manifold 23a, Y... Outlet of exhaust manifold 26a.

Claims (1)

[Claims] 1. Each intake port 22 is provided on one of the upper and lower surfaces of the cylinder head 17 located on the side of the horizontal multi-cylinder engine 6.
, each exhaust port 25 is opened on the other surface, and an air cleaner 24 is connected to each intake port 22 via an intake manifold 23a and an intake pipe 23, and an air cleaner 24 is connected to each exhaust port 25 via an exhaust manifold 26a and an exhaust pipe 26. Connect the muffler 27 to the upper part of the water jacket 19 of the horizontal multi-cylinder engine 6, open the hot water outlet 19b of the cooling water at the upper part of the water jacket 19, open the cold water inlet 19a at a lower part thereof, and open the hot water inlet 1 at the upper part of the radiator 10.
0a, a cold water outlet 10b is opened at the bottom thereof, a hot water outlet 19b of the water jacket 19 is connected to the hot water inlet 10a of the radiator 10 via a flexible hot water pipe 46, and a cold water outlet 10b of the radiator 10 is connected to the hot water inlet 10a of the water jacket 19. The cooling water communicates with the cold water inlet 19a via the cold water pipe 47, and the cooling water absorbs heat within the water jacket 19, cools the cylinder 14 and the cylinder head 17, becomes high-temperature water, and enters the hot water pipe 46.
In a water-cooling system for a horizontal multi-cylinder engine configured such that water passes through the radiator 10, radiates heat to become low-temperature water, passes through a cold water pipe 47, and circulates to the water jacket 19. The radiator 10 is arranged in the lateral outer space A of the cylinder head 17, and the hot water inlet 10a of the radiator 10 is connected to the water jacket 1.
In addition to being located close to the hot water outlet 19b of No. 9,
The cold water outlet 10b of the radiator 10 is located close to the cold water inlet 19a of the water jacket 19, and the inlet X of the intake manifold 23a is offset to one side in the longitudinal direction with the center of the cylinder head 17 in the longitudinal direction as a reference. At the same time, the outlet Y of the exhaust manifold 26a is shifted to the other side, the intake pipe 23 and the air cleaner 24 are provided on one side that is the same as the inlet X of the intake manifold 23a, and the outlet Y of the exhaust manifold 26a is provided on the other side that is the same as the inlet X of the intake manifold 23a. The horizontal type is characterized in that an exhaust pipe 26 and a muffler 27 are provided on one side, and a cold water inlet 19a is opened on the front and rear sides of the lower surface of the water jacket 19 on the opposite side to the eccentric side of the lower manifold 26a (23a). Water-cooled cooling system for multi-cylinder engines