JPS63272912A - 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. 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 2. In this arrangement, a radiator 10 is arranged in a space A laterally outside of a cylinder head 17 located on one lateral side of the engine 6. Further, the introduction pert 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 is positioned in the vicinity of the return port 19a of the water jacket 19.

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 water cooling systems for horizontal engines include the following.

◎ Conventional example] (See Fig. 9) In this case, the radiator 10 is placed on the upper wall of the shilling block 13 of the horizontal engine 6, and the lower part of the water W10c of the radiator 10 is placed on the upper part of the water jacket 19 in the shilling block 13. It communicates.

◎ Conventional example 2 (see Fig. 10) In this example, the radiator 1 () is arranged in the lateral outer space B of the crankcase 13u located on the side of the horizontal engine 6,
The upper inlet 10a and lower outlet 101 of the radiator 10 are connected to the upper cooling water outlet 19 of one water jacket through flexible hot water pipes 46 and cold water pipes 47.
b and 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 tjS9 diagram) (b) The overall height of the engine is high.

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

◎ Conventional example 2 (see Figure 10) (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 LJ19 of the water gloss 19.
Since the crankcase 13a is placed far away from the crankcase 13a, the hot water pipe 4G and the cold water pipe 47 have a long overall length and a large resistance, reducing the cooling water circulation efficiency and reducing the cooling performance. make things worse.

(c) Air pockets or steam accumulation may occur in the hot water pipe 46.

Since the hot water pipe 46 is flexible, it has the advantage of absorbing the vibrations of the engine 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 lO
Since the upper tank 60 of the hot water pipe 4G quickly flows into the hanging part of the hot water pipe 4G and blocks it, the cooling water is not allowed to reach the upper part of the water jacket 19 in the upstream side of the hot water pipe 46 which is higher than the hanging part. It cannot be filled and an air pocket remains.

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

(Means for Solving the Problems) In order to achieve the second object, the present invention provides a means for returning cooling water to the lower part of the water jacket 19 of the horizontal engine 6, as shown in FIGS. 1 to 4, for example. The inlet 10a is connected to the upper part of the radiator 10, and the outlet 10b is connected to the lower part of the radiator 10. Connected to the inlet 10a of the radiator 10, the radiator 10
The derivation D10b is connected to the water jacket 19 by the cold water pipe 47.
The cooling water is connected to the return port 19a of the radiator 1, and the cooling water absorbs heat in one radiator jacket, cools the radiator 14 and the radiator 17, becomes high-temperature water, and passes through the hot water pipe 46 to the radiator 1.
In a water cooling system for a horizontal engine configured such that water is cooled at zero temperature to become low-temperature water and circulated through a cold water pipe 47 and an overjacket 19, a radiator is installed in a lateral outer space A of a cylinder head 17 located on the side of the horizontal engine 6. 10 is arranged so that the inlet 10g of the radiator 10 is located near the outlet 19b of one water jacket, and the outlet 101+ of the radiator 10 is located near the return port 19a of one water jacket. It is characterized by the following.

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

! @Figures 1 to 4 are one example of this, where Figure 1 is a longitudinal sectional front view of a soundproof engine generator, Figure 2 is a schematic perspective view thereof, and Figure 3 is a front external view of the engine generator. , FIG. 4 is a cross-sectional plan view of the engine-generating rock.

In the figure, 1 is a soundproof engine generator, and 2 is its soundproof case. This soundproof case 2 is horizontally long, and has a t
In the tS2 diagram, arrow F indicates the front side, arrow II indicates the rear side, arrow r old - 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 fabrication 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 vibration-proof rubbers 4, and a water-cooled horizontal engine 6 and a generator 7 are arranged side by side on the common base 5. A fuel tank 8 is fixed to the upper wall 2C 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 driven by a battery b disposed on the front side thereof.

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 lower part thereof, and a Rad 17 and a head cover 18 are sequentially fixed to the cylinder on the left side. One water jacket of the engine 6 communicates with the cylinder side jacket 19c for cooling the cylinder 14, the head side jacket 19d of the cylinder spatula I'17bJTj, and the shank and cover 20 provided in the second part of the cylinder block 13. It will be done. Multiple intake ports 22, 22 provided on the top side of the cylinder Rad 17
is connected to the F-crease 24 via an intake pipe 23.

This F-cleaner 24 is placed on top of the battery b. On the other hand, a plurality of exhaust boats provided on the lower surface side of the cylinder head 17 are connected to the muffler 27 via the exhaust pipe 2G.

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

Further, a crank pongee 29 is protruded rearward from a central portion on the rear side of the cylinder block 13, and a flywheel 30 is fixed to the protruding 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 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 30 is connected to the battery b.

The power generation Pb7 has its rotating shaft 36 disposed parallel to the crank pongee 29 of the engine 6, and a driven pulley 37 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.

Further, the cooling system for the engine 6 is configured as follows.

The radiator 10 is disposed in the lateral outer space [10A] of the cylinder head 17 located on the lateral side of the engine 6 (on the left side in the figure). The radiator 10 is configured as a forced ventilation type, and includes a radiator main body 42, a forced ventilation 7-an 43 provided on the ventilation inlet side, and a fan drive motor 44.
It consists of This motor 44 is connected to battery b.

A cooling water inlet 10a and a cooling water outlet 10b protrude from the upper right side and the lower right side of the main body 42, respectively. On the other hand, the water jacket 1
9, a cooling water return port 19a is provided in the head side jacket (19d) located at the lower position, and a cooling water delivery port 19b is provided in the jacket cover 20 located at the upper position. As a result, 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 b) b of the radiator 10 is located close to the return port 19a of the water jacket 19. located in Inlet port 10a of the radiator 10 and oak jacket 1
The outlet port 19b of the radiator 10 and the return port 19a of one water jacket are connected via a flexible hot water pipe 46, and the outlet port 10b of the radiator 10 and the return port 19a of one water jacket are connected via a flexible cold water pipe 47. Concatenated.

The Ennon power generation Wj,1 having the above configuration operates as follows.

By driving the starter motor 34 with the battery b, the ennon 6 is moved to Ilh, and the motor 7 starts generating electricity. As the Ennon 6 operates, the Schilling 14, Schilling 71'17, exhaust pipe 26, etc. generate heat.

Further, at the same time as the engine 6 is operating, the motor 44 of the lanoator 10 is driven by the battery b, and the 7-ring 43 blows air to the lanoeater main body 42. By naturally circulating the cooling water in one water heater through this cylinder main body 42, the cylinder 14 and cylinder head 17 are
is cooled.

That is, when the cooling water absorbs heat at the heater 9 and cools the cylinder 14 and the cylinder 17 to become high-temperature water, this high-temperature water passes through the hot water pipe 4G to the cylinder 10.
It is cooled to become low temperature water, and this low temperature water is cold water￥'f4
By returning from 7 to 1 Water Tsuyakent,
Cooling water circulates naturally within the cooling system.

In addition, in the above case, in connection with the operation of the 77n 43 of the ranoator 1o, the outside air taken in from the outside air intake port on the right side wall 2d of the soundproof case 2 is After cooling the %W26, the high-temperature water is cooled and heated in the lanoator main body 42, and is discharged from the air outlet on the left side wall 2e of the soundproof case 2. Note that since the fan 43 is configured as a forced ventilation type, it is configured as a suction ventilation type (Iη
The fan 43 and the motor 44 are not heated by the cooling air discharged from the lanoator main body 42, as would be the case if the fan 43 and the motor 44 are heated, thereby extending the useful life of the fan 43 and the motor 44.

FIG. 5 to FIG. 8 show other embodiments, and will be described with respect to a different embodiment from the above-described first embodiment.

FIG. 5 shows a second embodiment and is a partial diagram corresponding to FIG. 1. In this case, a cooling water circulation pump 50 is attached to the jacket cover 20 of the oak jacket 19, the suction L of this pump 50 is connected to the outlet 19b of the water jacket 19, and the outlet 50b of the same pump 50 is connected to the outlet 19b of the water jacket 19.
is connected to the right end of the flexible hot water pipe 46. A driven pulley 51 connected to the pump 50 is driven via a drive belt 54. 53 is Tenshikunpuri. By forcibly circulating the cooling water using the pump 50 in this manner, the heat exchange efficiency of the lanoator 10 is improved, so the lanoeater 10 can be made smaller.

FIG. 6 is a partial rear view showing the third embodiment.

In this case, a cooling water circulation pump 50 is attached to the front portion of the shilling block 13. The suction port 50a is connected to the cold water pipe 47, and the discharge port 50b is connected to the return port 19a of the water jacket 19. Further, an auto flange 55 and a thermostat cover 56 are sequentially placed on the cooling water outlet 19b provided in the upper part of the cylinder head 17.

The thermostat cover 56 is connected to the hot water pipe 46 via a thermostat 57 provided therein. The inlet side of this thermostat 57 is connected to the suction side of the pump 50 via a return path 58.

When the engine 6 is started cold and the cooling water temperature is low, the flow path of the thermostat cover 56 is closed by the thermostat 57, and the cooling water is pumped to the pump 50, inside the shilling block 13, inside the shilling head 1f, and into the auto flange 55. - It is circulated through the return path 58. engine 6
As the cooling water temperature increases as the unit is operated, thermostat 5
7 opens the flow path of the cover 56, and the cooling water flows from the water 7 lunge 55 to the hot water W46, the lanoator 10, the cold water pipe 47,
It is circulated through the path of the pump 50. By providing the water flange 55 as described above, the thermostat cover 56 and the thermostat 57 can be easily attached.

Note that, instead of the above configuration, the cooling water circulation path may be such that it flows from the rad 17 to the shilling block 13 to the water flantz 55.

FIG. 17 and the ptSB diagram show the third embodiment, FIG. 7 is a view corresponding to FIG. 6, and FIG. 8 is a sectional view taken along the line ■-■ in FIG. 7. In this case, the mounting structure of the starter motor 34 is configured as follows.

That is, the bottom portion of the wheel cover 31 of the flywheel 30 is projected upward, and a box-shaped bracket 33 is formed by the projection. A starter motor 34 is fixed to the front side of this box-shaped bracket 33 (left side in FIG. 8). Starting pinion 34a of this starter motor 34
is meshed with the ring gear 30a of the seven lie wheel 30. Bracket 3 of starter motor 34 as described above.
Since the bracket 3 is formed into a box shape, the rigidity of the bracket 33 is increased. Therefore, even if the engine 6 is vibration-proofly supported via the vibration-proof rubber 4, the bracket 33 will not be damaged by the vibrations of the engine 6.

Further, the drive belt 54 of the cooling water circulation pump 50 is constituted by a link belt. As a result, the tension pulley can be omitted, which simplifies the structure of the engine 6, and also eliminates the trouble of applying a belt tension of 3 to 4 seconds. Furthermore, it becomes possible to replace the pump drive belt 54 without removing the power generation rock drive belt 38, which facilitates maintenance.

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

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

Since the radiator is disposed at a lower position 1d in the lateral outer space of the engine, the overall height of the engine is reduced.

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

Since there are no large objects such as crankcases between the radiator inlet and the outlet of the overheater jacket, and between the radiator outlet and the return port of the outer jacket, the hot water pipe And the length of each cold water pipe becomes shorter. For this reason, the flow resistance of the water-cooled pipeline is reduced,
The amount of circulating cooling 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 (0) above, since the flexible hot water pipe is formed in a short length, it will not droop, 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. This is particularly effective when the original cooling water circulation capacity is small, such as when the water cooling device is configured with a natural circulation system.

(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.

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 crank pongee 29 of the engine 6, the overall length of the engine 6 in the lateral direction is shortened, so that the entire engine 6 can be made compact.

(b) By sorting 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. F2
Since heat reception from the engine 6 is prevented, the charging efficiency is increased and the output of the engine 6 is improved.

(e) The engine 6 is placed inside the dense 1'lj-shaped soundproof case 2.
Even when the radiator 10 is installed, by circulating the cooling air of the radiator 10 from the cylinder head 17 side to the radiator 10 side, the exhaust heat of the cylinder head 17 can be smoothly discharged to the outside of the case 2. There will be no more clutter. 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 7 show embodiments of the present invention, and FIGS. 1 to 14 show one embodiment of the invention, in which FIG. 1 is a vertical sectional front view of a soundproof engine generator, and FIG. Figure 3 is a front external view of the engine power generation rock, Figure 4 is a cross-sectional plan view of the engine power generation rock, Figure 5 is a partial view showing the second embodiment, and Figure 6 is the third embodiment. 7 and 8 show the fourth embodiment, FIG. 7 is a partial view, and FIG. 8 is a partial view of the seventh embodiment.
9 is an elevational view of a horizontal engine showing the conventional example, and FIG. 10 is an elevational view of the horizontal engine showing the conventional example 2. 6...Horizontal engine, 10...Radiator, 1
0a...Inlet, 10b...Outlet, 1.
1...Cylinder, 17...Scilling no l',
19...Tsu Ota no Yakesoto, 19u...Return]-1, 191J...Output 1'', ・16...Hot water pipe, ・17...Cold water pipe, t\...Horizontal outer sky 1 river. Patent applicant: Kubo Til + Iron Works Co., Ltd. Figure 9

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 10b of the radiator 10 is connected to the return port 19a of the water jacket 19 with a cold water pipe 47. The cooling water absorbs heat in the water jacket 19, cools the cylinder 14 and the 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 flows from the cold water pipe 47 to the water jacket. In the water cooling system for a horizontal engine configured to circulate water to the water jacket 19, the radiator 10 is arranged in the lateral outer space A of the cylinder head 17 located on the side of the horizontal engine 6, and the inlet 10a of the radiator 10 is connected to the water jacket 19. A water cooling device for a horizontal engine, characterized in that the water cooling device is located close to the outlet port 19b of the radiator 10, and the outlet port 10b of the radiator 10 is located close to the return port 19a of the water jacket 19.