JPH0648101Y2 - Horizontal engine water cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION << Industrial Application Field >> The present invention relates to a water-cooling type cooling device for a horizontal engine, and is a technique for improving the cooling performance while compacting the entire engine.

<< Prior Art >> As a conventional technology of a water-cooling type cooling device for a horizontal engine, there is one disclosed in Japanese Utility Model Publication No. 51-21036. With the axial direction of the crankshaft as the front-back direction, the crankshaft is projected rearward from the rear surface of the cylinder block, the cold water inlet is opened in the lower surface of the cylinder head, and the cold water pipe outlet end is connected to this cold water inlet. is there. Further, a hot water outlet of the water jacket is opened on the upper surface of the cylinder block, and the inlet end of the hot water pipe is connected to the hot water outlet.

In this conventional technology, there is no description about the water pump, but if a water pump is attached to the hot water outlet of the water jacket or in the middle of the hot water pipe, the water vapor generated in the water jacket flows into the water pump, and the cooling water is circulated by idling. When the water pump is attached, it is necessary to attach the water pump in the middle of the cold water pipe or at the cold water inlet of the cylinder head.

<< Problems to be Solved by the Invention >> The above-mentioned conventional techniques have the following problems (i) to (iv).

(I) The cold water inlet of the cylinder head is connected to the outlet end of the cold water pipe. For this reason, all of the intake pipe, the exhaust pipe, and the cold water pipe are connected to the cylinder head, and the design of the cylinder head is greatly restricted by the competition of the mounting locations of these pipes. Even when a water pump is attached to the cold water inlet of the cylinder head, the design of the cylinder head is greatly restricted by the installation location of the intake pipe, the exhaust pipe, and the water pump.

(Ii) When a water pump is attached in the middle of a flexible cold water pipe, the axial distance between the crankshaft and the pump shaft changes due to engine vibration. Therefore, if the water pump is driven from the crankshaft via the winding transmission belt, the winding transmission belt may slip due to fluctuations in the shaft distance, and the engine may be insufficiently cooled due to insufficient rotation of the water pump. .

(Iii) When a water pump is attached in the middle of the cooling pipe or at the cold water inlet on the lower surface of the cylinder head, the axial distance between the pump shaft and the crank shaft becomes long, and the pump shaft and the crank shaft may not be oriented parallel to each other. For this reason, if the structure is such that the water pump is driven from the crankshaft via the winding transmission belt, the winding transmission belt becomes long, and in some cases, it is necessary to wind the winding transmission belt in a twisted state. Takes up space for the transmission mechanism.

(Iv) The rear space of the cylinder block is left unused as a dead space adjacent to the flywheel of the crankshaft, etc., and the entire engine cannot be compactly assembled.

An object of the present invention is to provide a water cooling type cooling device for a horizontal engine, which can solve the above problems.

<< Means for Solving the Problems >> As shown in FIGS. 1 to 5, the present invention provides a hot water outlet 19b for cooling water at the upper portion of the water jacket 19 of the horizontal engine 6 and a cold water outlet at a lower portion thereof. Open the inlet 19a, hot water inlet 10a at the top of the radiator 10 and cold water outlet 10b at the bottom.
Open the hot water outlet 19b of the water jacket 19 to the hot water inlet 10a of the radiator 10 via a flexible hot water pipe 46, the cold water outlet 10b of the radiator 10 to the cold water inlet 19a of the water jacket 19 a cold water pipe 47. The horizontal engine 6 with the cylinder 14 axially oriented in the left-right lateral direction.
The water cooling type cooling device for a horizontal engine, which is configured by disposing the radiator 10 in the lateral outer space A of the cylinder head 17 located on the lateral side of the above, is characterized as follows.

That is, with the axial direction of the crankshaft 29 as the front-rear direction and the protruding portion side of the crankshaft 29 protruding from the cylinder block 13 as the rear side, the flywheel 30 is fixed to the rearwardly protruding portion of the crankshaft 29, and the cylinder block A pump mounting seat 57 is formed in a portion of the rear surface of the cylinder 13 that is offset from the portion facing the flywheel 30 toward the cylinder head 17 side.
The water pump 50 is attached to the pump mounting seat 57, the outlet end of the cold water pipe 47 is connected to the suction port 50a of the water pump 50, and the pump shaft 60 of the water pump 50 is attached.
Project rearward in parallel with the rearward projecting portion of the crankshaft 29,
The pump drive wheel 32a is fixed to the rear protruding portion of the crankshaft 29, the pump input wheel 51 is fixed to the rear protruding portion of the pump shaft 60, and the winding transmission belt 54 is provided between the pump drive wheel 32a and the pump input wheel 51. It is characterized by being wrapped in a series.

<< Embodiment >> An embodiment of the present invention will be described below with reference to the drawings.

1 to 5 show one embodiment thereof, FIG. 1 is a vertical sectional front view of a soundproof engine generator, and FIG. 2 is a schematic perspective view thereof.
3 is a cross-sectional plan view, FIG. 4 is a sectional view taken along the line IV-IV in FIG. 1, and FIG. 5 is a rear view of the engine.

1 to 3, 1 is a soundproof engine generator and 2 is a soundproof case. The soundproof case 2 is formed in a laterally long shape with the axial direction of the cylinder 14 as the lateral direction. The arrow F in FIG. 2 indicates the front side, the arrow H indicates the rear side, and the arrow L indicates The front view left side is shown, and the arrow R shows the front view right side, respectively.

The soundproof case 2 is covered on six sides in a hermetically sealed manner, and the inside thereof is constructed 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 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 above. The radiator 10 is driven by a battery 11 arranged on the front side of the radiator 10. In the figure, 2a is a front wall and 2f is a rear wall.

First, the engine 6 will be described.

In the cylinder block 13, a piston 15 is inserted into a cylinder 14 whose axis is laterally oriented. The same as above cylinder block 13
An oil pan 16 is vacantly installed in the lower part of the cylinder, and a cylinder head 17 and a head cover 18 are sequentially fixed to the left part.
The water jacket 19 of the engine 6 includes a cylinder jacket 19c for cooling the cylinder 14, a head jacket 19d for cooling the cylinder head 17, and a jacket cover 20 provided on the upper portion of the cylinder block 13 in communication with each other. An intake port provided on the front side of the cylinder head 17 is connected to an air cleaner 24 via an intake pipe 23. The air cleaner 24 is arranged above the battery 11. On the other hand, the exhaust port provided on the rear surface side of the cylinder head 17 is connected to the muffler 27 via the exhaust pipe 26. This muffler
27 is provided in the rear part of the soundproof case 2.

Further, the crankshaft 29 is projected rearward from the central portion on the rear surface side of the cylinder block 13, and the flywheel 30 is fixed to the protruding end thereof. The flywheel 30 is covered with a flywheel cover (not shown), and a drive pulley 32 is provided so as to project from the rear surface of the flywheel 30. Further, the starter motor 34 is fixed to the upper portion of the cylinder block 13 at the rear side through a bracket 33.

The starter pinion of the starter motor 34 is meshed with the ring gear of the flywheel 30. The starter motor 34 is connected to the battery 11.

In the generator 7, the input shaft 36 is arranged in parallel with the crankshaft 29 of the engine 6, and the input pulley 37 is fixed to the projecting end of the input shaft 36. A drive belt 38 is stretched between the input pulley 37 and the drive pulley 32.

Moreover, the cooling system of the engine 6 is configured as follows.

The radiator 10 is arranged in the lateral outer space A of the cylinder head 17 located on the lateral side (left side in the drawing) of the engine 6 with the air-absorption surface facing the cylinder head 17 side. The radiator 10 is the same as that of the above-described radiator, but it is a ventilation body.
42, a forced draft fan 43 and a fan driving motor 44 provided on the draft inlet side. The motor 44 is connected to the battery 11.

The radiator body 42 has a hot water inlet 10a protruding from the upper tank 42a and a cold water outlet 10b protruding from the lower tank 42b. A water injection port 42c is provided above the upper tank 42a.
Is provided. The hot water outlet 19b of the cooling water is opened in the upper part of the water jacket 19 of the horizontal engine 6, the cold water inlet 19a is opened in the lower part thereof, the hot water inlet 10a is opened in the upper part of the radiator 10, and the cold water outlet 10b is opened in the lower part. The hot water outlet 19b of the radiator 10 is communicated with the hot water inlet 10a of the radiator 10 via a flexible hot water pipe 46, the cold water outlet 10b of the radiator 10 is communicated with the cold water inlet 19a of the water jacket 19 via the cold water pipe 47, and the cylinder The radiator 10 is arranged in the lateral outer space A of the cylinder head 17 located on the lateral side of the lateral engine 6 with the axial direction of 14 as the left-right lateral direction.

Then, with the axial direction of the crankshaft 29 as the front-rear direction and the protruding portion side of the crankshaft 29 protruding from the cylinder block 13 as the rear side, the flywheel 30 is fixed to the rearward protruding portion of the crankshaft 29, and the cylinder block A pump mounting seat 57 is formed on a portion of the rear surface of the rear surface 13 which is displaced from the portion facing the flywheel 30 toward the cylinder head 17 side, the water pump 50 is mounted on the pump mounting seat 57, and the suction port of the water pump 50 is formed. Connect the outlet end of the cold water pipe 47 to 50a, and connect the pump shaft 60 of this water pump 50.
Project rearward in parallel with the rearward projecting portion of the crankshaft 29,
The pump drive wheel 32a is fixed to the rear protruding portion of the crankshaft 29, the pump input wheel 51 is fixed to the rear protruding portion of the pump shaft 60, and the winding transmission belt 54 is provided between the pump drive wheel 32a and the pump input wheel 51. It is wrapped in a series. The impeller 61 of the water pump 50 is fixed to the front end of the pump shaft 60. Further, reference numeral 58 in FIG. 4 is a pump casing of the water pump 50, and in FIG. 5, this pump casing is shown.
I have removed 58.

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

By driving the starter motor 34 with the battery 11, the engine 6 is started and the generator 7 starts generating electricity. With the operation of the engine 6, the cylinder 14, the cylinder head 17, the exhaust pipe 26, etc. generate heat.

Further, at the same time when the engine 6 is operating, the water pump 50 is driven via the drive belt 54, and the radiator is
The motor 44 of 10 is driven by the battery 11, and the fan 43 blows air to the radiator main body 42. By forcibly circulating the cooling water in the water jacket 19 to the radiator main body 42 via the water pump 50, the cylinder 14 and the cylinder head 17 are cooled. That is, the cooling water discharged from the cold water inlet 19a to the cylinder jacket 19c by the water pump 50 is guided to the head jacket 19d by the guide plate 70 shown in FIG.
While flowing out from the hot water outlet 19b via 9c, the cylinder 14 and the cylinder head 17 are cooled to become high temperature water, and this high temperature water is radiated by the radiator 10 via the hot water pipe 46 to become low temperature water. The low-temperature water is returned from the cold water pipe 47 to the water jacket 19 by the water pump 50, so that the cooling water circulates in the cooling system.

Further, in the above case, the outside air sucked from the outside air intake port 3d of the right side wall 2d of the soundproof case 2 along with the operation of the fan 43 of the radiator 10 is the cylinder head 17 of the generator 7 / engine 6 and the exhaust pipe 26. After being cooled, the radiator main body 42 cools and heats the high-temperature water, and is discharged from the outlet 3e of the left side wall 2e of the soundproof case 2. Since the fan 43 is configured as a forced draft type, the fan 43 and the motor 44 are not heated by the hot air discharged from the radiator main body 42 as in the case of the suction draft type. The service life of the fan 43 and the motor 44 is extended.

FIG. 6 shows another embodiment in which the mounting structure of the water pump 50 is changed as follows. That is, the side cover 59 that covers the rear opening of the cylinder block 13 is provided,
The water pump 50 is mounted on the pump mounting seat 57 formed on the side cover 59.

<< Effect of Invention >> This invention has the following effects.

A water pump is attached to the cylinder block, and the outlet end of the cold water pipe is connected to the suction port of this water pump. For this reason, the water pump and the cold water pipe do not conflict with the intake pipe and the exhaust pipe at the mounting location in the cylinder head, and the restrictions on the design of the cylinder head are reduced.

A water pump is attached to the cylinder block. Therefore, the axial distance between the pump shaft and the crank shaft does not fluctuate due to the vibration of the engine, slippage of the winding transmission band due to this fluctuation is prevented, and insufficient cooling of the engine due to insufficient rotation of the water pump is prevented. It

A water pump is attached to the cylinder block, and the pump shaft is parallel to the crank shaft. For this reason, the distance between the pump shaft and the crank shaft is shortened, and the winding power transmission belt can be wound without twisting, so that the transmission mechanism can be placed in a small space.

A water pump is attached to a portion of the rear surface of the cylinder block, which is offset from the portion facing the flywheel to the cylinder head side. Therefore, the rear space of the cylinder block adjacent to the flywheel of the crankshaft is effectively used as the space for disposing the water pump. For this reason, the entire engine is compactly integrated.

The present invention has the following effects when it is configured as shown in FIGS. 1 to 3 shown as the preferred embodiment.

(A) By arranging the radiator 10 along a plane parallel to the crankshaft 29 of the engine 6, the overall length in the lateral direction of the engine 6 becomes short, so that the entire engine 6 can be made compact.

(B) By distributing the intake and exhaust pipes 23 and 26 of the engine 6 in opposite directions, the intake pipe 23 is prevented from receiving heat from the exhaust pipe 26, so that the charging efficiency is increased and the engine 6
Output is improved.

(C) Even when the engine 6 is mounted in the closed soundproof case 2, the cooling air of the radiator 10 is circulated from the cylinder head 17 side to the radiator 10 side, so that the exhaust heat of the cylinder head 17 is discharged to the outside of the case 2. Since it can be smoothly discharged, heat is not trapped in the upper space of the soundproof case 2. Therefore, the temperature inside the soundproof case 2 is kept at a relatively low temperature, and the reliability of the electric equipment mounted inside the soundproof case 2 is improved.

[Brief description of drawings]

1 to 6 show an embodiment of the present invention, FIGS. 1 to 5 show one embodiment thereof, FIG. 1 is a vertical sectional front view of a soundproof engine generator, and FIG. 2 is a schematic view thereof. Fig. 3 is a perspective view, Fig. 3 is a cross-sectional plan view of the engine generator, and Fig. 4 is IV-IV of Fig. 1.
FIG. 5 is a rear view of the engine, and FIG. 6 is a partial view showing another embodiment. 6 ... Horizontal engine, 10 ... Radiator, 10a ... Hot water inlet, 10b ... Cold water outlet, 13 ... Cylinder block, 14
…… Cylinder, 17 …… Cylinder head, 19 …… Water jacket, 19a …… Cold water inlet, 19b …… Hot water outlet, 29…
… Crankshaft (rotating shaft), 30… Flywheel, 32a
...... Pump drive wheel (pump drive pulley), 46 …… Hot water pipe, 47 …… Cold water pipe, 50 …… Water pump, 51 …… Pump input wheel (Pump input pulley), 54 …… Wrapping power transmission (Drive) Belt), 57 ... Pump mounting seat, 60 ... Pump shaft, A
...... Lateral space.

Claims (1)

[Scope of utility model registration request] 1. A water jacket 19 for a horizontal engine 6.
The hot water outlet 19b of the cooling water is opened at the top of the radiator, the cold water inlet 19a is opened at the lower portion thereof, and the hot water inlet 10a is provided at the top of the radiator 10.
Open the cold water outlet 10b at the bottom, and
The hot water outlet 19b of 9 is connected to the hot water inlet 10a of the radiator 10 via a flexible hot water pipe 46, and the cold water outlet 10 of the radiator 10 is connected.
Cylinder head which is connected to the cold water inlet 19a of the water jacket 19 via the cold water pipe 47 and has the axial center direction of the cylinder 14 as the left and right lateral directions and is located on the lateral side of the horizontal engine 6.
The radiator 10 is arranged in the lateral outer space A of 17,
In a water-cooled cooling device for a horizontal engine, the axial center of the crankshaft 29 is the front-rear direction, and the protruding portion side of the crankshaft 29 protruding from the cylinder block 13 is the rear side. 30 is fixed, a pump mounting seat 57 is formed on a portion of the rear surface of the cylinder block 13 that is displaced from the portion facing the flywheel 30 toward the cylinder head 17 side, and the water pump 50 is mounted on the pump mounting seat 57. The outlet end of the cold water pipe 47 is connected to the suction port 50a of the water pump 50, the pump shaft 60 of the water pump 50 is projected rearward in parallel with the rearward projecting portion of the crankshaft 29, and the crankshaft
The pump drive wheel 32a is fixed to the rear projecting portion of 29, and the pump input wheel 51 is fixed to the rear projecting portion of the pump shaft 60, and the transmission belt 5 is wound around the pump drive wheel 32a and the pump input wheel 51.
A water-cooled cooling system for a horizontal engine, characterized in that 4 is wound in series.