JPH0723692B2 - Horizontal engine water cooling system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a water cooling type cooling device for a horizontal engine, and is a technique for strongly cooling a cylinder head and simplifying a water pump support structure.

<< Basic Structure as Premise >> Some water cooling type cooling devices for horizontal engines have the following basic structure.

For example, as shown in FIG. 1 to FIG. 5, FIG. 6, FIG. 7, or FIG. 8, a cooler 10 such as a radiator is arranged at substantially the same height as the water-cooled horizontal engine 6, and the water-cooled horizontal engine 6 is provided. The cooling water in the water jacket 29 is circulated to the water jacket 29 by the water pump 60 through the hot water pipe 56, the cooler 10 and the cold water pipe 57.

<< Prior Art >> As a structure for embodying the basic structure described above, there is a structure shown in FIG. 8 (Japanese Utility Model Publication No. 47-10583) in the related art.

This is because the cooler 10 is arranged in the lateral side space of the water-cooled horizontal engine 6, the jacket inlet 31a is provided on the lower surface of the head jacket 31 of the cylinder head 17, and the jacket outlet 30a is provided at the upper portion of the cylinder jacket 30. A water pump 60 is provided in the middle of 57.

<< Problems to be Solved by the Invention >> The above conventional structure has the following problems.

(B) It is difficult to strongly cool the entire cylinder head.

Generally, in a water-cooled horizontal engine, for example, as shown in FIG. 5, head jacket outlet holes are formed in the upper and lower portions of the central portion of the head jacket 31 in the front-rear direction (directions of arrows F and H).
31b is open.

Conventionally, the cooling water pumped by the water pump 60 is the jacket inlet 31a shown in the one-dot chain line in FIG.
Is blown upward from the center of the head jacket 31 in the front-rear direction, and a large amount of air flows from the upper end of the blow-up into the cylinder jacket 30 through the upper outlet hole 31b. It becomes difficult for water to rotate, and it is difficult to cool the entire cylinder head 17 with sufficient strength.

(B) The heat distortion of the engine is large.

In the cylinder head 17, the central portion in the front-rear direction is strongly cooled, while the front and rear both sides are not cooled so much, so that the temperature difference between them is large and thermal distortion is likely to occur.

(C) The support structure and transmission structure of the water pump are complicated.

First of all, because it is necessary to provide a dedicated pump support frame to support the water pump 60, the water pump
The structure for supporting the 60 is complicated.

Next, in order to drive the water pump 60, the simplest structure is to interlockly connect the pump shaft to the rotary shaft of the engine 6 via a winding transmission device such as a belt. The pump input wheel must be accurately aligned in the direction of the pump shaft with respect to the pump transmission wheel that is fixed to the rotary shaft that protrudes in the front-rear direction from the water pump 60 on the pump support frame. It is necessary to provide a means for adjusting and moving in the direction.

Therefore, the support structure and transmission structure of the pump are complicated.

(D) The total length of the engine is long.

Since the cooler 10 is arranged in the lateral outer space of the engine 6,
The total length of the engine 6 in the lateral direction is inevitably long.

The present invention strongly cools the entire cylinder head,
The object is to reduce the thermal distortion of the cylinder head, to simplify the support structure and transmission structure of the water pump, and to shorten the overall length of the engine.

<< Means for Solving the Problems >> In order to achieve the above-mentioned object, the present invention provides a cylinder in the basic structure as shown in, for example, FIG. 1 to FIG. 5, or FIG. 6 and FIG. A water pump 60 is attached to one front and one side of the head 17, a jacket inlet 31a of the head jacket 31 is opened on one front and one side of the cylinder head 17, and the discharge port 60b of the water pump 60 is directly connected to the front and back of the jacket inlet 31a. The cooling water discharged from the discharge port 60b is allowed to flow in the head jacket 31 in the front-rear direction, and the heads are respectively positioned above and below the flow of the cooling water in the head jacket 31 in the front-rear direction. The jacket outlet hole 31b is opened, and the pump input wheel 61 and the radiator fan 53 are fixed to the protruding shaft portion 70a protruding to the front and rear outside of the pump shaft 70 in the front and rear direction of the water pump 60. Pump driving wheel 63, meshed transmission belt 64 to the rotary shaft A protruding in the longitudinal direction on one side outside the front and rear Jin 6 and pump input wheel 61
The pump shaft 70 is interlocked and connected via the radiator fan 53
It is characterized in that the radiator 10 is arranged so as to face one outside of the front of the radiator.

<< Operation >> The present invention operates as follows.

Discharge port 60b of water pump 60 and head jacket inlet 3
Since it is directly communicated with 1a, the cooling water pumped by the water pump 60 becomes a vigorous flow that collides from one side in the front-rear direction of the cylinder head 17 to the other side wall. Then, the flow colliding with the other side wall is divided into a shunt flow circulating above and a shunt flow circulating below. Here, since the head jacket outlet holes 31b are provided at positions above and below the flow in the head jacket 31, the cooling water circulates in the front and rear side portions of the head jacket 31, and the respective head jackets 31a and 31b are provided. It will flow into the cylinder jacket 30 from the outlet hole 31b. As described above, after circulating the cooling water in the head jacket 31, the cooling water is caused to flow out from the head jacket outlet holes 31b provided at the upper position and the lower position, so that the entire cylinder head 17 is covered. It can be cooled evenly and strongly.

<< Effects of the Invention >> The present invention has the following effects because it is configured and operates as described above.

(B) The entire cylinder head can be cooled strongly.

(A) Increase in cooling water pressure and water amount Since the discharge port of the water pump and the head jacket inlet are directly connected, the pressure loss of the water pump is small, and when the water pump of the same capacity is adopted, It is possible to increase the cooling water pressure and the amount of water.

(B) Cooling water satisfactorily circulates in the entire cylinder head Since the cooling water flows in the head jacket in the front-rear direction, head jacket outlet holes are provided above and below this flow, respectively. The diverted cooling water does not immediately flow out, but flows out after circulating through the entire head jacket. Therefore, the cooling water can sufficiently flow to both front and rear parts of the head jacket.

Further, the effects of (A) and (B) described above can strongly cool the entire cylinder head.

(B) Thermal distortion of the cylinder head is reduced.

As described above, since the entire cylinder head is strongly cooled, the cylinder head is soaked and the thermal strain is reduced.

(C) The support structure and transmission structure of the water pump are simplified.

First of all, since the water pump is attached to the cylinder head, a dedicated pump support frame can be omitted.

Next, since the positioning accuracy of the water pump can be obtained during machining of the cylinder head, when aligning the pump input wheel of the water pump in the pump shaft direction with respect to the pump transmission wheel fixed to the engine rotation shaft, It is not necessary to adjust and move the water pump in the direction of the pump shaft, and the structure for adjusting and moving can be omitted.

Therefore, the support structure and transmission structure of the water pump are simplified.

Further, since the water pump and the radiator fan can be driven at the same time, the transmission device dedicated to the radiator fan can be omitted, and the entire transmission structure of the engine can be simplified.

(D) The total length of the engine becomes shorter.

Since the radiator and the radiator fan are arranged between the front outer space or the rear outer space of the engine, the overall length of the engine in the lateral direction is shortened.

«Examples» Examples of the present invention will be described below with reference to the drawings.

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

In the figure, 1 is a soundproof type engine generator, and 2 is a soundproof case. The soundproof case 2 is formed in a laterally long shape, the arrow F in FIG. 2 indicates the front side, the arrow H indicates the rear side, the arrow L indicates the left side in front view, and the arrow R indicates the right side in front view. Shown respectively.

The soundproof case 2 is covered on six sides in a hermetically sealed manner, and a common base 5 is supported on a bottom wall 2b of the soundproof case 2 via a plurality of anti-vibration rubbers 4, and the common base 5 has a water-cooled horizontal engine 6 and a generator 7. And are placed side by side. A fuel tank 8 is fixed to the upper wall 2c of the soundproof case above the generator 7. Further, a radiator 10 is provided at the left side portion of the front space of the horizontal engine 6 at substantially the same height as the engine 6.

First, the water-cooled horizontal engine 6 will be described.

This is configured as a single cylinder, and a piston 15 is inserted in a cylinder 14 in a cylinder block 13 whose axis is laterally oriented. The cylinder head is on the left side of this cylinder block 13.
17 and the head cover 18 are sequentially fixed. Further, an oil pan 19 is provided so as to project from the lower side of the cylinder block 13, and a gear case 21 is provided so as to project from the front side. The water jacket 29 of the engine 6 is formed by connecting a cylinder jacket 30 for cooling the cylinder 14 and a head jacket 31 for cooling the cylinder head 17 through a plurality of jacket outlet holes 31b (see FIG. 5). An intake port 32 opened on the upper surface side of the cylinder head 17 is connected to an air cleaner 34 via an intake pipe 33, and an exhaust port 35 opened on the rear surface side of the cylinder head 17 is connected to a muffler 37 via an exhaust pipe 36. It

Further, the crankshaft 39 is projected rearward from the central portion of the rear surface side of the cylinder block 13, and the flywheel 40 is fixed to the projecting end. A drive pulley 42 is provided so as to project from the rear surface of the flywheel 40. Further, a starter motor 47 is fixedly installed on the rear upper part of the cylinder block 13 and is connected to a battery (not shown).

The input shaft 48 of the generator 7 is arranged in parallel with the crankshaft 39 of the engine 6, and the input pulley 49 is fixed to the projecting end of the input shaft 48. A drive belt 50 is stretched between the input pulley 49 and the drive pulley 42.

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

The radiator 10 is of a forced draft type, and has a radiator fan 53 provided on the rear surface side thereof. On the other hand, in the water jacket 29, the jacket inlet 31a of the head jacket 31 is opened on the front side of the cylinder head 17, and the jacket cover of the cylinder jacket 30 is provided.
55 is provided with a jacket outlet 30a. The jacket outlet 30a and the hot water inlet 10a of the radiator 10 are connected by a hot water pipe 56, and the jacket inlet 31a and the cold water outlet 1 of the radiator 10 are connected.
0b is communicated with the cold water pipe 57.

Also, as shown mainly in FIG. 1, the jacket inlet 31
A water pump 60 is interposed between a and the cold water pipe 57, and this is the engine 6 that is projected forward from the gear case 21.
Is connected to the rotation axis A of That is, the water pump 60
A pump input pulley 61 is connected as a pump input wheel. On the other hand, the rotary shaft A has a driven gear 62 fixed at its rear end.
・ Crankshaft 39 via gear transmission in gear case 21
A pump transmission pulley 63 is fixed to the front end of the rotary shaft A as a pump transmission wheel. A drive belt 64 is stretched between the pump transmission pulley 63 and the pump input pulley 61 as a winding transmission band.

The pump case 68 of the water pump 60 is attached to the front side of the cylinder head 17, and its pump discharge port 60b communicates with the jacket inlet 31a in the front-rear direction and the pump suction port 60a communicates with the cold water pipe 57. . Pump case 68
A pump shaft 70 is supported by the pump shaft 70 so as to project forward, and an impeller 71 is fixed to the rear end of the pump shaft 70. Further, the pump input pulley 61 and the radiator fan 53 are fixed to a protruding shaft portion 70a protruding outward of the front side of the pump shaft 70. Then, the radiator 10 is arranged facing the front side of the radiator fan 53.

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

By driving the starter motor 47 with a battery (not shown), the engine 6 is driven and the generator 7 starts power generation. Simultaneously with the operation of the engine 6, the water pump 60 and the radiator fan 53 are driven via the drive belt 64, and the radiator fan 53 blows air to the radiator 10. Then, the cooling water in the water jacket 29 is circulated to the water jacket 29 by the water pump 60 through the hot water pipe 56, the radiator 10 and the cold water pipe 57.

Further, in the above case, the outside air taken in through the air intakes X formed in the right side wall 2a and the right side wall 2d of the soundproof case 2 along with the operation of the radiator fan 53 cools the hot water by the radiator 10. Then, it is heated and discharged to the outside of the soundproof case 2 from the air outlet Y formed on the left side portion of the front wall 2a.

FIG. 6 is a plan view of a water-cooled horizontal engine 6 showing another embodiment, and a configuration different from the above embodiments will be described. In this case, the engine 6 has two cylinders, and two sets of the cylinder 14 and the piston 15 are arranged side by side in the front and rear. A pair of intake ports 32, 32 opened on the upper surface side of the cylinder head 17.
Are connected to the intake pipe 33, and a pair of exhaust ports 35, 35 opened on the lower surface side of the cylinder head 17 are connected to the exhaust pipe 36. Then, the water pump 60 is attached to the front side of the cylinder head 17.

FIG. 7 is a plan view of a water-cooled horizontal engine showing still another embodiment. In this case, the water pump 60 is attached to the rear surface side of the cylinder head 17, and the pump input pulley 61 and the radiator fan 53 are provided on the protruding shaft portion 70a protruding to the rear outside of the pump shaft 70. On the other hand, a pump transmission pulley 63 is provided so as to project from the rear surface side of the flywheel 40 fixed to the crankshaft 39, and a drive belt 64 is stretched between the pump transmission pulley 63 and the pump input pulley 61. Then, the radiator 10 is disposed on the rear side of the radiator fan 53.

Note that the transmission device of the water pump 60 may use a sprocket chain instead of using a pulley belt.

[Brief description of drawings]

1 to 7 show an embodiment of the present invention, FIGS. 1 to 5 show one embodiment thereof, FIG. 1 is a cross-sectional plan view of a water-cooled horizontal engine, and FIG. 2 is a soundproof engine power generation. Fig. 3 is a schematic perspective view of the machine, Fig. 3 is a vertical sectional front view, Fig. 4 is a cross-sectional plan view, Fig. 5 is a cross-sectional view taken along the line VV of Fig. 3, and Fig. 6 is water-cooling showing another embodiment. FIG. 7 is a plan view of a horizontal engine, FIG. 7 is a plan view of a water-cooled horizontal engine showing still another embodiment, and FIG. 8 is a longitudinal sectional view of a conventional water-cooled horizontal engine. 6 ... Water-cooled horizontal engine, 10 ... Radiator, 17 ... Cylinder head, 29 ... Water jacket, 31a ... Jacket inlet, 31b ... Head jacket outlet hole, 53 ...
… Radiator fan, 56 …… Hot water pipe, 57 …… Cold water pipe, 60
...... Water pump, 60b …… Discharge port, 61 …… Pump input wheel (pump input pulley), 63 …… Pump transmission wheel (pump transmission pulley), 64 …… Wrapping transmission belt (drive belt), 70
…… Pump shaft, 70a …… Projection shaft, A …… Rotary shaft.

Claims (1)

[Claims] 1. A radiator 10 is disposed at substantially the same height as the water-cooled horizontal engine 6, and the cooling water in a water jacket 29 of the water-cooled horizontal engine 6 is passed through a hot water pipe 56, a radiator 10 and a cold water pipe 57 by a water pump 60. TE WATER JACKET 29
In a water-cooled cooling system for a horizontal engine configured to circulate in the horizontal direction, water pumps 60 are attached to the front and rear sides of the cylinder head 17, and the jacket inlet 31a of the head jacket 31 is opened on the front and rear sides of the cylinder head 17. The outlet port 60b of the water pump 60 is directly communicated with the inlet port 31a in the front-back direction so that the cooling water discharged from the outlet port 60b flows in the front-back direction in the head jacket 31. The head jacket outlet holes 31b are opened at positions above and below the flow of the cooling water to the pump input wheel 61 on the projecting shaft portion 70a projecting toward the front and rear of the pump shaft 70 facing the front and rear of the water pump 60. And the radiator fan 53 are fixed to each other, and the pump transmission wheel 63 and the winding transmission band 64 are attached to the rotary shaft A projecting in the front-rear direction to the outside of the front-rear side of the water-cooled horizontal engine 6. Interlockingly connected to the pump shaft 70 via the micro pump input wheel 61, the radiator around one outer side of the radiator fan 53
A water-cooled cooling system for a horizontal engine, which is characterized by being placed facing 10.