JPH0518240A - Air liquid cooling device for air liquid-cooled type multi cylinder engine - Google Patents

Abstract

PURPOSE:To radiate the heat of cooling liquid in a jacket from a cylinder block by forming cooling air passages below the inner bottom parts of an intercylinder liquid-cooled jacket and a cylinder flank liquid-cooled jacket. CONSTITUTION:An intercylinder cooling air passage 10 is formed below the inner bottom part of an intercylinder liquid-cooled jacket 5 and a cylinder flank cooling air passage 11 is formed below the inner bottom part of a cylinder flank liquid-cooled jacket 8. In this constitution, the heat of cooling liquid in both liquid-cooled jackets 5 and 8 is radiated through the bottom walls of both liquid-cooled jackets 5 and 8 to cooling air flowing through both cooling air passages 10 and 11, resulting in reduction of the size of a radiator 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air-liquid cooling device for an air-liquid cooling type multi-cylinder engine.

[0002]

2. Description of the Related Art As a conventional technology of an air-liquid cooling device for an air-liquid cooling type multi-cylinder engine, there is one shown in FIG. This is provided with a cooling fan 104 on the front side of a cylinder block 103 in which a plurality of cylinders 101, 102 are arranged in front and rear, and each cylinder 101, 102 is provided in a wall of the cylinder block 103.
An inter-cylinder liquid cooling jacket 105 is provided between the cylinders 101 and 102, and a cylinder lateral liquid cooling jacket 108 is provided between the cylinders 101 and 102 and the push rod chambers 106 and 107 on the lateral sides of the cylinders 101 and 102. 1
08 and the radiator are configured to circulate between each other.

According to this structure, the periphery of the cylinder block 103 is cooled by air cooling, and the cylinder block 10 is cooled.
The cylinders 101 and 102 in 3 are liquid-cooled with the cooling liquid passing through the inter-cylinder liquid cooling jacket 105, and the cylinder lateral side liquid cooling jacket 108 is provided between the cylinders 101 and 102 and the push rod chambers 106 and 107. Liquid cooling can be performed with the cooling liquid passing through.

In this prior art, both liquid cooling jackets 10 are used.
There is no means for radiating the heat of the cooling liquid in the cylinder block 103 from the cylinder block 103, and the bottom of the inner bottom of each of the inter-cylinder liquid cooling jacket 105 and the cylinder side liquid cooling jacket 108 is the meat of the cylinder block 103. It is a pool.

[0005]

The above-mentioned prior art has the following problems. Since there is no means for dissipating the heat of the cooling liquid in both liquid cooling jackets 105 and 108 from the cylinder block 103, a large radiator outside the cylinder block 103 must dissipate a large amount of heat, which results in a large engine. Turn into.

Below the inner bottom portions of the inter-cylinder liquid cooling jacket 105 and the cylinder side liquid cooling jacket 108,
Since it is a reservoir of the cylinder block 103,
The engine was heavy. In addition, pin holes are easily formed in the cylinder block 103 during casting.

The object of the present invention is to allow the heat of the cooling liquid in both jackets to be dissipated from the cylinder block.

[0008]

According to the present invention, as illustrated in FIG. 1A, a cooling fan 4 is provided on a cylinder block 3 having a plurality of cylinders 1 and 2 arranged in front and rear, and In the meat wall, an inter-cylinder liquid cooling jacket 5 is provided between the cylinders 1 and 2, and a cylinder lateral side liquid cooling jacket 8 is provided between the cylinders 1 and 2 and the push rod chambers 6 and 7 on the side thereof. And an air-liquid cooling device for an air-liquid cooled multi-cylinder engine, in which the cooling liquid is circulated between the liquid cooling jackets 5 and 8 and the radiator 9 as illustrated in FIG. , Is characterized by the following.

That is, as illustrated in FIG. 1 (B),
An inter-cylinder cooling air passage 10 is formed below the inner bottom portion of the inter-cylinder liquid cooling jacket 5, and a cylinder lateral cooling air passage 11 is formed below the inner bottom portion of the cylinder lateral liquid cooling jacket 8. , Is characterized.

[0010]

OPERATION AND EFFECTS OF THE INVENTION Inter-cylinder liquid cooling jacket 5
Since the inter-cylinder cooling air passage 10 is formed on the lower side of the inner bottom portion of the cylinder side and the cylinder side cooling air passage 11 is formed on the lower side of the inner bottom portion of the cylinder side liquid cooling jacket 8, both liquid cooling jackets 5 The heat of the cooling liquid inside 8 is radiated to the cooling air flowing through both cooling air passages 10 and 11 via the bottom walls of both liquid cooling jackets 5 and 8. Therefore, the radiator 9 can be downsized, and the engine can be downsized.

An inter-cylinder cooling air passage 10 is formed below the inner bottom of the inter-cylinder liquid cooling jacket 5, and
Since the cylinder lateral cooling air passage 11 is formed below the inner bottom portion of the cylinder lateral liquid cooling jacket 8, it is located below the inner bottom portion of each of the inter-cylinder liquid cooling jacket 5 and the cylinder lateral liquid cooling jacket 8. It is possible to reduce the weight of the engine by removing the buildup of the cylinder block 3. Further, it is possible to prevent pinholes from being formed in the cylinder block 3 during casting.

[0012]

Embodiments of the present invention will be described with reference to the drawings.
1A and 1B are views for explaining a cylinder block of an air-liquid cooling type multi-cylinder engine according to an embodiment of the present invention. FIG. 1A is a plan view and FIG. 1B is a cross-sectional plan view. 2 is shown in FIG.
It is the II-II sectional view taken on the line of (A).

In FIG. 1A, reference numeral 3 indicates a cylinder block of a two-cylinder engine, which has the following structure. The cylinder block 3 is made of aluminum die cast, and two cylinders 1 and 2 are arranged adjacent to each other in the front-rear direction, and push-rod chambers 6 and 7 for each cylinder are provided on the lateral side of each cylinder 1 and 2. A cylinder liner 12 is fitted inside each of the cylinders 1 and 2. A plurality of horizontal cooling fins 13 are projected around the cylinder block 3 in a vertically arranged manner. As shown in FIG. 1B, a baffle plate 16 is provided along the right wall 14 and the rear wall 15 of the cylinder block 3, and a cooling air passage 17 around the block is formed inside the baffle plate 16. The right wall 14 and the rear wall 15 of the cylinder block 3 face each other.

Further, as shown in FIG. 1A, a cooling fan 4 is provided on the front side of the cylinder block 3, and the cooling fan 4 is covered with a fan case 18. Inside the fan case 18, the passage start end of the block-circumferential-side cooling air passage 17 shown in FIG. The cooling air generated by the cooling fan 4 passes through the block peripheral side cooling air passage 17 as shown by the arrow 19, and in this process, cools the right wall 14 and the rear wall 15 of the cylinder block 3.

Further, as shown in FIG. 1 (A), the cylinder block 3 has both cylinders 1 and 2 in the wall thereof.
An inter-cylinder liquid cooling jacket 5 is provided between them. Also,
Both cylinders 1 and 2 and push rod chambers 6 and 7 beside them
A series of long cylinder side liquid cooling jackets 8 is provided between the front and the rear. As shown in FIG. 2, the cylinder side liquid cooling jacket 8 has a cooling liquid inflow hole 20 formed in the rear wall 15 of the cylinder block 3, a discharge port 23 of a relief valve 22 of a lubricating oil supply passage 21, and a lubricating oil pump 24. Are communicated with the oil pan 25 in order. Both liquid cooling jackets 5 and 8 have a communication hole 26 formed over both inner bottom portions thereof.
I am communicating with. The communication hole 26 is drilled from the right wall 14 of the cylinder block 3 while avoiding the head bolt 27, and its opening is sealed with a plug 28. Both liquid cooling jackets 5 and 8 are connected to the inside of the oil pan 25 through the head jacket 29 of the cylinder head, the radiator 9, and the cooling liquid return passage 30 in this order.

In this engine, the lubricating oil in the oil pan 25 is pumped by the lubricating oil pump 24 so that the lubricating oil is supplied to the lubricating oil supply passage 21.
Is fed under pressure to the sliding portion 31 such as the bearing portion of the crankshaft. Further, the lubricating oil overflowing from the discharge port 23 of the relief valve 22 flows into the cylinder side liquid cooling jacket 8 as a cooling liquid as shown by an arrow 32, and from there, also through the communication hole 26 to the inter-cylinder liquid cooling jacket 5. Inflow. The cooling liquid that has flowed into both liquid cooling jackets 5 and 8 circulates and returns to the oil pan 25 through the head jacket 29, the radiator 9, and the cooling liquid return passage 30 in that order.

In this engine, the heat of the cooling liquid in the inter-cylinder liquid cooling jacket 5 and the cylinder side liquid cooling jacket 8 can be radiated from the cylinder block 3.
The following innovations have been made. As shown in FIG. 1B, an inter-cylinder cooling air passage 10 is formed below the inner bottom portion of the inter-cylinder liquid cooling jacket 5. A cylinder lateral cooling air passage 11 is formed below the inner bottom of the cylinder lateral liquid cooling jacket 8. The cylinder side cooling air passage 11 is formed only between the front cylinder 1 and the front push rod chamber 6.

The passage starting end of the inter-cylinder cooling air passage 10 is communicated with the cooling air passage 17 around the block. The passage starting end of the cylinder side cooling air passage 11 is communicated with the inside of the fan case 18. The inter-cylinder cooling air passage 10 and the cylinder side cooling air passage 11 are joined at substantially the center of the cylinder block 3, and an outlet passage 34 is provided from this joining point 33 to pass between the push rod chambers 6 and 7.
The end of the passage of the outlet passage 34 is connected to the cylinder block 3
It is opened in the left wall 35. As shown in FIG. 2, the outlet-side passage 34 is vertically elongated to the mid-height position of the cylinder lateral-side liquid cooling jacket 8.

Further, inter-cylinder cooling fins 37 are provided downward from the bottom wall 36 of the inter-cylinder liquid cooling jacket 5 along the passage direction of the inter-cylinder cooling air passage 10. Also,
Outlet cooling fins 39 are provided laterally from the left wall 38 of the inter-cylinder liquid cooling jacket 5 along the passage direction of the outlet passage 34. Further, as shown in FIG. 1B, the cylinder lateral cooling fins 40 are provided along the passage direction of the cylinder lateral cooling air passage 11. The cylinder side cooling fins 40 are provided downward from the bottom wall of the cylinder side liquid cooling jacket 8.

In this engine, as shown in FIG. 1 (B), a part of the cooling air generated by the cooling fan 4 is indicated by the arrow 4
1, the cooling air passage 17 from the block surrounding side flows into the cooling air passage 10 between the cylinders, and the other part flows from the fan case 18 directly into the cooling air passage 11 beside the cylinder as indicated by an arrow 42. These merge at the merge point 33 and flow out from the cylinder block 3 via the outlet side passage 34. At this time, the heat of the cooling liquid in the inter-cylinder liquid cooling jacket 5 and in the cylinder side liquid cooling jacket 8 is changed by the cooling fins 37.3.
The heat is radiated to the cooling air through 9/40.

[Brief description of drawings]

FIG. 1 is a diagram illustrating a cylinder block of an air-liquid cooling multi-cylinder engine according to an embodiment of the present invention, and FIG.
Is a plan view, and FIG. 1B is a cross-sectional plan view. FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a plan view of a cylinder block of an air-liquid cooling multi-cylinder engine according to a conventional technique.

[Explanation of symbols]

1, 2 ... Cylinder, 3 ... Cylinder block, 4 ... Cooling fan, 5 ... Cylinder liquid cooling jacket, 6.7 ... Push rod chamber, 8 ... Cylinder side liquid cooling jacket, 9 ... Radiator, 10 ... Cylinder Cooling air passage, 11 ... Cooling air passage on the side of the cylinder.

Claims (1)

What is claimed is: 1. A cooling fan (4) is provided in a cylinder block (3) having a plurality of cylinders (1) and (2) arranged in front and rear, and a cooling wall (4) is provided in the wall of the cylinder block (3). And the above cylinders
An inter-cylinder liquid cooling jacket (5) is provided between (1) and (2), and a cylinder is provided between the cylinders (1) and (2) and the push rod chambers (6) and (7) on the side thereof. A liquid cooling jacket (8) is provided on the side, and the cooling liquid is supplied to both liquid cooling jackets (5).
In an air-liquid cooling device for an air-liquid cooling multi-cylinder engine, which is configured to circulate between the (8) and the radiator (9), below the inner bottom part of the inter-cylinder liquid cooling jacket (5). An inter-cylinder cooling air passage (10) is formed, and a cylinder lateral cooling air passage (11) is formed below the inner bottom portion of the cylinder lateral liquid cooling jacket (8). Air-cooling system for cold multi-cylinder engines.