JPH04111544U - Cooling water passage of water-cooled engine - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of this invention is to provide a cooling water passage for a water-cooled engine that improves the cooling efficiency between the cylinder head and cylinder bore. [Structure] In the cooling water passage of the water-cooled engine according to this invention, most of the cooling water fed from the cooling water inlet port into the water jacket of the cylinder block is transferred between the cylinder bores of the plurality of adjacent cylinders. In addition to forming a partition wall for guiding the cooling water, a cooling water guide hole is formed in the gasket for feeding the cooling water guided between the cylinder bores to the water jacket of the cylinder head, thereby directing most of the cooling water to the cylinder bore. The cylinder head is immediately guided into the water jacket of the cylinder head through the gap.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea relates to a water-cooled engine that cools the engine by circulating cooling water. In particular, the present invention relates to a cooling water passage for cooling water circulating within this water-cooled engine.

0002

[Conventional technology]

Generally, in water-cooled engines, the cooling water cooled by the radiator is water. A pump forces the cooling water into the water jacket of the cylinder block, and then the cooling water is for cooling the gasket located on the mating surface of the cylinder block and cylinder head. from inside the water jacket of the cylinder block to the cylinder through the water guide hole. is pumped into the water jacket of the head. Note that the engine uses the cylinders mentioned above. Cooling water circulates within each water jacket formed in the block and cylinder head. While ringing, it is cooled by its endothermic action. In addition, the cylinder head war The cooling water that has passed through the jacket is then pumped to the radiator, and the rest is as described above. Repeat the cooling water circulation cycle.

0003 By the way, the conventional cooling method used in the above-mentioned water-cooled engine, especially the multi-cylinder water-cooled engine, In the water cooling passage, the cooling water pumped into the water jacket of the cylinder block is , the circumference of multiple adjacent cylinders arranged in the cylinder block is almost evenly spaced. After flowing, the water flows through the cooling water guide holes in the gasket, which are formed in multiple locations per cylinder. , the water flows into the cylinder head water jacket almost evenly from the entire circumference of the cylinder. The configuration is as follows.

0004

[Problem that the idea aims to solve]

By the way, according to the cooling water passage of the conventional water-cooled engine mentioned above, the cylinder head The cooling water flowing into the water jacket of the cylinder block is Since the cooling water flows almost evenly around multiple cylinders, its temperature is extremely high. In addition, the cylinder head is cooled by this high-temperature cooling water. The problem was that the cooling efficiency of the head was low.

[0005] In addition, especially in multi-cylinder engines, the part where the cylinders are adjacent, that is, the cylinder bore However, with conventional cooling water passages, cooling water flows through multiple cylinders. Since the flow is almost uniform around the area, the cooling efficiency in this area is also low. There was also a risk that deformation would occur between the cylinder bores.

[0006] In view of the above-mentioned circumstances, this idea was developed to improve the cooling effect between the cylinder head and cylinder bore. The purpose is to provide a cooling water passage for water-cooled engines that improves efficiency. Ru.

[0007]

[Means to solve the problem]

In order to solve the above-mentioned problems, the cooling water passage of this invention has a cylinder block. Cooling water is supplied from the cooling water inlet port into the water jacket of the Forms a bulkhead that guides most of it between the cylinder bores of multiple adjacent cylinders. At the same time, the cooling water guided between the cylinder bores by the gasket is transferred to the cylinder head. A cooling water guide hole is formed to feed the cooling water into the water jacket of the Most of the cooling water is routed between the cylinder bores and immediately sent to the cylinder head water tank. I'm trying to guide you inside the jacket.

[0008]

[Effect]

According to the cooling water passage of the water-cooled engine described above, the water is fed into the cylinder block. The majority of the cooling water is first delivered between the cylinder bores and then into the cylinder head. Since the water is fed into the water jacket, it is fed between the cylinder bores and into the cylinder head. The temperature of the supplied cooling water is lower than in the past, so the cooling water This makes it possible to improve the cooling efficiency between the gap and the cylinder head.

[0009]

【Example】

Hereinafter, one embodiment of a cooling water passage of a water-cooled engine according to this invention will be described in detail.

0010 Figure 2 shows a broken main part of the cylinder block 1 to which the cooling water passage according to the present invention is applied. A cross-sectional top view, especially of a center cam chain type 4-stroke engine mounted on a motorcycle. This shows the left half of a cylinder block used in a four-cylinder engine.

[0011] In this cylinder block 1, there are adjacent first cylinders in the cylinder block 1. A cylinder 2 and a second cylinder 3 are provided. Also, this first and second series The portions where the cylinders 2 and 3 are adjacent to each other, that is, the portions A between the cylinder bores are connected to each other. Moreover, the circumferential surfaces 2a and 3a of the first and second cylinders 2 and 3 and the cylinder block Between the inner circumferential surface 1a of the cylinder 1 and the peripheries 2a and 3a of the first and second cylinders 2 and 3, A water jacket 4 having a substantially figure-eight shape on the upper surface is formed so as to surround the water jacket 4 . On the other hand, there is a wall (not shown) on the exhaust port side 1b of the cylinder block 1 mentioned above. The cooling water (arrow B) pumped by the cylinder pump is transferred to the cylinder block water tank. An inlet port 5 for cooling water to flow into the jacket 4 is formed. . Also, inside the water jacket 4 of the cylinder block, there is a cylinder on the exhaust port side. A pair of partition walls 6, 6 sandwich the water inlet port 5 and the cooling water inlet port 5. It is formed.

0012 This partition wall 6 is located at the bottom of the water jacket 4 as shown in FIG. From the surface 4a, it is formed so as to coincide with the upper surface 1c of the cylinder block 1, and A passage 6a having a small opening area is formed in the portion.

[0013] On the other hand, as shown in FIG. 4, which is a cutaway plan view of the main part of the gasket, A gas disposed on the upper surface 1c (FIG. 2) where the cylinder block 1 and the cylinder block 1 are in close contact with each other. In addition to an insertion hole 10a into which a stud bolt (not shown) is inserted, the socket 10 has a The cooling water fed into the water jacket 4 (Fig. 2) of the cylinder block is A water jacket (not shown) is formed to surround the combustion chamber of the double block. A cooling water guide hole is formed to guide the cooling water into the tank.

[0014] The cooling water guide hole formed in this gasket 10 is the first one having a large opening area. cooling water guide holes 10b, 10c, and 10d, and a second cooling water guide hole whose opening area is extremely small. It is composed of cooling water guide holes 10e and 10f.

[0015] Among these, the first cooling water guide holes 10b, 10c, and 10d having a large opening area are as follows: It is located between the partition walls 6 and 6 (in other words, between the cylinder bores on the exhaust port side A) shown in Figure 2. It is formed at a position facing the area portion 4b of the water jacket 4 to be placed, and The second cooling water guide holes 10e and 10f, which have extremely small opening areas, are connected to the partition wall 6 described above. , 6 other than the area portion 4b of the water jacket 4 It is formed in a position facing 4.

[0016] Therefore, the above-mentioned gasket 10 is arranged on the upper surface 1c of the cylinder block 1. As shown by the dashed line in FIG. 1, the first cooling water guide hole 10b has a large opening area. , 10c, 10d are the area portions 4 of the water jacket 4 located between the partition walls 6, 6. The second cooling water guide hole 10e, 1 is located at the upper part of the cooling water guide hole 10e and has an extremely small opening area. 0f is an area other than the region 4b of the water jacket 4 sandwiched between the partition walls 6, 6 mentioned above. It will be located above the water jacket 4.

[0017] Next, the operation of the above-mentioned cooling water passage will be explained.

[0018] As shown in Figure 1, cooling water is pumped by a water pump (not shown) and is indicated by the arrow As shown in B, a cooling water cooling hole is formed on the exhaust port side 1b of the cylinder block 1. The water is fed into the water jacket 4 of the cylinder block through the inlet port 5. On the other hand, a pair of partition walls 6 in the water jacket 4 of the cylinder block, The area portion 4b surrounded by the space 6 is separated from the other area of the water jacket 4 by a partition wall. 6 and 6, most of the cooling water (arrow B) flows through the exhaust port. The cylinder on the exhaust port side is guided between the cylinder bores A on the This will cool the space between the two bores A. In addition, it is surrounded by a pair of partition walls 6, 6. A small portion of the cooling water guided into the region portion 4b is formed at the upper part of the pair of partition walls 6. The water jacket other than the area portion 4b is cylinders 2 and 3 other than cylinder bore A on the exhaust port side. This will cool the surrounding area.

[0019] On the other hand, the area portion of the water jacket 4 surrounded by the pair of partition walls 6, 6 Most of the cooling water sent to 4b cools the area A between the cylinder bores, which tends to reach high temperatures. After that, the first cooling water guide holes 10b and 10 shown by the dashed line formed in the gasket are opened. c, immediately into the water jacket of the cylinder head (not shown) via 10d. The cylinder head will be cooled.

[0020] Note that the connection between the pair of partition walls 6 and 6 is via a passage 6a formed at the upper part of the pair of partition walls 6. Cooling supplied into the water jacket 4 other than the area portion 4b surrounded by The water flows through a second cooling chamber formed in the gasket 10 and having a small opening area as indicated by a dashed line. The water jacket of the cylinder head (not shown) is passed through the water guide holes 10e and 10f. This will cool the cylinder head.

[0021] Therefore, according to the cooling water passage described above, the cooling water supplied into the cylinder block 1 is Most of the cooling water is first sent to the cylinder bore gap A on the exhaust port side, and then to the gasket. Through the first cooling water guide holes 10b, 10c, and 10d of the cut 10 having a large opening area. Since the water is fed into the water jacket of the cylinder head, the gap between the cylinder bores is The temperature of the cooling water fed into the cylinder head is lower than before, and this causes The cooling efficiency of cooling water between cylinder bores and the cylinder head is significantly improved. becomes.

[0022]

[Effect of the idea]

As explained above, according to the cooling water passage of this invention, there is Most of the delivered cooling water is first delivered between the cylinder bores and then to the cylinders. Since the water is fed into the water jacket of the head, there is a gap between the cylinder bore and the cylinder head. The temperature of the cooling water fed into the card is lower than before, so the cooling water system is The cooling efficiency between the cylinder bores and the cylinder head (especially the combustion chamber) is improved, which reduces the In addition to improving the air filling efficiency and increasing the engine output, To provide a water-cooled engine with excellent durability by preventing cylinder deformation as much as possible. I can do it.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway top view of a cylinder block to which a cooling water passage according to the invention is applied;

FIG. 2 is a partially cutaway top view of a cylinder block to which the cooling water passage according to the invention is applied.

FIG. 3 is a BB sectional view of FIG. 2.

FIG. 4 is a partially cutaway top view of the gasket.

[Explanation of symbols]

1...Cylinder block 2, 3...Cylinder 4... Cylinder block water jacket 5... Cooling water inlet port 6...Bulkhead 10...Gasket 10a...Cooling water guide hole A...a between cylinder bores

Claims (2)

[Scope of utility model registration request] [Claim 1] Cooling water fed from a cooling water inlet port is fed into a water jacket of a cylinder block formed to surround a plurality of adjacent cylinders, and then the water jacket of the cylinder block is formed to surround a plurality of adjacent cylinders. The cooling water fed into the water jacket of the cylinder head, which is formed so as to surround the upper surface of the combustion chamber, is passed through the cooling water guide hole of the gasket provided on the mating surface of the cylinder block and cylinder head. In a cooling water passage of a water-cooled engine, the cooling water is fed into the water jacket of the cylinder block to cool the cylinder block and cylinder head, and the cooling water is fed into the water jacket of the cylinder block from the cooling water inlet port. Cooling water that forms a partition that guides most of the cooling water between the cylinder bores of the plurality of adjacent cylinders, and that supplies the cooling water guided between the cylinder bores by the gasket to the water jacket of the cylinder head. forming a guide hole,
A cooling water passage for a water-cooled engine, characterized in that most of the supplied cooling water is immediately guided into a water jacket of a cylinder head via between the cylinder bores. 2. The cooling water passage for a water-cooled engine according to claim 1, wherein the water-cooled engine is a four-stroke engine.