TW201908593A - Cylinder structure of internal combustion engine characterized in that the cylinder main body is formed by die casting and the scavenging ports are directly formed on cylinder main body - Google Patents

Abstract

A cylinder structure of an internal combustion engine includes a cylinder main body and two lateral covers. The cylinder main body is formed by die casting and has a combustion chamber formed through being surrounded by an outer circumference wall and a cylinder head, an air inlet port and an air outlet port disposed at two sides of the combustion chamber and two scavenging units staggeringly arranged with the air inlet port and the air outlet port. The scavenging unit has a first scavenging port and a second scavenging port. The air outlet port is adjacent to the combustion chamber and the height thereof is higher than that of the air inlet port. The height of the first scavenging port and that of the second scavenging port are defined between the air inlet port and the air outlet port. The lateral covers are served to respectively cover outer sides of the scavenging units so as to seal the aforesaid scavenging ports, and a scavenging passageway is formed between the lateral covers and the outer circumference wall. When a scavenging operation is processed, waste air is introduced from the first scavenging port, and the waste air passes through the scavenging passageway then flows through the second scavenging port towards the air outlet port so as to be discharged to the exterior.

Description

 Cylinder structure of internal combustion engine  

The present invention relates to a cylinder, and more particularly to a cylinder structure for manufacturing a simple and fast internal combustion engine.

As shown in FIG. 7, a conventional two-stroke internal combustion engine includes a cylinder 1, a crankcase 2 disposed at the bottom of the cylinder 1, a piston 3 disposed inside the cylinder 1, and a crankshaft disposed in the crankcase 2. 201. A connecting rod 4 connected between the crankshaft 201 and the piston 3, and a spark plug 5 disposed at the top end of the cylinder 1, the cylinder 1 having an internal combustion chamber 6 and located on the side wall of the cylinder 1 An air inlet 7, an exhaust port 8 and a scavenging port 9. When the internal combustion engine is in the air exchange phase, it will enter the scavenging phase, at which time the crankshaft 201 drives the connecting rod 4 to displace the piston 3 downward to open the scavenging port 9, at which time the exhaust gas is pushed in from the scavenging port 9 and via The exhaust port 8 is discharged outward to complete the scavenging operation.

Since the internal combustion engine must have a scavenging operation to eliminate the exhaust gas remaining in the crankcase, the cylinder is in the production, and the arrangement of the intake port, the exhaust port, and the scavenging port is the most difficult, and, in the past, the cylinder The scavenging port is designed to meet the scavenging efficiency, and is designed to be a structure with a complicated distribution inside the body, which makes it impossible to directly cut and shape the processing tool. Therefore, the conventional cylinder is casted (or gravity casting). In order to obtain a casting having the above structure, it is also necessary to cooperate with a special manufacturing method of precision dewaxing to form a scavenging structure integrally formed with the cylinder body, but this method is only suitable for small batch production and also for cylinders. Slow production, low output, no economic benefits, and relatively high manufacturing costs, will be passed on to consumers, which is not conducive to maintaining product competitiveness.

The cylinder structure of the internal combustion engine of the present invention is that a hollow air scavenging port is directly formed on the cylinder body during die casting, and a side cover is closed on the outer side of the cylinder body to cover the scavenging port, thereby forming a braided sweep. Air flow path to achieve the advantages of rapid manufacturing and increased production.

The cylinder structure of the internal combustion engine of the present invention is made by die-casting, is easy to manufacture and low in cost, and overcomes the problem that the conventional cylinder body is dewaxed to cause slow process speed and high cost.

In addition, in the cylinder structure of the internal combustion engine of the present invention, the cylinder head can be made by being integrally formed in combination with the cylinder body. In addition, it can also be combined and molded separately, and has the advantage of being easy and quick to manufacture.

Therefore, the cylinder structure of an internal combustion engine proposed by the present invention comprises a cylinder body and two side covers. The cylinder body is die-cast and has a combustion chamber formed by an outer ring wall and a cylinder head, an air inlet and an exhaust port on both sides of the combustion chamber, and a side of the combustion chamber And a second scavenging unit arranged in parallel with the air inlet and the exhaust port, the scavenging unit has a first scavenging port and a second scavenging port, the exhaust port abutting the combustion chamber and the height is higher than the The air inlet, the first scavenging port and the second scavenging port height position of the scavenging unit are between the air inlet and the exhaust port. The side cover covers the outside of the scavenging unit to close the first scavenging port and the second scavenging port, and forms a scavenging air passage between the outer ring wall and the exhaust gas during the scavenging operation of the internal combustion engine. The first scavenging port is brought in, and the scavenging air passage is further discharged outward from the second scavenging port toward the exhaust port.

According to the above-described cylinder structure of the internal combustion engine of the present invention, the scavenging unit further has an open groove and a rib laterally connected to the middle portion of the open groove, and the first portion between the two sides of the rib and the open groove form the first The scavenging port and the second scavenging port have a thickness smaller than a groove depth of the open groove, and an inner side of the rib is flush with an inner peripheral wall of the combustion chamber.

According to the above-described cylinder structure of the internal combustion engine, the first scavenging port is adjacent to the bottom of the cylinder body, and the height is not lower than the air inlet, and the second scavenging port is adjacent to the combustion chamber and has a high height. At the air inlet, below the exhaust port.

According to the above-described cylinder structure of the internal combustion engine, each of the side covers has a first engaging portion disposed on the cover edge, and the cylinder body further has a second engaging portion disposed on the outer side of the scavenging units. The first engaging portion of the side cover corresponds to the second engaging portion, and is adhered by a gas-tight material to couple the side cover to the cylinder body.

The cylinder structure of the above internal combustion engine according to the present invention, wherein the airtight material is an anaerobic curing acrylate.

According to the above-described cylinder structure of the internal combustion engine, the first engaging portion of the side cover is a convex portion, and the second engaging portion of the cylinder body is a concave portion.

According to the above-described cylinder structure of the internal combustion engine, the cylinder body further has a plurality of fins disposed on an outer peripheral wall.

According to the above-described cylinder structure of the internal combustion engine, the cylinder body is made of aluminum die-casting.

According to the above-described cylinder structure of the internal combustion engine, the aforementioned side cover is made of aluminum die-casting.

According to the above-described cylinder structure of the internal combustion engine, the cylinder head of the cylinder body is further provided with a spark plug inlet and a gas valve inlet.

According to the above-described cylinder structure of the internal combustion engine, the cylinder head of the cylinder body is integrally formed on the top of the cylinder body.

According to the above description, compared with the cylinder of the existing internal combustion engine, it is necessary to cooperate with the dewaxing manufacturing method in order to manufacture the scavenging port on the cylinder body, thereby causing problems such as low manufacturing yield; the cylinder structure of the internal combustion engine of the present invention is formed by die casting. The method directly forms a hollow scavenging port on the cylinder body, and then uses the side cover to engage the outer side of the scavenging port to form a scavenging air passage in the cylinder body, so that the internal combustion engine can perform the scavenging operation and overcome the problem. In the past, problems such as difficulty in manufacturing the cylinder body. Therefore, the cylinder structure of the present internal combustion engine not only has the advantages of being easy and fast to manufacture, but also the output can be relatively improved, so that it has the advantages and effects of reducing the manufacturing cost.

100‧‧‧ cylinder

10‧‧‧Cylinder body

11‧‧‧ outer ring wall

111‧‧‧ combustion chamber

112‧‧‧ inner wall

113‧‧‧ peripheral wall

12‧‧‧air inlet

13‧‧‧Exhaust port

14‧‧‧Second Embedding

15‧‧‧ Heat sink

20‧‧‧ cylinder head

21‧‧‧Mars plug entrance

22‧‧‧ throttle valve inlet

30‧‧‧ side cover

31‧‧‧First Embedding

40‧‧‧ scavenging unit

41‧‧‧First scavenging port

42‧‧‧Second scavenging port

43‧‧‧Open slot

44‧‧‧ ribs

441‧‧‧ inside

45‧‧‧sweeping airway

50‧‧‧Piston

60‧‧‧ crankcase

61‧‧‧ crankshaft

62‧‧‧ linkage

200‧‧ ‧ cylinder

W1‧‧‧ thickness

W2‧‧‧ groove depth

Fig. 1 is a perspective view showing the appearance of a preferred embodiment of a cylinder structure of an internal combustion engine.

Fig. 2 is a perspective view showing the cylinder structure of the internal combustion engine.

Fig. 3 is a side view showing the cylinder structure of the internal combustion engine.

Fig. 4 is a cross-sectional view showing the cylinder structure of the internal combustion engine.

Fig. 5 is another cross-sectional view showing the cylinder structure of the internal combustion engine.

Fig. 6 is a sectional view showing the combination of the cylinder head and the cylinder body in a two-stage configuration.

Figure 7 is a schematic view showing the combination of the existing two-stroke internal combustion engine.

In a preferred embodiment of the cylinder structure of the present internal combustion engine, the cylinder 100 is internally provided with a piston 50. The bottom of the cylinder 100 is connected to a crankcase 60. The crankcase 60 is provided with a crankshaft 61 and a crankshaft 61 connected thereto. A connecting rod 62 between the pistons 50 drives the piston 50 to perform an up and down displacement operation, as shown in FIG.

As shown in FIGS. 1 to 4, the cylinder 100 includes a cylinder body 10, a cylinder head 20, and two side covers 30. The cylinder body 10 is made of aluminum die-casting, and has a combustion chamber 111 formed by an outer ring wall 11 and the cylinder head 20 (see FIG. 5), and one side of the combustion chamber 111. An air inlet 12 and an exhaust port 13 , and two scavenging units 40 located on the side of the combustion chamber 111 and interleaved with the air inlet 12 and the exhaust port 13 , the scavenging unit 40 has a first sweep a gas port 41 and a second scavenging port 42 adjacent to the combustion chamber 111 and having a height higher than the gas inlet port 12, and the heights of the first scavenging port 41 and the second scavenging port 42 of the scavenging unit 40 The position is between the air inlet 12 and the exhaust port 13. In addition, the scavenging unit 40 further has an open slot 43 and a rib 44 laterally connected to the middle of the open slot 43. The first scavenging port 41 is formed between the two sides of the rib 44 and the open slot 43. The second scavenging port 42, the thickness W1 of the rib 44 is smaller than the groove depth W2 of the open groove 43, and the inner side 441 of the rib 44 is flush with an inner peripheral wall 112 of the combustion chamber 111 (as shown in Figs. 2 and 5). Shown).

Referring to the first and fifth figures, the side cover 30 is provided with a convex ridge, and is respectively closed on the outer side of each of the scavenging units 40 to close the first scavenging port 41 and the second scavenging port 42 and A sweeping airflow path 45 is formed between the outer ring walls 11 and an inverted U-shaped shape. When the internal combustion engine performs the scavenging operation, the exhaust gas is taken in from the first scavenging port 41, and the second scavenging port is further passed through the scavenging air passage 43. 42 is discharged outward toward the exhaust port 13. In this embodiment, each of the side covers 30 has a first engaging portion 31 disposed on the cover edge, and the cylinder body 10 further has a second engaging portion 14 disposed on the outer side of the scavenging unit 40. The first engaging portion 31 of the side cover 30 corresponds to the second engaging portion 14 and is adhered by a gas-tight material 32 to bond the side cover 30 to the cylinder body 10. The airtight material 32 in this case is an anaerobic cured acrylate. In Fig. 5, the first engaging portion 31 of the side cover 30 is a convex portion, and the second engaging portion 14 of the cylinder body 10 is a concave portion.

It is worth mentioning that, as shown in the first and fifth figures, the cylinder body 10 further has a plurality of fins 15 disposed on an outer peripheral wall 113 for both heat dissipation.

Further, the first scavenging port 41 of the scavenging unit 40 is adjacent to the bottom of the cylinder body 10, and the height is not lower than the air inlet 12, and the second scavenging port 42 is adjacent to the combustion chamber 111, and The height is higher than the intake port 12 and lower than the exhaust port 13.

Next, the cylinder head 20 is further provided with a spark plug inlet 21 and a gas valve inlet 22 for mounting a spark plug and a gas valve (not shown). In the first and fourth figures, the cylinder head 20 is integrally molded on the top of the cylinder body 10 by die casting, thereby achieving a simple and quick manufacturing effect. In addition, as shown in FIG. 6, the cylinder body 10 and the cylinder head 20 of the cylinder 200 are respectively made by aluminum die-casting, and the cylinder head 20 is coupled to the top of the cylinder body 10 by a gas-tight material. Therefore, it is easy to manufacture and is fast to manufacture.

As described above, the cylinder of the existing internal combustion engine must be combined with the dewaxing manufacturing method to manufacture the scavenging port on the cylinder body, resulting in a problem of low manufacturing yield and the like; the cylinder structure of the internal combustion engine of the present invention is formed by die casting. A hollow scavenging port (ie, the first scavenging port 41 and the second scavenging port 42) is directly formed on the cylinder body 10, and then the side cover 30 is fitted to the outside of the scavenging port to make the cylinder body 10 The outer side surface is sealed, and the inner air groove of the side cover 30 cooperates with the scavenging port to form a scavenging air passage 45 in the cylinder body 10, so that the internal combustion engine can perform the scavenging operation. Therefore, the scavenging airflow of the present invention 45 does not need to be formed by dewaxing, and overcomes the problems of difficult manufacturing of the cylinder body in the past.

Therefore, in the cylinder structure of the present internal combustion engine, the cylinder body 10 and the side cover 30 are respectively manufactured by die-casting, and the side cover 30 is fixed by the gluing method, which is not only easy and fast to manufacture, but also has a relatively high output, so Reduce the advantages and benefits of manufacturing costs. Secondly, since each of the side covers 30 is formed with a convex bulge, a structure of the ridge and a first wide scavenging air passage 45 are naturally formed between the first scavenging port 41 and the second scavenging port 42 to increase the flow path space. In turn, it provides smoothness in scavenging operations and improves scavenging efficiency.

In addition, since the operation process of the internal combustion engine is not the focus of the case, it is not explained in detail in this creation. The operation mode is the same as that of the previous internal combustion engine, and will not be described again.

The above description is only a preferred embodiment of the present invention, and the scope of the present invention cannot be limited by this, that is, the simple equivalent changes and modifications made by the content of the patent application and the content of the implementation of the present invention are all It should remain within the scope of this creation patent.

Claims (11)

 A cylinder structure of an internal combustion engine includes: a cylinder body formed by die casting, having a combustion chamber formed by an outer ring wall and a cylinder head, an air inlet on one side of the combustion chamber, and an exhaust gas a second scavenging unit located at a side of the combustion chamber and interleaved with the air inlet and the exhaust port, the scavenging unit has a first scavenging port and a second scavenging port, the exhaust port abutting The height of the first scavenging port and the second scavenging port of the scavenging unit are between the air inlet and the air outlet; and the two side covers are respectively covered Cooperating with the outside of the scavenging unit to close the first scavenging port and the second scavenging port, and forming a scavenging air passage between the outer ring wall and the exhaust air from the first scavenging port when the internal combustion engine performs a scavenging operation Bringing in, passing through the sweeping air passage and discharging outward from the second scavenging port toward the exhaust port.    The cylinder structure of the internal combustion engine of claim 1, wherein the scavenging unit further has an open slot and a rib laterally connected to the middle of the open slot, and between the two sides of the rib and the open slot The first scavenging port and the second scavenging port are formed, the rib portion has a thickness smaller than a groove depth of the open groove, and an inner side of the rib portion is flush with an inner peripheral wall of the combustion chamber.    The cylinder structure of the internal combustion engine of claim 1, wherein the first scavenging port is adjacent to the bottom of the cylinder body and the height is not lower than the air inlet, and the second scavenging port is adjacent to the combustion chamber. And the height is higher than the air inlet and lower than the air outlet.    The cylinder structure of the internal combustion engine of claim 1, wherein each of the side covers has a first engaging portion disposed on the cover edge, and the cylinder body further has two outer portions disposed on the outer side of the scavenging unit. The second engaging portion corresponds to the second engaging portion of the side cover and is adhered by a gas-tight material to couple the side cover to the cylinder body.    The cylinder structure of an internal combustion engine according to claim 4, wherein the airtight material is an anaerobic curing acrylate.    The cylinder structure of the internal combustion engine of claim 4, wherein the first engaging portion of the side cover is a convex portion, and the second engaging portion of the cylinder body is a concave portion.    The cylinder structure of the internal combustion engine of claim 1, wherein the cylinder body further has a plurality of fins disposed on an outer peripheral wall.    The cylinder structure of an internal combustion engine according to claim 1, wherein the cylinder body is made of aluminum die-casting.    The cylinder structure of an internal combustion engine according to claim 1, wherein the side cover is made of aluminum die-casting.    The cylinder structure of the internal combustion engine of claim 1, wherein a cylinder plug of the cylinder body is further provided with a spark plug inlet and a gas valve inlet.    The cylinder structure of the internal combustion engine of claim 1, wherein the cylinder head of the cylinder body is integrally coupled to the top of the cylinder body.