CN211343151U - Cylinder body of two-stroke internal combustion engine - Google Patents

Abstract

The utility model discloses a two-stroke internal-combustion engine cylinder body, it includes body and side cap, side cap fixed mounting is on the body, be equipped with suction side scavenging route, exhaust side scavenging route, combustion chamber on the body, suction side scavenging route, exhaust side scavenging route distribute around the combustion chamber, the output of suction side scavenging route and the output of exhaust side scavenging route all directly communicate with the combustion chamber, the side cap covers on suction side scavenging route, exhaust side scavenging route place region, is equipped with the scavenging route arch of shaping on the side cap, the protruding embedding of shaping is at this internal, be equipped with air guide recess I and air guide recess II on the scavenging route arch of shaping. The cylinder body of the two-stroke internal combustion engine is provided with a structure which can be constructed on the surface and is related to the air outlet direction on the side cover by separating the part related to the air outlet direction from the cylinder body, so that the structural design and implementation production difficulty of the air outlet direction of the scavenging passage are greatly reduced, and the cylinder body is easy to realize.

Description

Cylinder body of two-stroke internal combustion engine

Technical Field

The utility model relates to a two-stroke internal combustion engine cylinder body.

Background

The double-scavenging cylinder bodies of the prior two-stroke internal combustion engine are mainly divided into two types: the cylinder body of the open type scavenging passage and the cylinder body of the closed type scavenging passage. The cylinder body of the open type scavenging passage is the most widely used cylinder body of the two-stroke internal combustion engine on the prior two-stroke internal combustion engine due to low mould manufacturing and product cost and simple processing technology. But the scavenging speed is slow, the temperature is high, the performance of the whole machine is poor, and the problems cannot be solved on an open scavenging passage cylinder body. The cylinder body with closed scavenging passage is one advanced cylinder body for two-stroke internal combustion engine and consists of mainly one cylinder body and two side covers. The air passage is arranged on the body, and the two side covers are used for sealing, so that a complete scavenging passage is combined. The scavenging passage is positioned in the cylinder body, and only two openings are exposed on the cylinder body. The main effect of side cap lies in sealed, therefore the cylinder body adopts the die-casting mode to produce, and its inside scavenging passage sets up the position that must be constructed at the psammitolite, just so can make the structure of scavenging passage can't avoid because of the psammitolite fixed requirement is the opening that technological factor produced promptly, that is to say, the scavenging passage has three opening on the cylinder body when the side cap is not installed to the cylinder body. The sealing function of the side cover aims at the opening formed on the cylinder body due to process factors, and the opening is not positioned at two ends of the scavenging passage but at the middle position of the scavenging passage. The structure of the two ends of the scavenging passage, particularly the structure of the output end of the scavenging passage, namely the end of the scavenging passage communicated with the combustion chamber, is not affected by the side cover, and the structure of the output end of the scavenging passage is completely determined by the cylinder body.

The output end structure of the scavenging passage is greatly helpful for improving scavenging effect and optimizing engine power, especially in the aspect of designing a specific air outlet angle. The prior art design of this angle has drawbacks. The cylinder body is made of die-cast aluminum alloy, and due to the limitation of process factors, the scavenging passage structure which can be manufactured by the cylinder body manufactured in a die-casting mode is simpler, and even the scavenging passage structure which can be realized by the cylinder body manufactured by a complex die cannot be greatly improved; therefore, the scavenging passage with a specific air outlet angle manufactured in the prior art has the advantages of very small structure range, high manufacturing cost and long production period. If the sand core is forcibly used for serving the production process of the scavenging passage, the structure of the scavenging passage is necessarily limited by the complex structure of the scavenging passage, so that the mold cannot be demoulded during manufacturing, and the production cannot be realized. In summary, in the prior art, the structure of the output end of the closed scavenging passage on the cylinder body is limited to the structural range of the simple scavenging passage, and the output end of the closed scavenging passage with a complex structure cannot be produced and implemented.

Disclosure of Invention

The to-be-solved technical problem of the utility model is how to improve the scavenging route output structure and can produce the implementation, obtain a two-stroke internal-combustion engine cylinder body from this.

In order to solve the technical problem, the utility model adopts the following technical scheme: the cylinder body of the two-stroke internal combustion engine comprises a body and a side cover, wherein the side cover is fixedly arranged on the body, the body is provided with a suction side scavenging passage, an exhaust side scavenging passage and a combustion chamber, the intake side scavenging passage and the exhaust side scavenging passage are distributed around the combustion chamber, the output end of the intake side scavenging passage and the output end of the exhaust side scavenging passage are both directly communicated with the combustion chamber, the side cover covers the area where the suction side scavenging passage and the exhaust side scavenging passage are located, the side cover is provided with a scavenging passage forming bulge, the forming bulge is embedded in the body, the scavenging passage forming bulge is provided with an air guide groove I and an air guide groove II, the output end of the air intake side scavenging passage and the output end of the air exhaust side scavenging passage are both positioned between the scavenging passage forming bulge and the body, the air guide groove I is located in the output end of the suction side scavenging passage, and the air guide groove II is located in the output end of the exhaust side scavenging passage.

The function of side cover in this technical scheme not only plays sealed effect, and the most important is the structure of the output that constructs the scavenging way. The surface contour of the air guide groove I corresponds to the output end contour of the suction side scavenging passage, and the surface contour of the air guide groove II corresponds to the output end contour of the exhaust side scavenging passage, so that the structure of the air guide groove I is a key factor for determining the structure of the output end of the suction side scavenging passage, and the air guide groove II is a key factor for determining the structure of the output end of the exhaust side scavenging passage. The structure of the two air guide grooves can determine the air outlet direction of the output end of the scavenging passage. It is worth noting that in the prior art, the air outlet direction of the output end of the scavenging passage is determined on the body of the cylinder body, not on the side cover; the protruding shape of forming on this technical scheme side cover can decide the direction of giving vent to anger of the output of scavenging way. The side cap can independently produce for the cylinder body, and the side cap design surface goes out the structure of air guide recess I and air guide recess II and implements production, compares the body internal design of cylinder body about giving vent to anger the structure of direction and implements production, and the degree of difficulty reduces by a wide margin, implementability improves greatly. The air guide groove I and the air guide groove II are designed to be separated from the body of the cylinder body, so that the design of the air outlet direction or the air outlet angle of the output end of the scavenging passage becomes flexible, and the air guide groove I and the air guide groove II can respond to various factors to be adjusted randomly.

In order to ensure the structural integrity of the combustion chamber, the forming bulge in the technical scheme can be isolated and cannot be used for forming the combustion chamber, so that the design requirement of a dynamic component on a fit clearance is avoided, the design requirement, the processing and manufacturing difficulty and the assembly process requirement of the component are reduced, and the two-stroke internal combustion engine cylinder further has the advantages of simplicity in design, manufacture and assembly. It is specific, be equipped with spacing portion I, spacing portion II, spacing portion III on the body, one side of spacing portion I, one side of spacing portion II, one side of spacing portion III all are the cambered surface towards combustion chamber and surface, the protruding swing joint that takes shape of the opposite side of spacing portion I, the opposite side of spacing portion II, the opposite side of spacing portion III and scavenging route, the output of intake side scavenging route still is located between spacing portion I, spacing portion II, the output of exhaust side scavenging route still is located between spacing portion II, spacing portion III.

In order to improve the scavenging speed, the opening width of the air guide groove I is larger than that of the air guide groove II.

The utility model adopts the above technical scheme: the cylinder body of the two-stroke internal combustion engine is provided with a structure which can be constructed on the surface and is related to the air outlet direction on the side cover by separating the part related to the air outlet direction from the cylinder body, so that the structural design and implementation production difficulty of the air outlet direction of the scavenging passage are greatly reduced, and the cylinder body is easy to realize.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and embodiments.

FIG. 1 is a schematic structural diagram I of a two-stroke internal combustion engine cylinder body according to the present invention;

FIG. 2 is a schematic structural diagram II of a two-stroke internal combustion engine cylinder body according to the present invention;

fig. 3 is a schematic structural diagram iii of a two-stroke internal combustion engine cylinder body according to the present invention;

FIG. 4 is a schematic diagram IV of a two-stroke internal combustion engine cylinder of the present invention;

fig. 5 is a schematic structural diagram v of a two-stroke internal combustion engine cylinder body according to the present invention;

fig. 6 is a schematic structural view of a side cover of a cylinder body of a two-stroke internal combustion engine according to the present invention.

Detailed Description

As shown in fig. 1, the two-stroke engine block includes a body 1 and a side cover 2. As shown in fig. 2 and 3, a suction-side scavenging passage 6, an exhaust-side scavenging passage 7, and a combustion chamber 8 are provided in the main body 1, one suction-side scavenging passage 6 and one exhaust-side scavenging passage 7 are provided in a group on one side around the combustion chamber 8, and one suction-side scavenging passage 6 and one exhaust-side scavenging passage 7 are also provided on the other side of the combustion chamber 8. The end of the intake side scavenging passage 6 directly communicated with the combustion chamber 8 is an output end, and the end of the exhaust side scavenging passage 7 directly communicated with the combustion chamber 8 is an output end, so that the output end of the intake side scavenging passage 6 and the output end of the exhaust side scavenging passage 7 are both directly communicated with the combustion chamber 8. Two process openings are arranged outside the body 1, and the two groups of scavenging air passages can be communicated with the outside through the process openings. As shown in fig. 6, a scavenging passage forming protrusion 3 is arranged on the side cover 2, an air guide groove i 4 and an air guide groove ii 5 which are separated from each other are arranged on the scavenging passage forming protrusion 3, and the opening width of the air guide groove i 4 is larger than that of the air guide groove ii 5. The side cover 2 is fixed on the body 1 through bolts, after installation, as shown in fig. 4 and 5, the output end of the suction side scavenging passage 6 and the output end of the exhaust side scavenging passage 7 are both positioned between the scavenging passage forming protrusion 3 and the body 1, the air guide groove I4 is positioned in the output end of the suction side scavenging passage 6, and the air guide groove II 5 is positioned in the output end of the exhaust side scavenging passage 7, so that the side cover 2 covers the area where the suction side scavenging passage 6 and the exhaust side scavenging passage 7 are positioned. As shown in fig. 3, the body 1 is provided therein with a stopper i 9, a stopper ii 10, and a stopper iii 11. One side of the limiting part I9, one side of the limiting part II 10 and one side of the limiting part III 11 face the combustion chamber 8, and the surfaces of the limiting parts are cambered surfaces; the other side of the limiting part I9, the other side of the limiting part II 10 and the other side of the limiting part III 11 are movably connected with the scavenging passage forming bulge 3; as shown in fig. 3, after the side cover 2 is mounted, the output end of the suction-side scavenging passage 6 is positioned between the limiting portion i 9 and the limiting portion ii 10, and the output end of the exhaust-side scavenging passage 7 is positioned between the limiting portion ii 10 and the limiting portion iii 11. By changing the structures of the air guide groove I4 and the air guide groove II 5, the air outlet direction of the output end of the air suction side scavenging passage 6 and the air outlet direction of the output end of the air exhaust side scavenging passage 7 can be changed. The air guide grooves I4 and the air guide grooves II 5 are both surface structures of the forming bulges 3, the structure of the forming bulges 3 is very convenient to change, and the side cover 2 is also very convenient to produce, so that the air outlet direction of the output end of the air suction side scavenging passage 6 and the air outlet direction of the output end of the air exhaust side scavenging passage 7 of the two-stroke internal combustion engine cylinder body can be flexibly changed in a large range.

Claims (3)

1. The two-stroke internal combustion engine cylinder body comprises a body (1) and a side cover (2), wherein the side cover (2) is fixedly installed on the body (1), a suction side scavenging passage (6), an exhaust side scavenging passage (7) and a combustion chamber (8) are arranged on the body (1), the suction side scavenging passage (6) and the exhaust side scavenging passage (7) are distributed around the combustion chamber (8), the output end of the suction side scavenging passage (6) and the output end of the exhaust side scavenging passage (7) are directly communicated with the combustion chamber (8), and the side cover (2) covers the area where the suction side scavenging passage (6) and the exhaust side scavenging passage (7) are located, and is characterized in that: be equipped with on side cap (2) and sweep the protruding (3) of air flue formation, the protruding (3) embedding of formation is in body (1), be equipped with air guide groove I (4) and air guide groove II (5) on the protruding (3) of air flue formation, the output of air flue (6) is swept to the suction side and the output of air exhaust side air flue (7) all are located between air flue formation arch (3) and body (1), air guide groove I (4) are located the output of air flue (6) is swept to the suction side, air guide groove II (5) are located the output of air exhaust side air flue (7).

2. The two-stroke internal combustion engine block of claim 1, wherein: be equipped with spacing portion I (9), spacing portion II (10), spacing portion III (11) on body (1), one side of one side, one side of spacing portion II (10), one side of spacing portion III (11) of spacing portion I (9) all is the cambered surface towards combustion chamber (8) and surface, the opposite side of opposite side, the opposite side of spacing portion II (10), the opposite side and the scavenging route of spacing portion III (11) of spacing portion I (9) take shape protruding (3) swing joint, the output of intake side scavenging route (6) still is located between spacing portion I (9), spacing portion II (10), the output of exhaust side scavenging route (7) still is located between spacing portion II (10), spacing portion III (11).

3. The two-stroke internal combustion engine block of claim 1, wherein: the opening width of the air guide groove I (4) is larger than that of the air guide groove II (5).

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