Cross flow scavenging outboard engine piston

Abstract

The utility model belongs to the technical field of engine pistons, and discloses a transverse flow scavenging outboard engine piston which comprises a piston body and an air cylinder, and the piston body comprises a piston skirt part, a piston head part and a piston convex top. Through cooperation of a piston convex top, a piston pin, a first flow guide angle, a second flow guide angle and other structures, the device has the effects of being high in scavenging efficiency and reducing oil consumption, the piston body moves to the exhaust hole, waste gas in the air cylinder is exhausted from the exhaust hole through the first flow guide angle, then the piston body continues to move downwards, and the effect of reducing oil consumption is achieved. Through the design of the second flow guide angle on the convex top of the piston, waste gas in the air cylinder is guided out through the second flow guide angle, and when the piston body crosses a lower dead center to move upwards, mixed gas is guided through the convex top of the piston, so that the waste gas in the air cylinder is removed more thoroughly, and the effect of few waste gas residues is achieved; and the performance of the engine is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to engine piston technical field, specifically a kind of cross-flow scavenging outboard engine piston. BACKGROUND

[0002] Outboard engine generally refers to the external engine on the ship, for driving boat forward, and piston is a key component inside engine, engine piston withstands high temperature and high pressure environment in work, so that the requirement of material strength and wear resistance is higher, and the design and manufacturing quality of piston directly affect the performance and reliability of engine.

[0003] When two-stroke outboard engine is used, due to its simple structure, light weight and high specific power, it will face the problems of large scavenging loss, high fuel consumption and so on, and most of the pistons on the market are generally flat or spherical crown shape, and the scavenging port of two-stroke outboard engine is opposite to the exhaust port, which may cause the exhaust gas to remain in the combustion chamber, thereby increasing the fuel consumption and reducing the engine performance, therefore, a kind of cross-flow scavenging outboard engine piston is proposed to solve the problems in the background art. SUMMARY

[0004] To solve the problems in the background art, the utility model provides a kind of cross-flow scavenging outboard engine piston, which has the advantages of improving scavenging efficiency, reducing fuel consumption and improving engine performance.

[0005] To achieve the above purpose, the utility model provides the following technical scheme: a kind of cross-flow scavenging outboard engine piston, including piston body and cylinder, the piston body includes piston skirt, piston head and piston convex top, the inside of the piston body is provided with piston pin, the both ends of the piston pin are provided with fixed ring, the surface of the piston head is provided with a plurality of piston ring grooves, the inside of the cylinder is provided with crankshaft, the outer surface of the crankshaft is hinged with connecting rod.

[0006] Preferably, the two sides of the top of the piston head are respectively provided with first guide angle and second guide angle, and the first guide angle and the second guide angle are both semicircular arc.

[0007] Preferably, the piston body moves in the inside of cylinder, and the roundness radian of the second guide angle is greater than that of the first guide angle.

[0008] Preferably, the surface of the piston convex top is provided with up mark, and the top end of the piston convex top is convex.

[0009] Preferably, the fixed ring is used to fix the piston pin in the inside of the piston body, and the top end of the connecting rod is hinged with the piston pin.

[0010] Preferably, the piston body is made of aluminum alloy material, and the inside of the cylinder is provided with an exhaust hole and a scavenging channel.

[0011] Compared with the prior art, the utility model has the beneficial effects as follows:

[0012] The utility model discloses a piston convex top, piston pin, first guide vane angle and second guide vane angle cooperate between the structure, make the device have the high scavenging efficiency, thereby reduce the oil consumption's function, through the piston body moves to the exhaust hole place, thereby the exhaust gas in the cylinder is discharged from the exhaust hole place through the first guide vane angle, then the piston body continues to move down, make the compressed mixture gas enter the cylinder through the scavenging channel and the scavenging hole, at this time, through the design of the second guide vane angle on the piston convex top, make the exhaust gas in the cylinder be guided out through the second guide vane angle, when the piston body passes through the bottom dead center and goes up, at this time, the exhaust gas in the cylinder is removed more thoroughly through the effect of the guide of the piston convex top, thereby reach the effect that the exhaust gas residual is little, and then improve the performance of the engine. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is the whole structure schematic diagram of the utility model;

[0014] Figure 2 It is the right section structure plan view of the utility model;

[0015] Figure 3 It is the side section structure plan view of the utility model;

[0016] Figure 4 It is the top schematic diagram of the utility model;

[0017] Figure 5 It is the plan schematic diagram of the piston body and the cylinder cooperation of the utility model.

[0018] In the drawing: 1, piston body;101, piston skirt;102, piston head;103, piston convex top;2, piston pin;3, fixed ring;4, piston ring groove;5, first guide vane angle;6, second guide vane angle;7, connecting rod;8, crankshaft;9, cylinder;10, exhaust hole;11, scavenging channel. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0020] As Figures 1 to 5As shown, the utility model provides a kind of cross-flow scavenging outboard engine piston, including piston body 1 and cylinder 9, piston body 1 includes piston skirt 101, piston head 102 and piston crown 103, the inside of piston body 1 is provided with piston pin 2, both ends of piston pin 2 are provided with fixed ring 3, the surface of piston head 102 is provided with several piston ring grooves 4, the inside of cylinder 9 is provided with crankshaft 8, the outer surface of crankshaft 8 is hinged with connecting rod 7.

[0021] With the above scheme: by piston body 1 moves to exhaust hole 10, so that the exhaust gas in the inside of cylinder 9 is discharged from exhaust hole 10 by first guide angle 5, then piston body 1 continues to move down, so that the compressed mixture gas enters cylinder 9 by scavenging channel 11 and scavenging hole, at this time, by the design of second guide angle 6 on piston crown 103, the exhaust gas in cylinder 9 is guided out by second guide angle 6, when piston body 1 goes over bottom dead center and goes up, at this time, the exhaust gas in cylinder 9 is removed more thoroughly by the effect of guide flow at piston crown 103, so as to achieve the effect of less exhaust gas residue, and further improve the performance of engine.

[0022] As shown in Figures 1 to 5 Piston head 102 top two sides are provided with first guide angle 5 and second guide angle 6 respectively, first guide angle 5 and second guide angle 6 are semicircular arc, piston body 1 moves in the inside of cylinder 9, the circular arc radian of second guide angle 6 is greater than that of first guide angle 5.

[0023] With the above scheme: first guide angle 5 and second guide angle 6 are semicircular arc, which can guide the airflow in combustion chamber more smoothly, so as to promote the full mixing and combustion of mixture gas, and further improve the combustion efficiency and power output, at the same time, compared with sharp angle, semicircular arc can effectively reduce the turbulence phenomenon of airflow, so as to reduce the resistance of airflow movement, and further make piston body 1 move more smoothly in cylinder 9, so as to reduce energy loss.

[0024] As shown in Figures 1 to 5 The surface of piston crown 103 is provided with up mark, the top end of piston crown 103 is convex, fixed ring 3 is used for fixing piston pin 2 in the inside of piston body 1, the top end of connecting rod 7 is hinged with piston pin 2, piston body 1 is made of aluminum alloy material, the inside of cylinder 9 is provided with exhaust hole 10 and scavenging channel 11.

[0025] Adopting the above scheme: the surface of the piston crown 103 is provided with an UP mark, which can effectively ensure the correct direction of the piston body 1 during installation, because the structure at the piston crown 103 is asymmetric, and if the installation direction of the piston body 1 is incorrect, it may affect the performance, compression ratio of the engine, and even cause damage to the engine; the piston body 1 is made of aluminum alloy material, which can quickly conduct the heat absorbed by the piston crown 103 out, thereby helping to maintain the temperature stability of the piston body 1 in a high-temperature working environment, thereby avoiding damage caused by overheating, and also conducive to the overall heat dissipation of the engine.

[0026] The working principle and use process of the utility model: the piston body 1 moves downward to the bottom dead center inside the cylinder 9, thereby compressing the mixed gas inside the cylinder 9, when the piston body 1 moves to the exhaust hole 10, at this time, the exhaust gas inside the cylinder 9 is discharged from the exhaust hole 10 through the first flow guide angle 5, then the piston body 1 continues to move downward, so that the compressed mixed gas enters the cylinder 9 through the scavenging passage 11 and the scavenging hole, the mixed gas entering the cylinder 9 is driven by the flow guide effect of the second flow guide angle 6 at the piston crown 103, when the piston body 1 goes over the bottom dead center and moves upward, at this time, the mixed gas is guided by the flow guide effect at the piston crown 103, so that the exhaust gas in the cylinder 9 is cleaned more thoroughly, thereby achieving the effects of high scavenging efficiency and less exhaust gas residue, and further improving the performance of the engine.

[0027] It should be noted that in this text, relational terms such as first and second are used only to distinguish one entity or operation from another, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment.

[0028] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A crossflow scavenged outboard engine piston comprising a piston body (1) and a cylinder (9), characterized in that: The piston body (1) comprises a piston skirt (101), a piston head (102) and a piston crown (103), the inside of the piston body (1) is provided with a piston pin (2), both ends of the piston pin (2) are provided with a fixed ring (3), the surface of the piston head (102) is provided with a plurality of piston ring grooves (4), the inside of the cylinder (9) is provided with a crankshaft (8), the outer surface of the crankshaft (8) is hinged with a connecting rod (7), both sides of the top of the piston head (102) are respectively provided with a first flow angle (5) and a second flow angle (6), the first flow angle (5) and the second flow angle (6) are both semicircular arc.

2. The crossflow scavenged outboard engine piston of claim 1, wherein: The piston body (1) moves in the inside of the cylinder (9), the roundness of the second flow angle (6) is greater than that of the first flow angle (5).

3. The crossflow-scavenged outboard engine piston of claim 1, wherein: The surface of the piston crown (103) is provided with an up mark, and the top of the piston crown (103) is convex.

4. The crossflow-scavenged outboard engine piston of claim 1, wherein: The fixed ring (3) is used for fixing the piston pin (2) in the inside of the piston body (1), and the top of the connecting rod (7) is hinged with the piston pin (2).

5. The crossflow-scavenged outboard engine piston of claim 1, wherein: The piston body (1) is made of aluminum alloy material, and the inside of the cylinder (9) is provided with an exhaust hole (10) and a scavenging channel (11).

Images