Piston structure of horizontal engine

Abstract

The present invention discloses a piston structure of a horizontal engine, including a piston body arranged in a horizontal form in a cylinder body of the horizontal engine, the cylinder body including an oil inlet hole, and the piston body including a piston inner cold oil chamber, a piston oil guide groove and a diversion channel. The piston inner cold oil chamber is arranged inside the piston body along the axial direction of the piston body; the piston oil guide groove is arranged on the outer wall of the piston body at the highest point of the horizontal position along the axial direction of the piston body; the diversion channel is arranged between the piston inner cold oil chamber and the piston oil guide groove; wherein when the piston body is at the lower dead center position, the piston oil guide groove is connected to the oil inlet hole. The piston structure of the present invention adopts the form of inputting lubricating oil from top to bottom, and is matched with the design of a special piston oil guide groove and a large-cavity piston inner cold oil chamber, which can well overcome the defects of insufficient oil injected into the inner cage oil channel through the cooling spray hook and insufficient heat taken away, overheating of the piston top and the firepower shore, and piston burning, cracking or oil coking and carbon deposition.

Description

Technical Field

[0001] The invention relates to the field of engines, in particular to a piston structure of a horizontal engine. Background Art

[0002] At present, horizontal engines generally use the same or similar engine pistons as vertical engines. The relative movement of the piston, piston ring and cylinder liner reduces the friction between the piston, piston ring and cylinder liner wall through splash lubrication. Generally, when a horizontal engine is working, the crankshaft rotates to splash oil onto the cylinder wall. During the left and right working process of the piston, the piston ring is lubricated to reduce friction. Since the piston in a horizontal engine moves horizontally or nearly horizontally during operation, and the piston-connecting rod assembly and oil are under the action of gravity, there will be less oil in the upper half of the cylinder wall, while there is sufficient oil in the lower half of the cylinder wall, that is, the upper and lower parts are unevenly lubricated, and there is a risk of eccentric wear on the piston ring.

[0003] Due to structural limitations, conventional engine pistons rely on splashing oil to cool the middle part of the combustion chamber in the piston cavity. Since the splashing oil is limited and the heat taken away is small, the hot piston combustion temperature is very high, which can easily lead to excessive oil temperature and deterioration, short oil change cycle, and even insufficient cooling and piston cracking or melting failure. The internal cooling oil channel can only be arranged on a smaller ring as close to the first piston ring as possible, and can only be used for local cooling of the firepower shore and the first piston ring position. Cooling efficiency is prioritized, which is prone to carbon deposits and coking in the first and second piston ring grooves, leading to piston ring failures such as piston seizure, and a significant increase in engine oil consumption.

[0004] The piston structure of the horizontal engine in the prior art has the following defects: the splash lubrication method has limited effect on reducing the friction of the piston ring and uniform cooling, especially the piston connecting rod assembly has limited ability to control the eccentric wear of the piston ring under the action of gravity. The limited space of the inner cooling oil channel means that the amount of oil injected into the inner cage oil channel through the cooling spray hook is small and the heat is not taken away enough, so the piston top and the firepower shore are overheated, and the risk of piston burning, cracking or oil coking and carbon deposition increases.

[0005] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0006] The object of the present invention is to provide a piston structure for a horizontal engine, which overcomes the above-mentioned defects of the prior art by adopting the form of top-down input of lubricating oil, in combination with a special piston oil guide groove and a large-cavity piston inner cooling oil chamber design.

[0007] To achieve the above-mentioned purpose, the present invention provides a piston structure of a horizontal engine, comprising a piston body arranged in a horizontal form in a cylinder body of the horizontal engine, the cylinder body including an oil inlet hole, and the piston body including a piston inner cold oil chamber, a piston oil guide groove and a diversion channel. The piston inner cold oil chamber is arranged inside the piston body along the axial direction of the piston body; the piston oil guide groove is arranged on the outer wall of the highest point of the horizontal position of the piston body along the axial direction of the piston body; the diversion channel is arranged between the piston inner cold oil chamber and the piston oil guide groove; wherein when the piston body is at the bottom dead center position, the piston oil guide groove is connected to the oil inlet hole.

[0008] In a preferred embodiment, the cooling oil chamber in the piston is a truncated cone-shaped chamber, and the truncated cone-shaped chamber of the cooling oil chamber in the piston is coaxial with the piston body.

[0009] In a preferred embodiment, the piston structure of the horizontal engine also includes an oil guide ring groove arranged on the piston body and located at the end of the piston oil guide groove closest to the combustion chamber, the oil guide ring groove is connected to the piston oil guide groove, and the depth of the oil guide ring groove is greater than the depth of the piston oil guide groove.

[0010] In a preferred embodiment, when the piston body is located at the bottom dead center, the oil guide ring groove is aligned with the oil inlet hole.

[0011] In a preferred embodiment, the piston structure of the horizontal engine further comprises a plurality of piston lubricating oil holes arranged in the oil guide ring groove along the radial direction of the piston body.

[0012] In a preferred embodiment, a plurality of piston lubricating oil holes are connected between the cooling oil chamber in the piston and the outer wall of the piston body.

[0013] In a preferred embodiment, when the piston body is located at the top dead center position, the oil inlet hole is exposed outside the piston body.

[0014] In a preferred embodiment, the piston structure of the horizontal engine further comprises an oil return hole arranged on the inner wall of the cylinder block at the lowest point in the horizontal position.

[0015] In a preferred embodiment, when the piston body is located at the bottom dead center position, the oil return hole is exposed outside the piston body.

[0016] In a preferred embodiment, the piston structure of the horizontal engine further includes overflow holes arranged on both sides of the horizontal position of the cold oil cavity in the piston, and the overflow holes are connected to the rear inner cavity arranged at the rear of the piston body.

[0017] Compared with the prior art, the piston structure of the horizontal engine of the present invention has the following beneficial effects: this solution adopts the form of inputting lubricating oil from top to bottom, and cooperates with the design of a special piston oil guide groove and a large-cavity piston cold oil chamber. When the piston works horizontally, the oil inlet hole transports lubricating oil to the piston cold oil chamber through the piston oil guide groove and the diversion channel. Since the piston oil guide groove is arranged at the top of the horizontal piston structure, and the piston oil guide groove has a certain length, the lubrication demand of the top can be met. Moreover, the lubricating oil in the piston cold oil chamber penetrates into the outer wall of the piston body through a plurality of piston lubricating oil holes arranged in a ring, and finally flows to the oil return hole to take away excess heat, thereby solving the defects of overheating of the piston top and the fire shore, and the increased risk of piston melting, cracking or oil coking and carbon deposition. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a structural schematic diagram of a piston structure of a horizontal engine located at the bottom dead center according to an embodiment of the present invention;

[0019] Figure 2 is a schematic structural diagram of a piston structure of a horizontal engine located at the top dead center according to an embodiment of the present invention;

[0020] Figure 3 yes Figure 1 A schematic cross-sectional view at A-A of FIG.

[0021] Figure 4 is a perspective schematic diagram of a piston body according to an embodiment of the present invention;

[0022] Figure 5 is a three-dimensional schematic diagram of a piston body according to an embodiment of the present invention from another perspective;

[0023] Figure 6 is a left side schematic view of a piston body according to an embodiment of the present invention;

[0024] Figure 7 yes Figure 6 Schematic cross-sectional view at B-B.

[0025] Description of main reference numerals:

[0026] 100-piston body, 200-cylinder body, 1-piston inner cooling oil chamber, 2-piston oil guide groove, 3-piston lubricating oil hole, 4-inner wall, 5-oil inlet hole, 6-oil return hole, 7-piston ring, 8-flow guide channel, 9-oil guide ring groove, 10-overflow hole, 11-rear inner chamber. DETAILED DESCRIPTION

[0027] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.

[0028] Unless explicitly stated otherwise, throughout the specification and claims, the term “comprise” or variations such as “include” or “comprising”, etc., will be understood to include the stated elements or components but not to exclude other elements or components.

[0029] like Figures 1 to 3 As shown, a piston structure of a horizontal engine according to a preferred embodiment of the present invention includes a piston body 100 arranged in a horizontal form in the cylinder body of the horizontal engine, the cylinder body 200 includes an oil inlet hole 5, and the piston body 100 includes a piston inner cold oil chamber 1, a piston oil guide groove 2 and a guide channel 8. The piston inner cold oil chamber 1 is arranged inside the piston body 100 along the axial direction of the piston body 100. The piston oil guide groove 2 is arranged on the outer wall of the highest point of the horizontal position of the piston body 100 along the axial direction of the piston body 100. The guide channel 8 is arranged between the piston inner cold oil chamber 1 and the piston oil guide groove 2. When the piston body 100 is at the bottom dead center position, the piston oil guide groove 2 is connected to the oil inlet hole 5.

[0030] like Figures 5 to 7 As shown, in some embodiments, the cooling oil chamber 1 in the piston is a truncated cone-shaped cavity, and the truncated cone-shaped cavity of the cooling oil chamber 1 in the piston is coaxial with the piston body 100 .

[0031] See also Figures 5 to 7 In some embodiments, the piston structure of the horizontal engine further includes an oil guide ring groove 9 arranged on the piston body 100 and located at the end of the piston oil guide groove 2 closest to the combustion chamber, the oil guide ring groove 9 is connected to the piston oil guide groove 2, and the depth of the oil guide ring groove 9 is greater than the depth of the piston oil guide groove 2. When the piston body 100 is at the bottom dead center position, the oil guide ring groove 9 is aligned with the oil inlet hole 5.

[0032] See also Figures 1 to 7 In some embodiments, the piston structure of the horizontal engine further includes a plurality of piston lubricating oil holes 3 arranged in the oil guide ring groove 9 along the radial ring of the piston body 100. The plurality of piston lubricating oil holes 3 are connected between the cold oil cavity 1 in the piston and the outer wall of the piston body 100.

[0033] In some embodiments, when the piston body 100 is located at the top dead center, the oil inlet hole 5 is exposed outside the piston body 100 .

[0034] In some embodiments, the piston structure of the horizontal engine further includes an oil return hole 6 disposed on the inner wall 4 of the cylinder body 200 at the lowest point in the horizontal position. When the piston body 100 is at the bottom dead center position, the oil return hole 6 is exposed outside the piston body 100.

[0035] In some embodiments, the piston structure of the horizontal engine further includes overflow holes 10 disposed on both sides of the horizontal position of the cooling oil chamber 1 in the piston, and the overflow holes 10 are connected to the rear inner chamber 11 disposed at the rear of the piston body 100 .

[0036] See also Figure 1 and Figure 2 In some embodiments, the lubrication method of the piston structure of the horizontal engine of the present invention is as follows:

[0037] When the piston body 100 moves from the bottom dead center position to the top dead center position, the oil inlet hole 5 provided on the cylinder body 200 is firstly opposite to the oil guide ring groove 9, and the lubricating oil at this time mainly replenishes the lubricating oil to the piston body 100 along the oil guide ring groove 9, and at the same time, the lubricating oil also replenishes the lubricating oil to the piston inner cold oil chamber 1 from the piston lubricating oil holes 3 of the multiple piston lubricating oil holes 3 arranged at the bottom of the oil guide ring groove 9, which are located above the horizontal center line of the piston body 100. When the piston body 100 continues to move from the bottom dead center position to the top dead center position and crosses the oil guide ring groove 9, the lubricating oil at this time mainly enters the piston oil guide groove 2 to replenish the lubricating oil to the top area of ​​the piston body 100, and at the same time, a part of the lubricating oil enters the piston inner cold oil chamber 1 through the diversion channel 8, and another part of the lubricating oil replenishes the lubricating oil to the piston body 100 along the oil guide ring groove 9. The lubricating oil in the cold oil chamber 1 in the piston is mainly replenished to the outer wall of the piston body 100 from the piston lubricating oil holes 3 and the oil guide ring groove 9 located below the horizontal center line of the piston body 100. When the piston body 100 moves to the top dead center position, the oil inlet hole 5 is no longer blocked by the piston body 100, and the lubricating oil in the oil inlet hole 5 is directly replenished into the cylinder hole, and finally flows back to the oil return hole 6. When the piston body 100 returns from the top dead center position to the bottom dead center position, the replenishment of the lubricating oil is similar. When the liquid level of the lubricating oil in the cold oil chamber 1 in the piston is higher than the horizontal center line of the piston body 100, in addition to replenishing the lubricating oil to the outer wall of the piston body 100 from the multiple piston lubricating oil holes 3 located below the horizontal center line of the piston body 100, some of the lubricating oil will flow from the overflow hole 10 through the rear inner cavity 11 flow channel cylinder barrel, and finally flow back to the oil return hole 6.

[0038] In summary, the piston structure of the horizontal engine of the present invention has the following advantages: this solution adopts the form of inputting lubricating oil from top to bottom, and cooperates with the design of a special piston oil guide groove and a large-cavity piston cold oil chamber. When the piston works horizontally, the oil inlet hole transports lubricating oil to the piston cold oil chamber through the piston oil guide groove and the diversion channel. Since the piston oil guide groove is arranged at the top of the horizontal piston structure, and the piston oil guide groove has a certain length, the lubrication demand of the top can be met. Moreover, the lubricating oil in the piston cold oil chamber penetrates into the outer wall of the piston body through a plurality of piston lubricating oil holes arranged in a ring, and finally flows to the oil return hole to take away excess heat, thereby solving the defects of overheating of the piston top and the fire shore, and the increased risk of piston melting, cracking or oil coking and carbon deposition.

[0039] The foregoing description of specific exemplary embodiments of the present invention is for the purpose of illustration and demonstration. These descriptions are not intended to limit the present invention to the precise form disclosed, and it is clear that many changes and variations can be made based on the above teachings. The purpose of selecting and describing the exemplary embodiments is to explain the specific principles of the present invention and its practical application, so that those skilled in the art can realize and utilize various different exemplary embodiments of the present invention and various different selections and changes. The scope of the present invention is intended to be limited by the claims and their equivalents.

Claims

1. A piston structure of a horizontal engine, characterized in that: include: A piston body is horizontally arranged in the cylinder body of the horizontal engine, the cylinder body includes an oil inlet hole, and the piston body includes: A piston inner cooling oil chamber, which is arranged inside the piston body along the axial direction of the piston body; A piston oil guide groove, which is arranged on the outer wall of the piston body at the highest point of the horizontal position along the axial direction of the piston body; A flow guide channel, which is arranged between the cold oil cavity in the piston and the piston oil guide groove; When the piston body is at the bottom dead center, the piston oil guide groove is connected to the oil inlet hole; an oil guide ring groove, which is arranged on the piston body and is located at the end of the piston oil guide groove closest to the combustion chamber, the oil guide ring groove is connected to the piston oil guide groove, the depth of the oil guide ring groove is greater than the depth of the piston oil guide groove, and when the piston body is at the bottom dead center position, the oil guide ring groove is aligned with the oil inlet hole; and A plurality of piston lubricating oil holes are arranged in the oil guide ring groove along the radial ring of the piston body, and the plurality of piston lubricating oil holes are connected between the cold oil cavity in the piston and the outer wall of the piston body; The lubrication method of the piston structure is as follows: When the piston body moves from the bottom dead center position to the top dead center position, the oil inlet hole arranged on the cylinder body is firstly opposite to the oil guide ring groove, and the lubricating oil at this time is replenished to the piston body along the oil guide ring groove for one circle, and at the same time, the lubricating oil is also replenished to the cold oil cavity in the piston from the piston lubricating oil holes of the part located above the horizontal center line of the piston body among the multiple piston lubricating oil holes arranged at the bottom of the oil guide ring groove; When the piston body continues to move from the bottom dead center position to the top dead center position and passes over the oil guide ring groove, the lubricating oil at this time mainly enters the piston oil guide groove to replenish the lubricating oil to the top area of ​​the piston body, and at the same time, part of the lubricating oil enters the cold oil chamber in the piston through the guide channel, and another part of the lubricating oil is replenished along the oil guide ring groove to the periphery of the piston body, and the lubricating oil in the cold oil chamber in the piston is mainly replenished to the outer wall of the piston body from the piston lubricating oil hole and the oil guide ring groove located below the horizontal midline of the piston body; and When the piston body moves to the top dead center position, the oil inlet hole is no longer blocked by the piston body, and the lubricating oil in the oil inlet hole is directly added to the cylinder hole.

2. The piston structure of a horizontal engine according to claim 1, characterized in that: The cold oil chamber in the piston is a truncated cone-shaped chamber, and the truncated cone-shaped chamber of the cold oil chamber in the piston is coaxial with the piston body.

3. The piston structure of a horizontal engine according to claim 1, characterized in that: When the piston body is located at the top dead center, the oil inlet hole is exposed outside the piston body.

4. The piston structure of a horizontal engine according to claim 1, characterized in that: The cylinder body further comprises an oil return hole, which is arranged on the inner wall of the cylinder body at the lowest point in the horizontal position.

5. The piston structure of a horizontal engine according to claim 4, characterized in that: When the piston body is located at the bottom dead center, the oil return hole is exposed outside the piston body.

6. The piston structure of a horizontal engine according to claim 2, characterized in that: It also includes overflow holes, which are arranged on both sides of the horizontal position of the cold oil cavity in the piston, and the overflow holes are connected with the rear inner cavity arranged at the rear part of the piston body.

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