An engine piston cooling and lubrication structure

Abstract

The present invention relates to an engine piston cooling and lubrication structure, comprising a piston head cooling and oscillating oil chamber, an internal piston oil passage, an engine body oil inlet passage, a piston sidewall transverse oil groove, and a piston sidewall longitudinal oil groove. No additional components are required; only the longitudinal oil groove, transverse oil groove, and internal oil passage are machined on the piston sidewall. Cooling and lubricating oil can then communicate with the engine body oil passage and the machined piston oil passage to reach the lubricating oil cylinder wall, the piston head, and the connecting rod bushing, achieving cooling and lubrication. Furthermore, the cooling and lubricating oil quantity and pressure can be distributed according to different requirements by designing oil passages with different cross-sectional areas. The cooling and lubricating oil can accurately and fully reach the target locations, resulting in excellent cooling and lubrication effects. The structure can be used as a solution to piston erosion and cylinder scuffing caused by factors such as high piston temperature and in-cylinder detonation in reciprocating engines.

Description

Technical Field

[0001] The invention belongs to the technical field of internal combustion engines, and in particular relates to an engine piston cooling and lubrication structure. Background Art

[0002] During the operation of a reciprocating piston engine, factors such as high temperatures within the combustion chamber and in-cylinder detonation can easily cause piston erosion and cylinder scuffing. This necessitates adequate cooling of the piston head and the cylinder wall near the piston rings. Furthermore, lubrication of the cylinder wall and the piston connecting rod bushing is necessary to prevent scuffing and seizure, ensuring proper engine operation. Traditional reciprocating piston engines use cooling nozzles, but the piston head cooling oscillation oil chamber has low target and capture rates. The cooling nozzles are easily crushed, and insufficient oil supply can lead to piston erosion and other problems. Summary of the Invention

[0003] The present invention provides an engine piston cooling and lubrication structure, and the technical problems to be solved are: solving the problems of piston ablation and cylinder scuffing caused by factors such as high engine temperature and in-cylinder detonation, solving the problems of low target rate and capture rate of the cooling oscillation oil chamber of the piston head of a traditional piston reciprocating engine; and solving the problems of cooling nozzles being easily flattened and insufficient oil supply causing piston ablation.

[0004] In order to solve the above technical problems, the present invention provides an engine piston cooling and lubricating structure, which is characterized in that: a piston oil ring is arranged on the outer wall of the piston, a transverse oil groove (4) and a longitudinal oil groove (5) are provided on the side wall of the piston, and the transverse oil groove (4) and the longitudinal oil groove (5) are arranged alternately below the piston oil ring; a piston head cooling and oscillating oil cavity (1) is provided in the piston, a piston internal oil passage (2) is provided on the piston at a position corresponding to the longitudinal oil groove (5), the piston internal oil passage (2) is communicated with the piston head cooling and oscillating oil cavity (1), and a body oil inlet passage (3) is provided on the side wall of the cylinder and the body; the body oil inlet passage (3) is always connected with the longitudinal oil groove (5) downstream of the piston oil ring during the reciprocating motion of the piston, and then the lubricating oil is coated on the cylinder wall through the transverse oil groove (4), and enters the piston head cooling and oscillating oil cavity (1) and the inner side of the piston through the piston internal oil passage (2).

[0005] Beneficial effects: During the reciprocating motion of the piston, the oil inlet channel of the engine body of the present invention is always connected to the longitudinal oil groove on the side wall downstream of the piston oil ring. The lubricating oil is then applied to the cylinder wall through the transverse oil groove of the piston and enters the piston head cooling oscillation oil chamber and the inner side of the piston through the internal oil channel of the piston, completing the cooling of the piston head and lubrication of the connecting rod bushing and other parts. The present invention does not require additional parts. Only the longitudinal oil groove, transverse oil groove and internal oil channel are machined on the side wall of the piston. The cooling lubricating oil can be connected to the machined oil channel of the piston through the engine body oil channel and reach the lubricating oil cylinder wall, the piston head and the connecting rod bushing and other parts to achieve the purpose of cooling and lubrication. Moreover, the amount and pressure of the cooling lubricating oil can be distributed according to different requirements by designing oil channels of different cross-sectional areas. Considering that the structure of the present invention is similar to the basic structure of the piston assembly of a traditional piston reciprocating engine, it involves fewer modified parts and the modification cost is low. The cooling lubricating oil can accurately and fully reach the target part, thereby achieving an excellent cooling and lubricating effect. Therefore, it can be used as a solution to the piston ablation and cylinder scuffing caused by factors such as high temperature of the piston and detonation in the cylinder of a piston reciprocating engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a structural schematic diagram of the present invention,

[0007] Figure 2 It is a schematic diagram of the piston structure;

[0008] Figure 3 It is a schematic diagram of the cooling and lubricating flow channel of the present invention.

[0009] In the figure: 1-piston head cooling and oscillation oil chamber, 2-piston internal oil channel, 3-engine body oil inlet channel, 4-piston side wall transverse oil groove, 5-piston side wall longitudinal oil groove, 6-cylinder and engine body, 7-piston, 8-piston oil ring. DETAILED DESCRIPTION

[0010] In order to make the purpose, content and advantages of the present invention more clear, the specific embodiments of the present invention are further described in detail below.

[0011] The present invention proposes an engine piston cooling and lubrication structure, which is characterized in that: a piston oil ring is arranged on the outer wall of the piston, a transverse oil groove (4) and a longitudinal oil groove (5) are provided on the side wall of the piston, and the transverse oil groove (4) and the longitudinal oil groove (5) are arranged alternately below the piston oil ring; a piston head cooling and oscillating oil cavity (1) is provided in the piston, a piston internal oil passage (2) is provided at a position corresponding to the longitudinal oil groove (5) on the piston, the piston internal oil passage (2) is communicated with the piston head cooling and oscillating oil cavity (1), and a body oil inlet passage (3) is provided on the side walls of the cylinder and the body;

[0012] The body oil inlet channel (3) is always connected to the longitudinal oil groove (5) downstream of the piston oil ring during the reciprocating motion of the piston, and then the lubricating oil is coated on the cylinder wall through the transverse oil groove (4), and enters the piston head cooling and oscillating oil chamber (1) and the inner side of the piston through the internal oil channel (2) of the piston to complete the cooling of the piston head and the lubrication of the connecting rod small end bushing and other parts.

[0013] The present invention only requires that the longitudinal oil groove (5), the transverse oil groove (4) and the internal oil channel (2) be supplemented on the side wall of the conventional piston (7) by mechanical processing, so that the cooling lubricating oil can be connected to the piston machined oil channel through the body oil channel (3) so that the lubricating oil can reach the cylinder wall, the piston head and the connecting rod small end bushing and other parts, thereby achieving the purpose of cooling and lubricating; each oil channel is designed with different cross-sectional areas to achieve oil volume and pressure distribution of the cooling lubricating oil; the body oil inlet channel (3), the longitudinal oil groove (5) and the transverse oil groove (4) machined on the side wall of the piston (7) are all located downstream of the piston oil ring (8), thereby preventing the cooling lubricating oil from entering the cylinder and participating in combustion, thereby causing problems such as blue smoke and high lubricating oil consumption.

[0014] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An engine piston cooling and lubrication structure, characterized by: The piston oil ring is arranged on the outer wall of the piston, and the side wall of the piston is provided with a transverse oil groove (4) and a longitudinal oil groove (5), which are located below the piston oil ring, and the transverse oil groove (4) and the longitudinal oil groove (5) are arranged alternately; a piston head cooling and oscillating oil cavity (1) is provided in the piston, and a piston internal oil passage (2) is provided on the piston at a position corresponding to the longitudinal oil groove (5), the piston internal oil passage (2) is communicated with the piston head cooling and oscillating oil cavity (1), and a body oil inlet passage (3) is provided on the side wall of the cylinder and the body; the body oil inlet passage (3) is always connected with the longitudinal oil groove (5) downstream of the piston oil ring during the reciprocating motion of the piston, and then the lubricating oil is coated on the cylinder wall through the transverse oil groove (4), and enters the piston head cooling and oscillating oil cavity (1) and the inner side of the piston through the piston internal oil passage (2).

2. The engine piston cooling and lubrication structure according to claim 1, characterized in that: The engine body oil inlet passage (3) is located downstream of the piston oil ring (8).

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