阅读说明：本技术 一种4l柴油机低窜气量低摩擦柴油机活塞环组件 (Low-blow-by-gas low-friction diesel engine piston ring assembly of 4L diesel engine ) 是由 包毅 张锦 刘红武 苏怀林 覃文 莫昭勤 于 2020-03-02 设计创作，主要内容包括：本发明公开了一种4L柴油机低窜气量低摩擦柴油机活塞环组件,涉及活塞环技术领域。包括第一道气环、第二道刮油环、第三道油环,所述第一道气环外圆面为偏桶形,环高为2.5-2.8mm,所述第一道气环闭口间隙为0.25-0.38mm,所述第一道气环的内圆倒角为C0.5；所述第二道刮油环为锥面换,其为反扭结构,所述第二道刮油环闭口间隙为0.6-0.8mm,所述第三油环弹力为31.2-41.2N,闭口间隙为0.25-0.5mm,环高为3.0-3.2mm。本发明通过对活塞环结构调整降低活塞环窜气通路、提升密封性能、通过下降弹力改善摩擦功,同时降低弹力之后提高了活塞环耐磨性,从而提升整机的可靠性。(The invention discloses a 4L diesel engine piston ring component with low blow-by amount and low friction, and relates to the technical field of piston rings. The oil-gas separator comprises a first gas ring, a second oil scraper ring and a third oil ring, wherein the outer circular surface of the first gas ring is in a barrel shape, the ring height is 2.5-2.8mm, the closed gap of the first gas ring is 0.25-0.38mm, and the inner circular chamfer angle of the first gas ring is C0.5; the second oil scraper ring is in a conical surface exchange structure and is in an anti-twisting structure, the closed gap of the second oil scraper ring is 0.6-0.8mm, the elasticity of the third oil scraper ring is 31.2-41.2N, the closed gap is 0.25-0.5mm, and the ring height is 3.0-3.2 mm. The invention reduces the blow-by passage of the piston ring by adjusting the structure of the piston ring, improves the sealing performance, improves the friction work by reducing the elastic force, and improves the wear resistance of the piston ring after reducing the elastic force, thereby improving the reliability of the whole machine.)

1. A4L diesel engine low blow-by amount low friction diesel engine piston ring assembly, including first gas ring, second oil scraper ring, third oil ring, characterized by that, the excircle of said first gas ring is inclined to the barrel-shaped, the ring height is 2.5-2.8mm, the said first gas ring close gap is 0.25-0.38mm, the said first gas ring inner round chamfer is C0.5; the second oil scraper ring is in a conical surface exchange structure and is in an anti-twisting structure, the closed gap of the second oil scraper ring is 0.6-0.8mm, the elasticity of the third oil scraper ring is 31.2-41.2N, the closed gap is 0.25-0.5mm, and the ring height is 3.0-3.2 mm.

2. The low blow-by amount and low friction diesel piston ring assembly of the 4L diesel engine as claimed in claim 1, wherein said first gas ring is of a positive torsion structure.

3. The low blow-by amount and low friction diesel piston ring assembly of the 4L diesel engine as claimed in claim 2, wherein said first gas ring elastic force is 14.3-22.3N.

4. The piston ring assembly of the 4L diesel engine with low blow-by amount and low friction as recited in claim 3, characterized in that the first gas ring surface coating is a chromium and diamond composite coating.

5. The piston ring assembly of the 4L diesel engine with low blow-by amount and low friction as recited in claim 1, characterized in that the outer circular surface of the second oil scraper ring is a chromium coating with surface phosphating treatment.

6. The piston ring assembly of the 4L diesel engine with low blow-by amount and low friction as recited in claim 1, characterized in that the surface coating of the third oil ring is a chromium-ceramic composite coating.

Technical Field

The invention relates to the technical field of piston ring assemblies, in particular to a piston ring assembly of a 4L diesel engine with low blow-by amount and low friction.

Background

Along with the development of society, people's environmental protection consciousness is constantly strengthened, and the national requirement to emission index is also stricter and stricter in recent years, and the piston ring that is used for sealed, oil control and heat transfer effect just has the key effect to the operating efficiency and whether can stable operation of internal-combustion engine.

The prior piston ring has unsatisfactory effects on air blow-by quantity and friction work. The friction loss of the piston ring and the cylinder sleeve system accounts for more than 25% of the total friction loss, and the reduction of the friction loss is beneficial to improving the mechanical efficiency, reducing the emission of CO2 and reducing the consumption rate of fuel oil. Firstly, the engine type of the prior displacement has a high piston movement speed, and meanwhile, the engine type is upgraded in emission, the maximum design detonation pressure is improved by 20 percent compared with the national fifth, and the corresponding blow-by amount exceeds the design range. Secondly, the axial thickness and the radial thickness of the existing piston ring are large, the contact area with a cylinder sleeve is large, meanwhile, the tangential elasticity of the ring is large, the friction is also increased, and the service life of the cylinder and the piston ring is influenced.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a piston ring assembly of a 4L diesel engine with low blow-by amount and low friction, which reduces a blow-by passage of a piston ring, improves the sealing performance and the friction work by adjusting the structure of the piston ring, and simultaneously improves the wear resistance of the piston ring, thereby improving the reliability of the whole engine.

In order to achieve the purpose, the technical scheme of the invention is as follows:

A4L diesel engine low blow-by amount low friction diesel engine piston ring assembly, including first gas ring, second oil scraper ring, third oil ring, the excircle of said first gas ring is inclined to the barrel-shaped, the ring height is 2.5-2.8mm, the said first gas ring closed gap is 0.25-0.38mm, the inner circle chamfer of said first gas ring is C0.5; the second oil scraper ring is in a conical surface exchange structure and is in an anti-twisting structure, the closed gap of the second oil scraper ring is 0.6-0.8mm, the elasticity of the third oil scraper ring is 31.2-41.2N, the closed gap is 0.25-0.5mm, and the ring height is 3.0-3.2 mm. Therefore, the piston ring assembly is adjusted to reduce the elasticity of the piston ring, and the friction work is reduced, so that the sealing performance of the piston ring is improved, the air blow-by amount is reduced, and the performance of the whole machine is well improved. In addition, the first gas ring can be made of steel material. Such an arrangement may promote the following of the first gas ring.

Preferably, the surface coating of the first gas ring is a chromium and diamond composite coating. Such an arrangement may increase its hardness and wear resistance.

Preferably, the first gas ring is of a positive torsion structure. The running-in performance of the first gas ring is improved, the side sealing performance is improved, and a gas leakage passage is reduced.

Preferably, the elastic force of the first gas ring is 14.3-22.3N. The arrangement can reduce the deformation elasticity and reduce the friction between the first air ring and the cylinder wall.

Preferably, the outer circular surface of the second oil scraper ring is a chromium coating with surface phosphating treatment. Thus, the performance of the running-in and tensile cylinder can be improved, and the effects of corrosion prevention and rust prevention are achieved.

Preferably, the surface plating layer of the third oil ring is a chromium and ceramic composite plating layer. Such an arrangement can increase the hardness and wear resistance of the third oil ring.

The invention has the beneficial effects that:

1. according to the piston ring assembly of the 4L diesel engine, the air leakage amount is low, and the friction is low, the inner circle of the ring is chamfered, so that the first ring is twisted, and the sealing performance of the side face is improved;

2. according to the piston ring assembly of the 4L diesel engine, the height and the thickness of one ring are adjusted, so that the elasticity and the friction work can be reduced;

3. according to the piston ring assembly of the 4L diesel engine, the size of the second closed-end gap is far larger than that of the first closed-end gap, so that the pressure difference between the first ring and the second ring is increased, the sealing performance of the lower end face of the first ring is improved, and the air leakage is reduced.

Drawings

FIG. 1 is a schematic structural diagram of a piston ring assembly of a 4L diesel engine with low blow-by amount and low friction according to an embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view of a second oil scraper ring in a piston ring assembly of a 4L diesel engine with low blow-by amount and low friction according to an embodiment of the present invention;

in the figure, 1-cylinder, 2-piston, 3-first gas ring, 4-second oil scraper ring and 5-third oil ring.

Detailed Description

In order to explain the technical content, the achieved objects and the effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings.