Combined piston ring with air guide grooves

Abstract

The invention relates to the technical field of piston rings, in particular to a combined piston ring with air guide grooves. Comprising a first gas ring, a second gas ring and a third gas ring, a gas guide groove is formed in the inner side of the second gas ring, the third gas ring is located at the gas guide groove, the first gas ring is arranged on the second gas ring and the third gas ring, and the first gas ring, the second gas ring and the third gas ring are arranged in a first piston ring groove in the top of a piston. The opening positions of the piston rings on the upper layer and the lower layer are not changed through the function of the air wedge, so that the piston rings are finally located at the set positions, gaps, welding convex points and grooves are not machined in the planes of the piston rings in the combined ring, and the whole body is not provided with stress concentration points and is reasonable in structure, easy to machine, easy to assemble and low in cost. Meanwhile, engine power is increased, heat efficiency is high, a series of problems caused by cylinder pressure drop after air leakage due to abrasion of a piston ring and an air cylinder are avoided, and the engine is more reliable, energy-saving and environment-friendly.

Description

Technical Field

[0001] The invention relates to the technical field of piston rings, and in particular to a combined piston ring with an air guide groove. Background Art

[0002] The air tightness and leakage of the piston ring and cylinder of a piston engine are closely related to the power, economy, environmental protection and reliability of the engine. The existing piston ring features are as follows: one is that the first gas ring is a single ring, a right-angle opening or a trapezoidal interface; the other is that the first gas ring is a combined structure, and there are two existing structures. One is that the first piston ring groove is equipped with upper and lower layers of piston rings, one gas ring on the upper layer, and the two gas rings on the lower layer are divided into inner and outer gas rings, and the openings are staggered; there is also a combined piston ring that is also equipped with upper and lower layers of gas rings in the first piston ring groove, one gas ring on the upper layer, and two gas rings on the lower layer, a ventilation notch is machined on the middle section of the lower inner gas ring corresponding to the opening of the lower outer gas ring, a boss is positioned at the lower outer gas ring and the inner gas ring opening, a boss is welded at the inner ring opening close to the upper gas ring direction, a groove is machined at the upper gas ring corresponding to the boss of the lower inner gas ring, so that the boss on the lower inner gas ring is positioned with the groove of the upper gas ring to prevent the piston ring from displacement.

[0003] However, the above-mentioned existing combined piston rings have the following disadvantages. First, the notch machined on the middle plane of the lower inner air ring will cause stress concentration at the notch, the strength will be reduced, the ring will easily break, and the engine will be damaged, and the reliability is poor. Secondly, the protrusions of the lower inner air ring welded to the grooves of the upper ring may break when the engine is at high speed and high load, and the risk of the weld falling off and damaging the engine is poor. The reliability is poor, the processing technology is complicated, the manufacturing cost is high, and the assembly is troublesome, and the air ring may be damaged. Summary of the invention

[0004] The purpose of the present invention is to provide a combined piston ring with an air guide groove, aiming to solve the following shortcomings of the above-mentioned existing combined piston rings in the prior art. First, the air vents processed on the plane of the lower inner air ring will cause stress concentration at the notch, the strength is reduced, the ring is easily broken, and the engine is damaged, and the reliability is poor; secondly, the protrusions of the lower inner air ring welded to the grooves of the upper ring are likely to break when the engine is at high speed and high load, and the risk of the weld falling off and damaging the engine is poor, the reliability is poor, and the processing technology is complicated, the manufacturing cost is high, and the assembly is troublesome, and there is a technical problem that the air ring may be damaged.

[0005] To achieve the above-mentioned purpose, the present invention adopts a combined piston ring with an air guide groove, including a first air ring, a second air ring and a third air ring, the second air ring has an air guide groove on the inner side, and the third air ring is located at the air guide groove, and the first air ring is arranged on the second air ring and the third air ring.

[0006] Wherein, the first air ring has a first opening.

[0007] Wherein, the second air ring has a second opening and an air guide groove.

[0008] Wherein, the third air ring has a third opening and an air guide groove.

[0009] The first opening and the third opening may overlap with each other, and the second opening is located on a side opposite to the first opening and the third opening.

[0010] The invention discloses a combined piston ring with an air guide groove, comprising a first air ring, a second air ring and a third air ring, wherein the inner side of the second air ring is provided with an air guide groove, and the third air ring is located at the air guide groove, and the first air ring is arranged on the second air ring and the third air ring, and the opening positions of the upper and lower piston rings are kept unchanged by utilizing the air wedge function, so that the opening positions of the upper and lower piston rings are always in the set position, and there is no machining notch, welding convex point or machining groove on the piston ring plane in the combined ring, and there is no stress concentration point in the whole body, and the structure is reasonable, easy to machine, easy to assemble and low in cost, and at the same time, the engine power is increased, the thermal efficiency is improved, and there is no stress concentration point due to the combined ring. The piston ring and cylinder wear lead to a series of problems caused by the drop in cylinder pressure after leakage. The engine is more reliable, energy-saving and environmentally friendly. In this way, the following shortcomings of the above-mentioned existing combined piston rings are effectively solved. First, the notch processed in the lower inner air ring will cause stress concentration at the notch, the strength is reduced, and the ring is easily broken, which damages the engine and has poor reliability. Secondly, the convex points of the lower inner air ring weld and the grooves of the upper ring may break when the engine is at high speed and high load, and the risk of welding points falling off and damaging the engine is poor reliability. In addition, the processing technology is complicated and the manufacturing cost is high. At the same time, assembly is troublesome, and there is a technical problem of installing a bad air ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0012] Figure 1 It is a three-dimensional stereogram of the first embodiment of the present invention.

[0013] Figure 2 The present invention Figure 1 A partial enlarged view of point A in the middle.

[0014] Figure 3 is a top view of the first embodiment of the present invention.

[0015] Figure 4 The present invention Figure 3 Sectional view along line BB.

[0016] Figure 5 The present invention Figure 4 A partial enlarged view of point C in the middle.

[0017] Figure 6 It is a schematic diagram of the split structure of the first embodiment of the present invention.

[0018] Figure 7 It is a schematic diagram of the installation structure of the first embodiment of the present invention.

[0019] Figure 8 It is a schematic diagram of the structure of the third gas ring after being grooved in the present invention.

[0020] Fig. 9 The present invention Figure 8 A partial enlarged view of point D in the middle.

[0021] Fig.10 It is a schematic diagram of the structure of the third gas ring after being grooved in the present invention.

[0022] 1-first gas ring, 2-second gas ring, 3-gas guide groove, 4-first opening, 5-second opening, 6-third opening, 7-third gas ring, 8-cylinder inner cavity, 9-two-layer gas ring, 10-oil ring, 11-space formed by the combined piston ring and the two-layer gas ring. DETAILED DESCRIPTION

[0023] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0024] See also Figures 1 to 10 The present invention provides a combined piston ring with an air guide groove 3, comprising a first air ring 1, a second air ring 2 and a third air ring 7, wherein the inner side of the second air ring 2 has an air guide groove 3, and the third air ring 7 is located at the air guide groove 3, and the first air ring 1 is arranged on the second air ring 2 and the third air ring 7.

[0025] In this embodiment, the air wedge function is utilized to keep the opening positions of the upper and lower piston rings unchanged so that they are always in the set position, and the structure is reasonable. The plane of the combined ring has no processing notches, no welding convex points, and no processing positioning grooves. It is easy to process, easy to assemble, and has low cost. At the same time, the engine will not suffer a drop in cylinder pressure due to leakage caused by wear of the piston ring and the cylinder, and the engine performance is more reliable. In this way, the following shortcomings of the above-mentioned existing combined piston rings are effectively solved. First, the air vent processed on the lower inner air ring will cause stress concentration at the notch, and the strength will decrease, which will easily break the ring and damage the engine, resulting in poor reliability. Secondly, the convex points of the lower inner air ring weld and the grooves of the upper ring may break when the engine is at high speed and high load, and the risk of the weld point falling off and damaging the engine is low, resulting in poor reliability, complicated processing technology, high manufacturing cost, and troublesome assembly. There is a technical problem of the air ring being damaged.

[0026] Furthermore, the first air ring 1 has a first opening 4 .

[0027] Furthermore, the second air ring 2 has a second opening 5 and an air guide groove 3 .

[0028] Furthermore, the third air ring 7 has a third opening 6 and an air guide groove 3 .

[0029] Further, the first opening 4 and the third opening 6 overlap with each other, and the second opening 5 is located on the opposite side of the first opening 4 and the third opening 6 .

[0030] In the present invention, the gas with high temperature and high pressure enters the first gas guide groove 3 and the second gas guide groove 3 through the first opening 4 and the third opening 6. The gas guide groove 3 and the second gas ring 2 and the third gas ring 7 form a channel. To enter the channel, the gas in the cylinder first needs to pass through three 90-degree right-angle turns, namely, the first right-angle turn where the first opening 4 is close to the second gas ring 2, the second right-angle turn where the third opening 6 is, and then the right-angle turn where the guide surface enters the guide groove 3. The right-angle turn has a buffering effect on the airflow, thereby playing a role in the high-pressure gas. The buffering effect is that the buffered gas will pass through the fourth right-angle corner when entering the second opening 5, and will be blocked by the cylinder wall when the gas is discharged from the second opening 5, thus forming a fifth right-angle corner. The buffer zone of this design becomes low-temperature and low-pressure gas after passing through five right-angle corners, and enters the space 11 and the two-layer air ring at the second opening 5, and blows the oil in the space 11 formed by the combined piston ring and the two-layer air ring back to the crankcase. This design effectively prevents the gas with high temperature and high pressure from directly entering the space 11 formed by the combined piston ring and the two-layer air ring, and burning and oxidizing the oil inside.

[0031] In the present invention, the structural feature of the design is that the upper and lower combined structure of the three rings has good sealing performance; the lower ring of the combined piston ring is composed of the second gas ring 2 and the third gas ring 7, the elasticity of the combined second and third gas rings is weaker than that of the upper ring, and the back pressure makes the second gas ring 2 fit more closely with the cylinder wall, with a smaller light leakage gap, so that the sealing performance is better, and the sealing performance is strengthened, the leakage amount is reduced, and the thermal efficiency is improved; the air guide groove 3 greatly reduces the temperature of the high-temperature gas flowing through, and will not burn and oxidize the engine oil and mixed gas in the space 11 formed by the combined piston ring and the two-layer gas ring, pollute the engine oil, and prolong the use of the engine oil. The service life of the cylinder will be extended without side pushing or knocking; the high-temperature and high-pressure gas has five right-angle turns in the process of passing through the combined ring air path. Because the right-angle channel has a slowing effect on the airflow, the high-pressure and high-speed gas passing through is reduced to low-speed and low-pressure gas, which greatly reduces the gas flow rate; the air guide groove 3 is a set size and will not change with the wear of the piston ring and the cylinder, so that the size of the air guide groove 3 remains unchanged and the gas flow rate is always stable; after the gas passing through the combined piston ring airway is reduced from high-temperature, high-pressure and high-speed to low-temperature, low-pressure and low-speed gas, the oil in the space 11 formed by the combined piston ring and the two-layer air ring is blown back to the crankcase.

[0032] In the present invention, the air guide groove 3 and the third air ring 7 can be used to buffer the gas with strong air pressure, and a small amount of compressed and working gas is used to blow the oil in the space 11 formed by the combined piston ring and the two-layer air ring back to the crankcase, so that the oil consumption is greatly reduced and many problems caused by burning oil will not occur.

[0033] In the present invention, the structural feature of this design is that the size of the air guide groove 3 can be made according to the engine model, and the air guide groove 3 can also be set separately on the inner side of the second air ring 2, and the flow area of ​​the air guide groove 3 can be set according to actual conditions. At this time, after the second air ring 2 and the third air ring 7 are connected, the air guide grooves 3 between the second air ring 2 and the third air ring 7 overlap, thereby forming a channel for gas to pass through.

[0034] In the present invention, the piston ring of this design can effectively improve the sealing of the cylinder, and the cylinder piston ring wear will not cause the cylinder pressure to drop. The leakage of the engine during the compression and power strokes can be reduced by about 90%, the engine torque and power are increased, the fuel consumption is reduced, the thermal efficiency is improved, more energy-saving, less emission is more environmentally friendly, and the oil change cycle is extended.

[0035] In the present invention, the opening gap of the first piston ring of a traditional piston ring engine is straight downward. When working, a high-temperature flame will ignite the mixed gas in the first gas ring and the second gas ring 2, burn and vaporize the engine oil and the mixed gas therein, and form carbon deposits. The exhaust gas then passes through the two-layer gas ring 9 and the oil ring 10 and enters the crankcase, causing the engine oil to oxidize, acidify and deteriorate, forming sludge and exhaust gas, which shortens the service life of the engine oil. The combined piston ring of the present design allows the gas entering between the first gas ring 1 and the second gas ring 2 to enter the space 11 formed by the combined piston ring and the two-layer gas ring only after being extinguished, cooled and limited by the gas guide groove 3, and the low-temperature gas will not burn and oxidize the engine oil in the space 11 formed by the combined piston ring and the two-layer gas ring, so that the engine oil is not easy to deteriorate and the service life is greatly extended.

[0036] In the present invention, there will be no increase in leakage and decrease in cylinder pressure due to wear of the cylinder piston ring, so that the engine power, torque, emission and thermal efficiency are better than those of the traditional live-ring engine. Because the oil-gas mixture in the space 11 formed by the combined piston ring and the two-layer air ring will not be ignited, there will be no side-pushing of the cylinder, so that the wear of the cylinder, piston ring and piston is reduced, the service life is extended, the engine runs more smoothly, the noise is small, the reliability is better, the exhaust gas volume is small, the engine crankcase will not have high internal pressure causing oil seals, sealing components, and supercharger oil leakage, and the oil and gas exhaust will not burn oil when entering the combustion chamber. After the engine does not burn oil, there will be no carbon deposits in the combustion chamber, valves, intake and exhaust pipes, and the load on the ignition system and exhaust gas treatment system is reduced, and the service life is greatly extended.

[0037] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A combined piston ring with an air guide groove, characterized in that: It comprises a first air ring, a second air ring and a third air ring, wherein the inner side of the second air ring is provided with an air guide groove, and the third air ring is located at the air guide groove, and the first air ring is arranged on the second air ring and the third air ring.

2. The combined piston ring with air guide grooves according to claim 1, characterized in that: The first gas ring has a first opening.

3. The combined piston ring with air guide grooves according to claim 2, characterized in that: The second air ring has a second opening.

4. The combined piston ring with air guide grooves according to claim 3, characterized in that: The third air ring member has a third opening.

5. The combined piston ring with air guide grooves according to claim 4, characterized in that: The first opening and the third opening may overlap with each other, and the second opening is located on an opposite side of the first opening and the third opening.

Images