Second flow guide type gas ring groove of piston

Abstract

The second flow guide type gas ring groove comprises the piston, a second gas ring and a second gas ring groove, the second gas ring and the second gas ring groove are arranged at the head of the piston, the second gas ring is sleeved with the second gas ring groove, and the second flow guide type gas ring groove is characterized in that the second gas ring is provided with an elastic opening, the second gas ring is still a full-sealing ring when opened in an air cylinder, and gas is blocked by the second gas ring; the upper side and the lower side of the second gas ring groove are each provided with a second quantitative gas inlet or a second gas inlet, and a second quantitative gas outlet is communicated with the bottom of the second gas ring groove. Through the arrangement of the corresponding positions of a second quantitative gas inlet hole or a second gas inlet and a second quantitative gas outlet hole, downward fuel gas is subjected to second-time flow limiting through the second quantitative gas inlet hole or the second gas inlet and the second quantitative gas outlet hole of a second piston gas ring groove and is quantitatively guided to a concave embedded ring bank, continuous sealing is achieved through lap joint matching of a piston ring, carbon deposition is reduced, and the service life of the piston ring is prolonged. Upward and downward updating circulation of engine oil is achieved, the lubricating effect is improved, engine oil consumption and pollution emission are reduced, and the service life of an engine is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of gas ring groove structures of piston, specifically a kind of piston second channel guide gas ring groove structure for engine and its flow limiting, flow guiding and oil circulation method to gas, oil. BACKGROUND

[0002] Internal combustion engine (engine) piston works in high temperature, high pressure environment, and the key to its efficient operation is good sealing and lubrication. The existing structure of piston usually adopts two gas rings and one oil ring, which are responsible for lubrication and blocking high pressure gas to prevent leakage. The second gas ring is commonly a flat ring, which is widely used in the piston of internal combustion engine due to its simple structure and low cost.

[0003] The working principle of its gas ring is shown in Figure 1 When the piston and the gas ring are installed in the cylinder, three gaps are formed between the piston, the gas ring and the cylinder wall, i.e. the end gap, the side gap and the back gap. That is, the outer diameter of the piston gas ring in free state is slightly larger than the diameter of the cylinder.

[0004] However, the flat gas ring has obvious defects. Firstly, the initial air leakage is large, and the air leakage increases further with the deepening of wear and tear, which is difficult to control accurately. Secondly, the flat ring structure is relatively simple, and when the oil rises, the oil volume is too large, and too much oil enters the combustion chamber to participate in combustion and produce carbon deposits. The excessive downward flow of gas causes sharp sweeping of the piston head, resulting in insufficient oil supply to the contact surface between the outer circular surface of the gas ring and the cylinder wall, aggravating the friction between the outer circular surface of the gas ring and the cylinder wall, increasing the wear and tear, and ultimately shortening the service life of the engine.

[0005] After long-term application test, some use lap setting, such as patent No. 00248108.1. If this gas ring is used in the second gas ring groove, it is found that although good sealing can be achieved, the oil is easily detained on the piston head and cannot flow downward to update, accelerating the gasification and deterioration of the oil, and the overall use is not good.

[0006] Therefore, a second gas ring groove guide structure for internal combustion engine piston is provided, which can further improve the sealing effect of gas and the lubrication performance of cylinder wall, realizes the flow limiting, flow guiding of downward gas and oil, upward air and oil, and the circulation and updating of oil, to effectively solve the problems of large air leakage, excessive oil entering the combustion chamber and insufficient lubrication existing in the second gas ring groove and flat gas ring structure. SUMMARY

[0007] The present application provides a piston guide gas ring groove and its flow limiting, flow guiding and oil circulation method to solve the problems raised in the background.

[0008] To achieve the above object, the present application adopts the following technical solutions:

[0009] A piston second channel type air ring groove, comprising a piston and an air ring two and an air ring groove two arranged on the head of the piston, the air ring two being sleeved on the air ring groove two, characterized in that the air ring two is provided with an elastic opening and is still a full sealing ring when it is opened in the cylinder, and the upper and lower sides of the air ring groove two are respectively provided with a second quantitative air inlet hole or air inlet port two and a second quantitative air outlet hole which are communicated with the bottom of the air ring groove two.

[0010] After the piston is installed in the cylinder, the upper part of the piston is a combustion chamber, the top of the combustion chamber is provided with a valve air inlet face and a valve air outlet face arranged in relative positions, the position of the vertical top surface of the piston perpendicular to the middle of the valve air inlet face is set as 6 o'clock, and the position of the vertical top surface of the piston perpendicular to the middle of the valve air outlet face is set as 0 o'clock.

[0011] The second quantitative air inlet hole or air inlet port two and the second quantitative air outlet hole must be arranged at the 6 o'clock or 0 o'clock positions on the upper and lower sides of the air ring groove two, and in operation, in combination with the air ring two, a new U-shaped path two for the up and down flow of oil and gas is formed.

[0012] Preferably, the piston air ring two is a single-layer double-ladder notch full sealing ring with a lower outer cutting structure, or a single-layer single-ladder notch full sealing ring with a lower outer cutting structure, the air ring two is provided with a lower outer cutting structure, and the lower outer cutting structure forms an oil distribution cavity.

[0013] Preferably, when the air ring two is a single-layer double-ladder notch full sealing ring with a lower outer cutting structure, the two opening ends thereof are double-ladder notch one and double-ladder notch two respectively, the double-ladder notch one and the double-ladder notch two are complementary structures, the maximum opening of the double-ladder notch one and the double-ladder notch two is in butt joint at the end of the notch, and the right-angled turning part of the short tongue end of the double-ladder notch one is provided with an inner concave arc hole.

[0014] Preferably, when the air ring two is a single-layer single-ladder notch full sealing ring with a lower outer cutting structure, the short tongue end is arranged on the inner side of the recessed interface end, the recessed interface end, the protruding tongue notch end and the short tongue end form a half-wrapped plug-in sealing structure, and the right-angled turning part of the recessed interface end connected with the short tongue end is provided with an inner concave arc hole.

[0015] The inner concave arc hole is arranged for the following purposes: 1. to facilitate the milling cutter to process the right-angled part of the double-ladder notch one and the recessed interface end; 2. to buffer the oil; and 3. to play a role of turning, disturbing and buffering the leaked gas when the piston is subjected to the gas ram.

[0016] Preferably, the quantitative air inlet hole two and the quantitative air outlet hole two are further arranged corresponding to the opening of the air ring two;

[0017] When the air ring two is a single-layer double-step overlap band lower-outer-enclosing structure full sealing ring, since the ring body has no air hole on both sides of the overlap axial direction when it is opened in the cylinder, the air ring groove two must be provided with the quantitative air inlet hole two and the quantitative air outlet hole two on both sides;

[0018] When the air ring two is a single-layer single-step overlap band lower-outer-enclosing structure full sealing ring, since the ring body forms the air inlet hole two on the upper side of the overlap axial direction when it is opened in the cylinder, the air ring groove two does not need to be provided with the quantitative air inlet hole two on the upper side, but must be provided with the quantitative air outlet hole two on the lower side.

[0019] The air ring groove one is arranged above the air ring groove two, and the air ring one is arranged in the air ring groove one; the oil ring groove is arranged below the air ring groove two, and the oil ring is arranged in the oil ring groove; the air ring groove one and the air ring groove two are ring banks, and the air ring groove two and the oil ring groove are concave-embedded ring banks. The air ring two is provided with a lower-outer-enclosing structure at the bottom, and the oil ring groove is provided with a plurality of oil return holes corresponding to the 0 o'clock and 6 o'clock positions of the piston circular surface.

[0020] The size of the quantitative air inlet hole and the quantitative air outlet hole of the air ring groove two can be punched according to the requirements of different vehicle engines.

[0021] The above structure is a second air ring groove structure for limiting and guiding the downward air, mixed gas or fuel gas, and is also a second air ring groove structure for limiting and guiding the upward air and oil circulation.

[0022] A method for limiting and guiding fuel gas and oil circulation based on the above-mentioned piston second air ring groove structure, comprising the following steps:

[0023] When the piston enters the compression, work and exhaust strokes, a large amount of air, mixed gas or fuel gas passes through the first air ring barrier, a small amount of fuel gas flows downward to the ring bank, the fuel gas reaching the ring bank pressurizes the front surface of the air ring two, except that a small part of the fuel gas leaks downward from the outer circular surface of the ring body to the cylinder wall and the overlap gap between the ring bodies, the remaining part of the air, mixed gas or fuel gas enters the back surface of the air ring two from the upper gap, together with another part of the fuel gas introduced into the back surface of the air ring two from the quantitative air inlet hole two or the air inlet hole two at the 6 o'clock or 0 o'clock position, to establish side pressure, and is guided out from the quantitative air outlet hole two at the corresponding 6 o'clock or 0 o'clock position into the concave-embedded ring bank;

[0024] Even if a part of the air, mixed gas or fuel gas entering the ring bank is guided to the concave-embedded ring bank through the new U-shaped path two composed of the quantitative air inlet hole two or the air inlet hole two of the air ring groove two, the back surface of the air ring two and the quantitative air outlet hole two;

[0025] The air, mixed gas or fuel gas reaching the concave-embedded ring bank enters the oil ring cavity from the upper side of the scraping port of the combined oil ring or the integral oil ring port, and is discharged into the crankcase through the oil return hole; at the same time, the air ring two uniformly coats the cylinder wall working surface with the oil stored in the ring bank and the concave-embedded ring bank.

[0026] The process of air, mixed gas or fuel gas descending into the crankcase is also the process of purging and driving the oil to flow back to the crankcase.

[0027] When the piston moves downward in the suction stroke, the oil in the crankcase is guided in the opposite direction of the original descending path of air, mixed gas or fuel gas, so as to realize the renewal cycle of the oil on the piston head.

[0028] The bottom of the air ring two is provided with a lower outer cutting structure, and when the piston moves upward, the oil guided to the concave-embedded ring bank and the ring bank is uniformly coated on the cylinder wall working surface.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] The flow-limiting and flow-guiding structure formed by the air ring groove two cooperates with the lap joint at the elastic opening of the air ring two, so as to ensure that the air ring two has sufficient expansion elastic space when blocking air, and at the same time, the opening and closing are always in an uninterrupted sealing state, thereby realizing high sealing of the fuel gas; then, the U-shaped path two formed by the corresponding position of the quantitative air inlet hole two or the air inlet hole two and the quantitative air outlet hole two set by the air ring groove two realizes that the oil stored in the ring bank is purged and driven into the concave-embedded ring bank by the quantitative fuel gas; the path formed by the flow-limiting and flow-guiding structure of the air ring groove two is connected with the ring bank and the air ring groove one at the top and connected with the concave-embedded ring bank and the oil ring cavity at the bottom, so that the piston as a whole is used, and the flow-limiting and flow-guiding control of the descending fuel gas and oil and the ascending air and oil are realized.

[0031] At the same time, when the piston enters the suction stroke, the oil can enter the oil ring cavity, the concave-embedded ring bank, the ring bank and the upper part of the ring bank in time and in sufficient amount from the oil return hole, so as to ensure the oil supply on the working surface between the piston ring and the cylinder wall, and when the piston enters the working and exhaust strokes, the oil is purged and driven to flow back to the crankcase by the induced fuel gas, so as to realize the process of completing the up-and-down cycle and storage renewal of the oil on the piston head.

[0032] The structure of the present application completely realizes the avoidance of excessive purging of oil by fuel gas and the avoidance of detention of oil, thereby avoiding the gasification and excessive shearing of oil and accelerating the deterioration of oil, reducing the carbon deposition pollution and consumption of oil, effectively improving the lubricating effect, avoiding the carbon deposition between the air ring one, the air ring two and the oil ring, and ensuring the good reciprocating motion of the piston as a whole. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a schematic diagram of the end gap, side gap and back gap between the existing piston and piston ring.

[0034] Figure 2 Piston top round surface azimuth position diagram of the present application;

[0035] Figure 3 Piston structure diagram formed by the structure of the present application;

[0036] Figure 4 Stepwise notch double-layer combined misassembled full sealing ring structure diagram of the present application;

[0037] Figure 5 Flat notch and stepwise notch double-layer combined misassembled full sealing ring structure diagram of the present application;

[0038] Figure 6 Single-layer double-stepwise notch full sealing ring structure diagram of the present application with lower external cutting structure;

[0039] Figure 7 Single-layer double-stepwise notch full sealing ring notch part front enlarged diagram of the present application with lower external cutting structure;

[0040] Figure 8 Single-layer double-stepwise notch full sealing ring notch part bottom enlarged diagram of the present application with lower external cutting structure;

[0041] Figure 9 Single-layer single-stepwise notch full sealing ring structure diagram of the present application with lower external cutting structure;

[0042] Figure 10 Single-layer single-stepwise notch full sealing ring notch part front enlarged diagram of the present application with lower external cutting structure;

[0043] Figure 11 Single-layer single-stepwise notch full sealing ring notch part bottom enlarged diagram of the present application with lower external cutting structure;

[0044] Figure 12 Another side view of the piston structure formed by the structure of the present application;

[0045] Figure 13 Air, mixture or fuel gas and oil (downward) flow direction part of the piston head in compression, working and exhaust strokes of the present application;

[0046] 1, piston; 2, ring land; 21, gas ring one; 22, gas ring two; 23, oil ring; 24, gas ring groove one; 25, gas ring groove two; 26, oil ring groove; 3, concave ring land; 31, quantitative intake hole one; 32, quantitative exhaust hole one; 33, quantitative intake hole two; 34, quantitative exhaust hole two; 35, intake port one; 36, intake port two; 41, upper oil ring scraping piece; 42, lower oil ring scraping piece; 43, oil ring cavity; 44, oil return hole; 45, inner concave arc hole; 51, upper ring; 52, lower ring; 61, flat mouth upper ring; 71, double ladder step lap one; 72, double ladder step lap two; 81, concave gap interface end; 82, tongue lap end; 91, valve intake face; 92, valve exhaust face; 93, lower outer cutting structure. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0048] Reference Figures 1 to 13 , Embodiment one, a second guide type gas ring groove of a piston, comprising a piston 1 and a gas ring two 22 and a gas ring groove two 25 arranged on the head of the piston, the gas ring two 22 is sleeved on the gas ring groove two 25, the gas ring two 22 is provided with an elastic opening and is still a full sealing ring when it is opened in the cylinder, and the gas ring two 22 blocks the fuel gas; the upper and lower sides of the gas ring groove two 25 are respectively provided with a quantitative intake hole two 33 or an intake port two 36, a quantitative exhaust hole two 34, and the quantitative exhaust hole two 34 is communicated with the bottom of the gas ring groove two 25.

[0049] As Figure 3 shown, after the piston 1 is installed in the cylinder, the upper part of the piston 1 is a combustion chamber, the combustion chamber is provided with a valve intake face 91 and a valve exhaust face 92 arranged at opposite positions at the top, the top circular surface of the piston 1 is vertically provided with a 6 o'clock position at the middle of the valve intake face 91, and the top circular surface of the piston 1 is vertically provided with a 0 o'clock position at the middle of the valve exhaust face 92.

[0050] The quantitative intake hole two 33 or the intake port two 36 and the quantitative exhaust hole two 34 must be arranged at the 6 o'clock or 0 o'clock positions corresponding to the upper and lower sides of the gas ring groove two 25, and combined with the gas ring two 22, to form a new U-shaped path two for the up and down flow of the oil and the fuel gas.

[0051] From the quantitative intake hole one 31 or the intake port one 35 (as Figure 5 shown) → the quantitative exhaust hole one 32 → the ring land 2 → the quantitative intake hole two 33 or the intake port two 36 (as Figure 10(As shown) → quantitative air outlet 2 34 → recessed ring land 3 → oil ring cavity 43 → oil return hole 44, forming the entire path for air, mixed gas or gas to drive the oil downward.

[0052] The aforementioned path serves as both a downward flow and pressure guiding path for air, air-fuel mixture, or fuel gas, and a path for the upper and lower lubrication and oil renewal of engine oil. This forms a flow-controllable buffer, cache, and circulation guiding system, ensuring that the engine oil is promptly renewed during each intake stroke, thereby improving the lubrication effect of piston 1.

[0053] The second air ring 22 is a single-layer double-step overlap with a lower outer tangent structure, a fully sealed ring. Figure 6 ), or a single-layer, single-step overlap with a lower outward-cut, fully sealed ring ( Figure 9 The second air ring 22 is provided with a lower outer tangent structure 93, which forms an oil distribution cavity.

[0054] When the gas ring 22 is Figure 6 When a single-layer double-step joint with a lower external tangent structure is used for a fully sealed ring, its two open ends are double-step joint one 71 and double-step joint two 72, respectively. The double-step joint one 71 and double-step joint two 72 are complementary structures. The maximum openings of the double-step joint one 71 and double-step joint two 72 are joined at the ends of the joint. The right-angle turn of the short tongue end of the double-step joint one 71 is provided with an inwardly concave arc hole 45.

[0055] When the gas ring 22 is Figure 9 When a single-layer single-step overlap with an externally tangential structure is used to form a fully sealed ring, a short tongue end is provided on the side of the concave interface end 81 near the back of the ring. The concave interface end 81, the convex overlap end 82 and the short tongue end cooperate to form a semi-enclosed plug-in sealing structure. An inwardly concave arc hole 45 is provided at the right-angle turn where the concave interface end 81 connects with the short tongue end.

[0056] The concave arc hole 45 serves three purposes: first, it facilitates the milling cutter in machining the right-angled portion within the double-step joint 71 and the recessed interface 81; second, it further serves to buffer the engine oil; and third, when the piston 1 is subjected to the pressure of the combustion gas, the concave arc hole 45 acts as a deflector, turbulent flow, and buffer to reduce the pressure of the leaking combustion gas.

[0057] The quantitative air inlet port 23 and the quantitative air outlet port 24 are further configured to correspond to the openings of the air ring 22:

[0058] When the second air ring 22 is a single-layer double-step joint with a lower outer tangent structure full-sealing ring, since there are no air holes on the upper and lower sides of the joint axis when the ring body is opened in the cylinder, the upper and lower sides of the second air ring groove 25 must be provided with an air inlet 33 and a metered air outlet 34 respectively.

[0059] When the gas ring two 22 is a single-layer single-step full-sealing ring with an outer tangent structure, the upper side of the gas ring groove two 25 does not need to be provided with a quantitative air inlet hole two 33, and the lower side needs to be provided with a quantitative air outlet hole two 34. Figure 10

[0060] The gas ring groove two 25 is provided above with a gas ring groove one 24, and the gas ring groove one 24 is sleeved with a gas ring one 21; the gas ring groove two 25 is provided below with an oil ring groove 26, and the oil ring groove 26 is sleeved with an oil ring 23; the gas ring groove one 24 and the gas ring groove two 25 are the ring bank 2, and the gas ring groove two 25 and the oil ring groove 26 are the concave-embedded ring bank 3.

[0061] The bottom of the gas ring two 22 is provided with a circle of outer tangent structure 93, and the bottom of the oil ring groove 26 is provided with a plurality of oil return holes 44 corresponding to the 0 o'clock and 6 o'clock positions of the piston circular surface.

[0062] A method for limiting and guiding the flow of gas and oil and circulating oil based on the second guide-type gas ring groove of the piston as described above, comprising the following:

[0063] When the piston 1 enters the compression, work and exhaust strokes, a large amount of air, mixture or fuel gas is blocked by the first gas ring, a small amount of air, mixture or fuel gas descends to the ring bank 2, and the air, mixture or fuel gas reaching the ring bank 2 pressurizes the front surface of the gas ring two 22. Except that a small part of the air, mixture or fuel gas bounces radially from the outer circular surface of the ring body to the cylinder wall and the ring body overlap gap, the rest of the air, mixture or fuel gas enters the back of the ring from the upper gap, together with another part of the air, mixture or fuel gas introduced into the back of the gas ring two 22 from the quantitative air inlet hole two 33 or the air inlet two 36 at the 6 o'clock or 0 o'clock position, and the side pressure is established, and the air, mixture or fuel gas is guided from the corresponding quantitative air outlet hole two 34 at the 6 o'clock or 0 o'clock position into the concave-embedded ring bank 3,

[0064] Even if a part of the air, mixture or fuel gas entering the ring bank 2 is guided to the concave-embedded ring bank 3 from the new U-shaped path two composed of the quantitative air inlet hole two 33 or the air inlet two 36 of the gas ring groove two 25, the back of the gas ring two 22 and the quantitative air outlet hole two 34.

[0065] The air, mixture or fuel gas reaching the concave-embedded ring bank 3 enters the oil ring cavity 43 from the scraper 41 port or the integrated oil ring port of the combined oil ring, and flows back to the crankcase through the oil return hole 44. At the same time, the gas ring two 22 coats the oil stored in the ring bank 2 and the concave-embedded ring bank 3 on the cylinder wall working surface downward.

[0066] The process of air, mixture or fuel gas descending into the crankcase is also the process of blowing and driving oil downward to flow back to the crankcase.

[0067] ​When the piston 1 enters the intake stroke and moves downward, the oil in the crankcase is guided in the opposite direction of the downward path of the air, mixture or gas, achieving the renewal cycle of the oil on the head of the piston 1.

[0068] That is, when the piston 1 enters the intake stroke and moves downward, the oil splashed and sprayed from the bottom of the crankcase is sucked into the oil ring cavity 43 from the oil return hole 44, and then guided into the recessed ring bank 3 from the port of the combined oil ring upper scraping piece 41 or the port of the integrated oil ring, and then guided into the bottom of the gas ring groove two 25 from the quantitative gas inlet hole two 33 or the gas inlet hole two 36.

[0069] A circle of lower outer cutting structure 93 is arranged at the bottom of the gas ring two 22, which uniformly coats the oil guided to the recessed ring bank 3 and the ring bank 2 on the cylinder wall working surface when the piston 1 moves upward.

[0070] The flow-limiting and flow-guiding structure formed by the gas ring groove two 25 cooperates with the lap joint at the elastic opening of the gas ring two 22 to ensure that the gas ring two 22 has sufficient expansion elastic space when blocking the gas, and at the same time, the lap joint is always in a state of uninterrupted sealing, achieving high sealing of the gas; then the U-shaped path two formed by the corresponding positions of the quantitative gas inlet hole two 33 or the gas inlet hole two 36 and the quantitative gas outlet hole two 34 arranged in the gas ring groove two 25, realizes that the oil accumulated in the ring bank 2 is swept and driven into the recessed ring bank 3 by the quantitative gas; the path formed by the flow-limiting and flow-guiding structure of the gas ring groove two 25 is connected to the ring bank 2 and the gas ring groove one 24 at the top, and connected to the recessed ring bank 3 and the oil ring cavity 43 at the bottom, so that the piston 1 is used as a whole, realizing the flow-limiting and flow-guiding control of the downward gas and oil, and the upward air and oil.

[0071] At the same time, when the piston 1 enters the intake stroke, the oil can enter the oil ring cavity 43, the recessed ring bank 3, the ring bank 2 and the upper part of the ring bank 2 from the oil return hole 44 in time and in sufficient amount, ensuring the oil supply between the piston ring and the cylinder wall working surface, and when the piston 1 enters the working and exhaust strokes, the oil is swept and driven back to the crankcase by the induced gas, realizing the process of completing the up-and-down circulation and updating of the oil on the piston head.

[0072] Embodiment two, based on the structure of embodiment one, is further refined:

[0073] The gas ring groove two 25 is provided with a gas ring groove one 24, the gas ring groove one 24 is provided with a gas ring one 21, and the gas ring groove one 24 is provided with a quantitative gas inlet hole one 31 or a gas inlet hole one 35, and a quantitative gas outlet hole one 32 on the upper and lower sides respectively.

[0074] The gas ring one 21 is a kind of stepped lap joint double-layer combined full sealing ring Figure 4 ), or a kind of flat mouth and stepped lap joint double-layer combined full sealing ring Figure 5), or other matching full seal gas ring. The oil ring 23 is an existing combined oil ring or an integral oil ring.

[0075] When the gas ring one 21 is Figure 4 a full seal double-layer combined staggered gas ring with stepped mouth and flat mouth, comprising a flat mouth upper ring 61 and a lower ring 52, the port of the flat mouth upper ring 61 forms an air inlet one 35, and the port of the flat mouth upper ring 61 is staggered and overlapped with the mouth of the lower ring 52 to form a full seal double-layer combined gas ring.

[0076] When the gas ring one 21 is Figure 5 a full seal double-layer combined staggered gas ring with stepped mouth and flat mouth, comprising a flat mouth upper ring 61 and a lower ring 52, the port of the flat mouth upper ring 61 forms an air inlet one 35, and the port of the flat mouth upper ring 61 is staggered and overlapped with the mouth of the lower ring 52 to form a full seal double-layer combined gas ring.

[0077] When the gas ring one 21 is a full seal double-layer combined staggered gas ring with stepped mouth, the quantitative air inlet hole one 31 and the quantitative air outlet hole one 32 are arranged in corresponding positions, then from the quantitative air inlet hole one 31 to the back of the gas ring one 21 and the gap between the bottom of the gas ring groove one 24, to the quantitative air outlet hole one 32, a new U-shaped path one of descending gas is formed; or the quantitative air inlet hole one 31 and the quantitative air outlet hole one 32 are arranged in staggered positions, then from the quantitative air inlet hole one 31 to the gap between the back of the gas ring one 21 and the bottom of the gas ring groove one 24, to the quantitative air outlet hole one 32, a new arc-shaped extended path of descending gas is formed.

[0078] When the gas ring one 21 is a full seal double-layer combined staggered gas ring with stepped mouth and flat mouth, the air inlet one 35 (as shown in Figure 5 ) and the quantitative air outlet hole one 32 are arranged in staggered positions, then from the air inlet one 35 to the gap between the back of the gas ring one 21 and the bottom of the gas ring groove one 24, to the quantitative air outlet hole one 32, a new arc-shaped extended path of descending gas is formed.

[0079] The sizes of the quantitative air inlet and outlet holes of the gas ring groove two 25 and the gas ring groove one 24 can be punched according to the requirements of different vehicle engines to realize a certain degree of self-defined gas entering amount into the ring bank 2, the concave-embedded ring bank 3 and the oil ring cavity 43, and the gas leakage amount is not affected by the wear of the gas ring one 21, the gas ring two 22 and the oil ring 23, and the fixed gas flow amount can be stably maintained for a long time.

[0080] Example three is a matching example based on the structure of the above examples, specifically the installation method.

[0081] 1. When the gas ring one 21 is a full seal double-layer combined staggered gas ring with stepped mouth, and the gas ring two 22 is a single-layer double-stepped mouth full seal ring with lower outer cutting structure, the installation is as follows: Figure 4 Figure 6

[0082] ​​① If the quantitative air inlet 31 is set at the 0 o'clock position and the quantitative air outlet 32 ​​is set at the 0 o'clock position, then the upper ring 51 of a stepped double-layer combined misaligned full-seal ring should be aligned with the 3 o'clock or 9 o'clock position, and the lower ring 52 should be aligned with the 9 o'clock or 3 o'clock position. The joint of a single-layer double-stepped joint with a lower outward-cut structure full-seal ring can be aligned with the 1:30 or 10:30 position.

[0083] ② If the quantitative air inlet 31 is set at the 0 o'clock position and the quantitative air outlet 32 ​​is set at the 6 o'clock position, then the upper ring 51 of a stepped double-layer combined misaligned full-seal ring is aligned with the 9 o'clock position, the bottom surface of the lower ring 52 is installed on the front, and the joint is aligned with the 3 o'clock position. The joint of a single-layer double-stepped joint with a lower outward-cut structure full-seal ring can be aligned with the 9 o'clock position.

[0084] ③ If the quantitative air inlet 31 is set at the 3 o'clock position and the quantitative air outlet 32 ​​is set at the 0 o'clock position, then the upper ring 51 of a stepped double-layer combined misaligned full-seal ring is aligned with the 9 o'clock position, and the lower ring 52 is aligned with the 1:30 o'clock position. The joint of a single-layer double-stepped joint with a lower outward-cut structure full-seal ring is aligned with the 10:30 o'clock position.

[0085] ④ If the quantitative air inlet 31 is set at the 9 o'clock position and the quantitative air outlet 32 ​​is set at the 0 o'clock position, then the upper ring 51 of a stepped double-layer combined misaligned fully sealed ring can be aligned with the 3 o'clock position, and the bottom surface of the lower ring 52 can be installed with the front facing, with the joint aligned with the 10:30 position. Meanwhile, the joint of a single-layer double-stepped joint fully sealed ring with a lower outer tangent structure should be aligned with the 1:30 position.

[0086] 2. When the air ring is 21 Figure 4 A stepped joint double-layer composite staggered fully sealed ring, while the second gas ring 22 is... Figure 9 Installation of a single-layer, single-step overlap with a lower externally tangential structure and a fully sealed ring:

[0087] ① If the quantitative air inlet 31 is set at the 0 o'clock position and the quantitative air outlet 32 ​​is set at the 0 o'clock position, then the upper ring 51 of a stepped double-layer combined misaligned full-seal ring should be aligned with the 3 o'clock or 9 o'clock position, and the lower ring 52 should be aligned with the 9 o'clock or 3 o'clock position. The joint of a single-layer single-step joint with a lower outward-cut structure full-seal ring should be aligned with the 6 o'clock position.

[0088] ② If the quantitative air inlet 31 is set at the 0 o'clock position and the quantitative air outlet 32 ​​is set at the 6 o'clock position, then the upper ring 51 of a stepped double-layer combined misaligned full-seal ring is aligned with the 9 o'clock position, the bottom surface of the lower ring 52 is installed on the front, and the joint is aligned with the 3 o'clock position. However, the joint of a single-layer single-step joint full-seal ring with a lower outward tangent structure must be aligned with the 0 o'clock position.

[0089] ③ If the quantitative air inlet 31 is set at the 3 o'clock position and the quantitative air outlet 32 ​​is set at the 0 o'clock position, then the upper ring 51 of a stepped double-layer combined misaligned full-seal ring is aligned with the 9 o'clock position, and the lower ring 52 is aligned with the 1:30 o'clock position. The joint of a single-layer single-step joint with a lower outward-cut structure full-seal ring is aligned with the 6 o'clock position.

[0090] ④ If the quantitative air inlet 31 is set at the 9 o'clock position and the quantitative air outlet 32 ​​is set at the 0 o'clock position, then the upper ring 51 of a stepped double-layer combined misaligned fully sealed ring can be aligned with the 3 o'clock position, and the bottom surface of the lower ring 52 can be installed with the front facing, with the joint aligned with the 1:30 o'clock position. The joint of a single-layer single-step joint with a lower outward-cut structure fully sealed ring should be aligned with the 6 o'clock position.

[0091] 3. When the air ring is 21 Figure 5 A double-layer combination of flat and stepped joints with a fully sealed ring, while the second gas ring 22 is... Figure 10 Installation of a single-layer double-step overlap with a lower outward-cut fully sealed ring:

[0092] ① If the quantitative air inlet 31 is set at the 0 o'clock position and the quantitative air outlet 32 ​​is set at the 0 o'clock position, then the above-mentioned double-layer combination of flat opening and stepped overlap with misaligned full sealing ring is not suitable.

[0093] ② If the quantitative air inlet 31 is set at the 0 o'clock position and the quantitative air outlet 32 ​​is set at the 6 o'clock position, then the upper ring 51 of a double-layer combination of flat and stepped joint fully sealed ring is aligned with the 0 o'clock position, and the lower ring 52 is aligned with the 3 o'clock position. The joint of a single-layer double-step joint fully sealed ring with a lower outer tangent structure is aligned with the 9 o'clock position.

[0094] ③ If the quantitative air inlet 31 is set at the 3 o'clock position and the quantitative air outlet 32 ​​is set at the 0 o'clock position, then the upper ring 51 of a double-layer combination of flat and stepped joint fully sealed ring must be aligned with the 3 o'clock position and the lower ring 52 must be aligned with the 9 o'clock position. The joint of a single-layer double-step joint fully sealed ring with a lower outer tangent structure can be aligned with the 10:30 position.

[0095] ④ If the quantitative air inlet 31 is set at the 9 o'clock position and the quantitative air outlet 32 ​​is set at the 0 o'clock position, then the upper ring 51 of a double-layer combination of flat and stepped joint fully sealed rings should be aligned with the 9 o'clock position, and the lower ring 52 should be aligned with the 3 o'clock position. However, the joint of a single-layer double-step joint fully sealed ring with a lower outer tangent structure can be aligned with the 1:30 position.

[0096] 4. When the air ring is 21 Figure 5 A double-layer combination of flat and stepped joints with a fully sealed ring, while the second gas ring 22 is... Figure 9The installation of a single-layer single-step notch full seal ring with an under-cut structure:

[0097] ① If the quantitative air inlet hole 31 is set at the 0 o'clock position and the quantitative air outlet hole 32 is set at the 0 o'clock position, the above-mentioned flat notch and step notch double-layer combined misassembled full seal ring is not suitable;

[0098] ② If the quantitative air inlet hole 31 is set at the 0 o'clock position and the quantitative air outlet hole 32 is set at the 6 o'clock position, the notch of the upper ring 51 of the flat notch and step notch double-layer combined misassembled full seal ring is aligned with the 0 o'clock position, the notch of the lower ring 52 can be aligned with the 9 o'clock position, and the notch of a single-layer single-step notch full seal ring with an under-cut structure should be aligned with the 0 o'clock position;

[0099] ③ If the quantitative air inlet hole 31 is set at the 3 o'clock position and the quantitative air outlet hole 32 is set at the 0 o'clock position, the notch of the upper ring 51 of the flat notch and step notch double-layer combined misassembled full seal ring must be aligned with the 3 o'clock position, and the notch of the lower ring 52 must be aligned with the 9 o'clock position, and the notch of a single-layer single-step notch full seal ring with an under-cut structure should be aligned with the 6 o'clock position;

[0100] ④ If the quantitative air inlet hole 31 is set at the 9 o'clock position and the quantitative air outlet hole 32 is set at the 0 o'clock position, the notch of the upper ring 51 of the flat notch and step notch double-layer combined misassembled full seal ring must be aligned with the 9 o'clock position, and the notch of the lower ring 52 must be aligned with the 3 o'clock position, and the notch of a single-layer single-step notch full seal ring with an under-cut structure should also be aligned with the 6 o'clock position.

[0101] The oil ring groove 26 is provided with an oil ring 23. The oil ring 23 is a commonly used structure of existing pistons, which is not uniquely limited here.

[0102] If a combined oil ring is used, it includes an upper wiper 41, an inner liner, and a lower wiper 42, which clamps the inner liner in the middle to form an oil ring cavity 43.

[0103] If an integrated oil ring is used, it is composed of an oil ring outer frame and a supporting spring, and the inner space of the oil ring outer frame and the supporting spring form an oil ring cavity 43.

[0104] The installation of the oil ring 23 is the same as the existing method.

[0105] The above structure can be further optimized:

[0106] The flow-limiting and flow-guiding structure of the gas ring groove two 25 relies on the lap joint of the elastic opening of the gas ring two 22 to ensure that the gas ring two 22 retains sufficient expansion elasticity space when blocking the gas, and at the same time, the opening and closing are in an uninterrupted sealing state, realizing high sealing of the gas. Then, the U-shaped path two formed by the corresponding position of the quantitative air inlet hole two 33 or the air inlet hole two 36 and the quantitative air outlet hole two 34 set in the gas ring groove two 25 realizes that the oil accumulated in the ring bank 2 is swept and driven into the recessed ring bank 3 by the quantitative gas, that is, it is introduced from the quantitative air inlet hole two 33 or the air inlet hole two 36, and it is discharged from the quantitative air outlet hole two 34 and discharged into the recessed ring bank 3.

[0107] The path formed by the flow-limiting and flow-guiding structure of the gas ring groove two 25 is connected to the ring bank 2 and the gas ring groove one 25 at the top and connected to the recessed ring bank 3 and the oil ring cavity 43 at the bottom, so that the piston 1 as a whole is used to realize the flow-limiting and flow-guiding control of the descending gas and oil and the ascending air and oil.

[0108] At the same time, when the piston 1 enters the suction stroke, the oil can enter the oil ring cavity 43, the recessed ring bank 3, the ring bank 2 and the upper part of the ring bank 2 in time and in sufficient amount from the oil return hole 44, ensuring the oil supply between the piston ring and the cylinder wall, and when the piston 1 enters the working and exhaust strokes, the oil is swept and driven back to the crankcase by the induced flow gas, realizing the process of completing the up-and-down circulation and updating of the oil on the head of the piston 1, avoiding excessive sweeping of the oil by the gas and avoiding the detention of the oil, thereby avoiding the gasification and excessive shearing of the oil to accelerate the deterioration of the oil, reducing the carbon deposition and consumption of the oil, effectively improving the lubrication effect, avoiding the carbon deposition between the gas ring one 21, the gas ring two 22 and the oil ring 23, and ensuring the good reciprocating movement of the piston 1 as a whole.

[0109] The above structure is a flow-limiting and flow-guiding structure of the second gas ring groove of the piston for the descending air, mixture or gas and oil, and is also a flow-limiting and flow-guiding structure for the ascending air and oil, and the same path is also a circulation and updating structure of the oil being limited and guided to ascend and descend.

[0110] When the piston 1 descends during the suction stroke, the oil sprayed and injected by the crankcase through the oil nozzle enters the oil ring cavity 43 from the oil return hole 44, then enters the recessed ring bank 3 from the port of the combined oil ring upper scraping piece 41 (or the upper port of the integrated oil ring), and then enters the gas ring groove two 25 through the quantitative air outlet hole two 34, and at the same time, enters the ring bank 2 and the bottom of the gas ring groove one 24 through the quantitative air inlet hole two 33 or the air inlet hole two 36, completing the oil return circulation process. The oil accumulated in the oil ring cavity 43, the recessed ring bank 3 and the ring bank 2 is evenly distributed on the working surface of the cylinder wall by the oil ring 23, the gas ring two 22 and the gas ring one 21 together with the movement of the piston 1.

[0111] When the piston 1 enters the working and exhaust strokes, the flow-limiting and flow-guiding structure of the gas ring groove one 24 and the flow-limiting and flow-guiding structure of the gas ring groove two 25 are combined with the existing oil ring groove 26 structure, so that the limited and flow-guided quantitative fuel gas blows through the gas ring groove one 24, the ring bank 2, the gas ring groove two 25, the recessed ring bank 3 and the oil ring cavity 43, and part of the oil is still retained to ensure the lubrication requirement of the piston ring.

[0112] The improved and reconstructed gas ring groove two 25 and the gas ring two 22 are combined with the sealing structure of the gas ring groove one 24 and the gas ring one 21, the oil ring groove 26 and the oil ring 23 to realize the overall use of the piston 1, and the gas tightness is significantly improved, so that more than 90% of the gas is blocked in the upper part of the gas ring groove one 24, 8-10% of the gas is blocked in the upper part of the gas ring groove two 25, and only about 0.01% of the fuel gas can reach the crankcase, so that the piston 1 is highly sealed and well lubricated. The flow-limiting and flow-guiding structure of the gas ring groove two 25 is one of the key structures for driving the oil downward and attracting the oil upward.

[0113] The following table is the measured data of the vehicle when the improved second flow-guiding gas ring groove of the piston is combined with the structure of the gas ring two 22, the sealing structure of the gas ring groove one 24 and the gas ring one 21, the oil ring groove 26 and the oil ring 23 to realize the overall use of the piston 1.

[0114]

[0115] The above table is the emission detection data of the vehicle using gasoline as fuel before and after the vehicle adopts the piston ring groove structure of the patent.

[0116] As shown in the above table, after the vehicle one is modified to use the second flow-guiding gas ring groove structure of the piston of the patent, the HC emission of the vehicle one is reduced by 36.67%, and the NO emission is significantly reduced by 93.98%. After the vehicle two is modified to use the second flow-guiding gas ring groove structure of the piston of the patent, the HC emission of the vehicle two is reduced by 56.10%, the CO emission is reduced by 83.87%, and the NO emission is not significantly increased, which is within the acceptable range of detection error. The emissions of the two vehicles are still significantly lower than the limit requirements of the national six b. Therefore, the second flow-guiding gas ring groove structure of the piston of the patent has a significant effect on reducing the exhaust emission.

[0117] The piston ring and the piston ring groove of the patent are used in various forms and structures to realize the selection of different working conditions or vehicle types, and further improve the practicability and applicability of the piston.

[0118] It will be obvious to a person skilled in the art that the application is not limited to the details of the foregoing exemplary embodiments and can be implemented in other concrete forms without departing from the spirit or essential characteristics of the application. The embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the application being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. No reference signs in the claims should be considered as limiting the scope of the claims to the identity of the reference signs therein.

[0119] Furthermore, it should be understood that although the description is made on the basis of the embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A piston second-stage flow-guiding gas ring groove, comprising a piston (1) and a second gas ring (22) and a second gas ring groove (25) disposed on the piston head, wherein the second gas ring (22) is sleeved on the second gas ring groove (25), characterized in that, The second air ring (22) is provided with an elastic opening and remains a fully sealed ring when it is opened in the cylinder. The upper and lower sides of the second air ring groove (25) are respectively provided with a metered air inlet hole (33) or an air inlet (36) and a metered air outlet hole (34) which are connected to the bottom of the second air ring groove (25).

2. The piston second-stage guide ring groove according to claim 1, characterized in that, After the piston (1) is installed in the cylinder, the upper part of the piston (1) is the combustion chamber. The top of the combustion chamber is provided with a valve inlet surface (91) and a valve exhaust surface (92) arranged in relative positions. The position of the top circular surface of the piston (1) perpendicular to the middle of the valve inlet surface (91) is set at 6 o'clock, and the position of the top circular surface of the piston (1) perpendicular to the middle of the valve exhaust surface (92) is set at 0 o'clock. The second quantitative air inlet (33) or the second air inlet (36) and the second quantitative air outlet (34) must be set at the 6 o'clock or 0 o'clock positions on the upper and lower sides of the second ring groove (25).

3. The piston second-stage guide ring groove according to claim 2, characterized in that, The second air ring (22) is a single-layer double-step overlap with a lower outer tangent structure and a fully sealed ring, or a single-layer single-step overlap with a lower outer tangent structure and a fully sealed ring. The second air ring (22) is provided with a lower outer tangent structure (93).

4. The piston second-stage guide ring groove according to claim 3, characterized in that, When the second air ring (22) is a single-layer double-step overlap with a lower outer tangent structure fully sealed ring, Its two open ends are double-step joint one (71) and double-step joint two (72), respectively. The double-step joint one (71) and double-step joint two (72) are complementary structures. The maximum openings of the double-step joint one (71) and double-step joint two (72) are joined at the ends of the joints. The right-angle turn of the short tongue end of the double-step joint one (71) is provided with an inwardly concave arc hole (45).

5. The piston second-stage guide ring groove according to claim 3, characterized in that, When the second gas ring (22) is a single-layer single-step overlap with a lower external tangent structure full sealing ring, a short tongue end is provided in the concave interface end (81) near the back of the ring. The concave interface end (81), the convex tongue overlap end (82) and the short tongue end cooperate to form a semi-enclosed plug-in sealing structure. An inward concave arc hole (45) is provided at the right angle turn where the concave interface end (81) connects with the short tongue end.

6. The piston second-stage guide ring groove according to claim 3, characterized in that, The quantitative air inlet port two (33) and the quantitative air outlet port two (34) are further configured to correspond to the openings of the air ring two (22): When the second gas ring (22) is a single-layer double-step joint with a lower outer tangent structure full-sealing ring, since there are no air holes on the upper and lower sides of the joint axis when the ring body is opened in the cylinder, the upper and lower sides of the second gas ring groove (25) must be provided with a quantitative air inlet hole (33) and a quantitative air outlet hole (34) respectively. When the second gas ring (22) is a single-layer single-step overlap with a lower external tangent structure full-sealing ring, since the second air inlet (36) is formed on the upper side of the overlap when the ring body is opened in the cylinder, the upper side of the second gas ring groove (25) does not need to be provided with a quantitative air inlet hole (33), while the lower side must be provided with a certain amount of air outlet hole (34).

7. The piston second guide ring groove according to claim 6, characterized in that: Above the second gas ring groove (25) is a first gas ring groove (24), and a first gas ring (21) is fitted inside the first gas ring groove (24); below the second gas ring groove (25) is an oil ring groove (26), and an oil ring (23) is fitted inside the oil ring groove (26); there is a ring land (2) between the first gas ring groove (24) and the second gas ring groove (25), and there is a recessed ring land (3) between the second gas ring groove (25) and the oil ring groove (26).

8. The piston second-stage guide ring groove according to claim 7, characterized in that: The bottom of the second gas ring (22) is provided with a ring of lower outer tangent structure (93), and the bottom of the oil ring groove (26) is provided with a number of oil return holes (44) corresponding to the 0 o'clock and 6 o'clock positions of the piston circle.

9. A method for limiting, guiding, and circulating fuel gas and engine oil based on the piston second-stage flow-guiding ring groove as described in claim 8, characterized in that... Including the following: When the piston (1) enters the compression, power and exhaust strokes, a large amount of air, mixture or gas is blocked by the first gas ring, and a small amount of air, mixture or gas goes down to the ring land (2). The air, mixture or gas that reaches the ring land (2) puts pressure on the front of the second gas ring (22). Except for a small amount of air, mixture or gas that leaks downward from the outer circle of the ring body and the cylinder wall and the gap between the ring body and the ring body through the radial wave-like bounce of the second gas ring (22), the remaining part of the air, mixture or gas enters the back of the ring from the upper side gap. Together with another part of the air, mixture or gas, it is introduced into the back of the second gas ring (22) from the metered air inlet port (33) or the air inlet port (36) at the 6 o'clock or 0 o'clock position to jointly build side pressure, and is discharged from the metered air outlet port (34) at the corresponding 6 o'clock or 0 o'clock position into the recessed ring land (3). Air, mixed gas or fuel gas that reaches the recessed ring land (3) enters the oil ring cavity (43) from the scraper (41) port of the combined oil ring or the upper side of the integrated oil ring port, and then leaks into the crankcase through the oil return hole (44); at the same time, the second gas ring (22) applies the oil buffered by the ring land (2) and the recessed ring land (3) downward to the working surface of the cylinder wall. The process of air, air-fuel mixture or fuel gas flowing downwards into the crankcase is also the process of purging and driving the engine oil downwards back into the crankcase.

10. The method for limiting, guiding, and circulating fuel gas and engine oil using the piston second-stage guide ring groove according to claim 9, characterized in that... Also includes: When the piston (1) enters the intake stroke and moves downward, the oil in the crankcase is guided in the opposite direction from the original downward path of air, mixture or fuel gas, so as to realize the circulation and renewal of the oil at the head of the piston (1); the bottom is provided with a ring 22 with a lower outer tangent structure (93), which, when the piston (1) moves upward, simultaneously evenly coats the oil that is guided to the concave ring land (3) and ring land (2) on the working surface of the cylinder wall.

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