Piston second ring with groove on back surface

Abstract

The utility model provides a piston second ring with a groove in the back face, and relates to the field of automobile accessories. The piston second ring with the grooves in the back face comprises a ring body, a plurality of discontinuous grooves are formed in the inner circumferential face of the ring body in the circumferential direction, and at least one first notch communicated with the upper plane of the ring body and the grooves is formed in the inner circumferential face of the ring body. The intermittent grooves are formed in the inner circumferential face of the ring body, so that the space between the inner circumferential face of the ring body and the second ring groove is enlarged, the pressure reduction effect is achieved, and the technical problems that in the prior art, the blow-by amount of an engine is large, and engine oil consumption is high can be solved.

Description

Technical Field

[0001] This utility model relates to the field of automotive parts, and in particular to a piston second ring with a groove on the back. Background Technology

[0002] As core components of an engine, pistons and piston rings face challenges of higher blow-by volume and oil consumption. Ensuring low oil consumption and low blow-by volume during the initial optimization and durability of pistons and piston rings has become an urgent technical problem to be solved.

[0003] Currently, the inner circumferential surface of the second ring on existing pistons is designed as a flat surface. Because the inner circumferential surface is flat, the space formed between the inner circumferential surface and the inner wall of the second ring groove when the second ring is placed in the piston's second ring groove is relatively small. When combustion pressure is generated in the engine combustion chamber, high-pressure gas will enter the space formed by the second ring and the second ring groove along the closed gap of the first ring. When the pressure in this space is high, it can easily lift the first ring, making it difficult for the inner circumferential surface of the first ring to fit snugly against the first ring groove to block gas passage, which is detrimental to controlling blow-by. Similarly, engine oil can easily pass through this space, which is detrimental to controlling oil consumption. In existing technologies, such as JPS5841249A, grooves are cut on the inner side of the ring. This solution has the following problems: the groove runs through the entire circumference of the ring, greatly damaging the ring's rigidity and strength, drastically reducing its lifespan after high-pressure, high-speed operation; blow-by gas can only enter the groove through the gap between the ring and the groove, resulting in an unstable intake position, causing the ring's position relative to the piston to be unstable during operation, compromising sealing performance, and leading to uncertain wear conditions and positions. Utility Model Content

[0004] The purpose of this invention is to provide a second piston ring with a groove on the back side to solve the technical problems of large engine blow-by volume and high oil consumption in the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows:

[0006] This invention provides a second piston ring with a grooved back, comprising a ring body. Multiple discontinuous grooves are formed circumferentially on the inner circumferential surface of the ring body. The inner circumferential surface of the ring body has at least one first notch connecting the upper plane of the ring body and the grooves. The discontinuities in the grooves retain the complete cross-section of the ring, thus ensuring the ring's rigidity and strength. Furthermore, during engine operation, the notch on the groove connects the groove with the space between the first and second rings, allowing blow-by gas to enter the groove of the second ring more quickly and evenly, ensuring the stability of the overall circumferential air pressure.

[0007] Furthermore, the total circumference of the groove accounts for 20% to 90% of the circumference of the ring.

[0008] Furthermore, the central angle corresponding to the groove in the circumferential direction of the ring body is 9° to 162°, and the number of grooves is 2 to 8.

[0009] Furthermore, the groove is formed into a trapezoidal opening by cutting a section radially along the ring body.

[0010] Furthermore, the width of the trapezoidal opening gradually decreases from the center of the ring towards the outer periphery.

[0011] Furthermore, each of the grooves is provided with at least one of the first notches. This ensures that the gas leakage can be uniformly introduced into the grooves of the annulus throughout the entire circumference, thereby stabilizing the air pressure between the first and second rings throughout the entire circumference.

[0012] Furthermore, the inner circumferential surface of the ring body is provided with at least one second notch connecting the lower plane of the ring body and the groove. To further introduce blow-by gas into the crankcase, a second notch is provided on the opposite side of the location of the first notch in the groove.

[0013] Furthermore, to ensure the overall rigidity of the ring, the first notch and the second notch are arc grooves, and are aligned axially with the ring. The depth of the arc groove along the radial direction of the ring is not greater than the depth of the groove on the inner circumferential surface of the ring.

[0014] Furthermore, the arc length of the groove on the side closer to the center of the ring is greater than the arc length on the side farther from the center of the ring.

[0015] Furthermore, in the circumferential direction of the ring, the opening depth at the middle of the groove is greater than the opening depth at both ends of the groove. Since the groove on the ring is used for pressure relief, this design avoids the problem of pressure imbalance caused by excessively rapid pressure relief near the opening of the groove on the ring during piston operation.

[0016] This invention provides a piston second ring with a groove on the back. By setting multiple discontinuous grooves on the inner circumferential surface of the ring body, and setting multiple first notches connecting the upper plane of the ring body to the grooves on the inner circumferential surface of the ring body, the space between the inner circumferential surface of the ring body and the second ring groove is increased, which plays a role in pressure reduction and can effectively reduce engine blow-by and oil consumption. The discontinuous arrangement of the grooves on the ring body partially preserves the complete cross-section of the ring body in the radial direction, thereby ensuring the overall rigidity and strength of the ring.

[0017] The above and other objects, advantages and features of this utility model will become more apparent to those skilled in the art from the following detailed description of specific embodiments of this utility model in conjunction with the accompanying drawings. Attached Figure Description

[0018] The following sections will describe some specific embodiments of the present invention in a detailed manner by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or components. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the second piston ring according to the first embodiment of the present invention;

[0020] Figure 2 for Figure 1 Sectional view along line AA in the middle;

[0021] Figure 3 This is a schematic diagram of the structure of the piston second ring and piston in the first embodiment of the present invention;

[0022] Figure 4 This is a perspective view of the second piston ring according to the second embodiment of the present invention;

[0023] Figure 5 This is a front view of the second piston ring according to the second embodiment of the present invention;

[0024] Figure 6 for Figure 5 BB-direction sectional view.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Ring body; 2. Arc groove; 3. First notch; 4. Second notch; 5. Piston; 6. Second ring groove; 7. Cylinder bore surface. Detailed Implementation

[0027] In the description of this embodiment, it should be understood that the terms "length", "width", "height", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0028] As a specific embodiment of this utility model, such as Figure 1 , Figure 2 As shown, this utility model provides a piston second ring with a groove on the back, including a ring body 1. Multiple discontinuous grooves 2 are formed on the inner circumferential surface of the ring body 1 along the circumferential direction. The inner circumferential surface of the ring body 1 is provided with at least one first notch 3 that connects the upper plane of the ring body 1 and the grooves 2.

[0029] In other words, the second piston ring with a groove on the back side of this embodiment of the invention forms a space by setting multiple intermittent grooves 2 along the circumferential direction on the inner circumferential surface of the ring body 1, while the discontinuities between the multiple grooves 2 retain a complete cross-section of the ring body 1, thereby ensuring the rigidity and strength of the ring body. Furthermore, one or more first notches 3 are provided on the inner circumferential surface of the ring body 1 to connect the upper plane of the ring body 1 and the space within the grooves 2, thus connecting the space where the upper plane of the ring body 1 is located with the space within the grooves 2.

[0030] As an example, such as Figure 3 As shown, the ring 1 is located within the second ring groove 6 of the piston 5, between the cylinder bore surface 7 and the piston 5. The groove 2 formed on the inner circumferential surface of the ring 1 increases the space between the inner circumferential surface of the ring 1 and the second ring groove 6. The first notch 3 on the groove 2 connects the space between the groove 2 and the space between the ring 1 (the second ring of the piston) and the first ring of the piston 5. When high-pressure gas is generated in the combustion chamber of the engine, this high-pressure gas can enter the space between the ring 1 and the second ring groove 6 along the closed gap of the first ring above the ring 1. The increased space can act as a pressure relief chamber, and the first notch 3 allows the high-pressure gas to enter the second ring groove 6 more quickly and evenly, preventing the high-pressure gas from rising and lifting the first ring of the piston, ensuring the stability of the circumferential air pressure, and ensuring that the first ring of the piston fits snugly with the piston ring groove to form a blocked blow-by channel, effectively reducing the amount of blow-by gas in the engine. Similarly, it can effectively reduce engine oil consumption.

[0031] Preferably, the total circumference of the groove 2 accounts for 20% to 90% of the circumference of the ring 1.

[0032] This not only increases the space between the inner circumferential surface of the ring body 1 and the ring groove, but also ensures that the ring body 1 does not lose its mechanical strength and improves the service life of the ring body 1.

[0033] Preferably, the central angle of the groove 2 on the circumference of the ring body 1 is 9° to 162°, and the number of grooves 2 is 2 to 8.

[0034] In some embodiments, such as Figure 2 As shown, the groove 2 is cut radially along the ring 1 to form a trapezoidal opening. Preferably, the width of the trapezoidal opening gradually decreases from the center of the ring 1 toward the outer periphery.

[0035] Therefore, while increasing the space between the inner circumferential surface of the ring 1 and the ring, the mechanical strength of the ring 1 corresponding to the groove 2 part can be guaranteed.

[0036] In some embodiments, at least one first notch 3 is provided on each slot 2.

[0037] In other words, one or more first notches 3 are provided on each groove 2 to ensure that the space between the groove 2 and the upper plane of the ring body 1 is connected, so that the gas can be uniformly introduced into the groove 2 of the ring body 1 in the entire circumferential direction, thereby stabilizing the gas pressure between the first ring and the second ring in the piston in the entire circumferential direction.

[0038] In some embodiments, such as Figure 4 As shown, the inner circumferential surface of the ring 1 is provided with at least one second notch 4 connecting the lower plane of the ring 1 and the groove 2. The second notch 4 can be vertically aligned with the first notch 3, or they can be staggered. The number of notches can be flexibly set according to the venting requirements while ensuring the overall rigidity of the ring.

[0039] In other words, the inner circumferential surface of the ring body 1 is also provided with a second notch 4 corresponding to the first notch 3, which connects the lower plane of the ring body 1 and the groove 2. The second notch 4 facilitates the downward exhaust of the gas in the groove 2 (specifically, the downward exhaust of the piston is introduced into the crankcase), further ensuring the stability of the gas pressure in the piston.

[0040] In some embodiments, the first notch 3 and the second notch 4 are arc grooves and are aligned axially on the ring body 1. This arrangement ensures the overall rigidity of the ring body 1. Preferably, the depth of the arc groove along the radial direction of the ring body 1 is not greater than the depth of the groove 2 on the inner circumferential surface of the ring body 1.

[0041] As an example, such as Figure 4 , Figure 5 and Figure 6 As shown, with the opening direction of the closed opening of the ring body 1 as the axis of symmetry, three slots 2 are provided at intervals on both sides of the axis of symmetry (i.e., a total of 6 slots 2 are provided). Each slot 2 is provided with a first notch 3 and a second notch 4 that penetrate the upper and lower planes of the ring body 1.

[0042] In some embodiments, the arc length of the groove 2 on the side closer to the center of the ring 1 is greater than the arc length on the side farther from the center of the ring 1.

[0043] In other words, the opening width of the arc groove 2 facing the center of the ring body 1 (i.e. along the direction of the flat surfaces of the upper and lower sides of the ring body 1) gradually decreases from the middle of the arc groove 2 to the two sides along the circumference of the ring body 1, so that the arc length of the side of the groove 2 closer to the center of the ring body 1 is greater than the arc length of the side farther from the center of the ring body 1. This design can further ensure the strength of the ring body 1.

[0044] In some embodiments, in the circumferential direction of the ring body 1, the opening depth at the middle of the groove 2 is greater than the opening depth at both ends of the groove 2.

[0045] In other words, the opening depth of groove 2 (i.e., along the radial direction of ring 1) gradually decreases from the middle of the arc-shaped groove 2 to both sides along the circumference of ring 1, which can further ensure the strength of ring 1. In addition, since groove 2 on ring 1 is used for pressure relief, this design can avoid the problem of pressure imbalance caused by excessively rapid pressure relief near the opening of groove 2 on ring 1 during piston operation.

[0046] Therefore, those skilled in the art should recognize that although many exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A back fluted piston second land ring characterized by, The ring body has an inner circumferential surface with a plurality of discontinuous grooves formed in the circumferential direction, and the inner circumferential surface is provided with at least one first notch communicating with the upper surface of the ring body and the groove.

2. The back-banded pitted piston second land ring of claim 1 wherein, The total length of the grooves accounts for 20% to 90% of the circumference of the ring body.

3. The back-banded pitted piston second land ring of claim 1 wherein, The central angle of the grooves in the circumferential direction of the ring body is 9° to 162°, and the number of the grooves is 2 to 8.

4. The back-banded piste second land ring of claim 1 wherein, The cross section of the groove cut in the radial direction of the ring body is formed into a trapezoidal opening.

5. The back-banded piste second land ring of claim 4 wherein, The width of the trapezoidal opening gradually decreases from the center of the ring body to the outer periphery.

6. The back-grooved piston second land ring of claim 5 wherein, At least one first notch is arranged on each groove.

7. The back-grooved piston second land ring of claim 6 wherein, The inner circumferential surface of the ring body is provided with at least one second notch communicating with the lower surface of the ring body and the groove.

8. The back-banded piste second land ring of claim 7, wherein, The first notch and the second notch are circular arc grooves and are aligned in the axial direction of the ring body.

9. The back-banded piste second land ring of claim 8, wherein, The arc length of the groove near the center of the ring body is greater than the arc length away from the center of the ring body.

10. The back-banded piste second land ring of claim 9, wherein, In the circumferential direction of the ring body, the opening depth of the middle of the groove is greater than the opening depth of the two ends of the groove.

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