Piston second land ring with inboard concave nose hook and internal combustion engine
Patent Information
- Application Number
- CN202522063759.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-25
- Publication Date
- 2026-09-08
- Estimated Expiration
- 2035-09-25
AI Technical Summary
在现有技术的内燃机中，由于活塞环的尺寸限制，为了不影响活塞第二道环的强度，储油环槽的尺寸被设计的较小，储油空间有限
[0014] The embodiments provided in this application provide an oil storage ring groove on the bottom surface of the ring body, and set the minimum radius of the oil storage ring groove to be smaller than the maximum radius of the bottom surface of the ring body, so that the oil storage ring groove expands into the interior of the ring body, thereby increasing the width of the oil storage ring groove in the radial direction of the ring body and thus increasing the oil storage space of the oil storage ring groove.
Smart Images
Figure CN224729655U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of internal combustion engines, and in particular to a piston second ring with a concave nose hook and an internal combustion engine. Background Technology
[0002] In internal combustion engine technology, the piston has three piston rings on its sidewalls. The second piston ring is the middle one. As the piston moves downwards, the second piston ring scrapes off the oil adhering to the cylinder wall. Typically, the bottom surface of the second piston ring has an oil reservoir groove to store the scraped oil. In existing internal combustion engines, due to piston ring size limitations, the oil reservoir groove is designed to be relatively small to avoid affecting the strength of the second piston ring, resulting in limited oil storage space. Although many existing technologies use an arc-shaped oil reservoir to guide oil back from the reservoir, this design requires sophisticated manufacturing processes, and the small size or even sharp corners at the junction of the oil reservoir and the bottom surface of the second piston ring make it prone to damage and folding, affecting oil scraping and storage performance. Utility Model Content
[0003] In response, this application proposes a piston second ring with a concave nose hook, which can increase the oil storage space of the oil reservoir groove.
[0004] On one hand, this application provides a second piston ring for an internal combustion engine; it includes a ring body; the bottom surface of the ring body is provided with an oil reservoir groove; the cross-sectional edge of the oil reservoir groove is composed of multiple straight segments, the minimum radius of the oil reservoir groove is smaller than the maximum radius of the bottom surface of the ring body; the bottom surface of the ring body is not connected to the bottom wall of the oil reservoir groove.
[0005] Optionally, the ratio of the difference between the maximum radius of the ring body and the minimum radius of the oil storage ring groove along the radial direction of the ring body to the width of the ring body falls within the range of 10% to 60%.
[0006] Optionally, the ratio of the difference between the maximum radius of the bottom surface of the ring body and the minimum radius of the oil storage ring groove, along the radial direction of the ring body, to the width of the bottom surface of the ring body, falls within the range of 10% to 50%.
[0007] Optionally, the oil storage ring groove has a first extension; the lower surface of the first extension forms part of the bottom surface of the ring body; along the radial direction of the ring body, from the first connecting wall of the first extension to the inner side wall, the thickness of the first extension gradually increases in the axial direction of the ring body.
[0008] Optionally, the angle between the bottom wall of the first extension and the bottom surface of the ring body is in the range of 10° to 80°.
[0009] Optionally, the oil storage ring groove has a first extension; the lower surface of the first extension forms the bottom surface of part of the ring body; the first connecting wall of the first extension has a thickness greater than zero along the axial direction of the ring body.
[0010] Optionally, along the axial direction of the ring body, the thickness of the top wall of the oil storage ring groove is less than the height of the outer ring surface of the ring body; along the axial direction of the ring body, the ratio of the depth of the oil storage ring groove to the height of the ring body falls within the range of 10% to 60%.
[0011] Optionally, the oil storage ring groove has a second extension; the outer surface of the second extension forms the outer ring surface of part of the ring body; along the axial direction of the ring body, from the second connecting wall of the second extension to the upper side wall, the thickness of the second extension gradually increases in the axial direction of the ring body.
[0012] Optionally, the second connecting wall of the second extension has a thickness greater than zero along the radial direction of the ring body.
[0013] On the other hand, this application also provides an internal combustion engine, including the aforementioned second piston ring.
[0014] The embodiments provided in this application provide an oil storage ring groove on the bottom surface of the ring body, and set the minimum radius of the oil storage ring groove to be smaller than the maximum radius of the bottom surface of the ring body, so that the oil storage ring groove expands into the interior of the ring body, thereby increasing the width of the oil storage ring groove in the radial direction of the ring body and thus increasing the oil storage space of the oil storage ring groove. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the structure of the second ring of the piston provided in one embodiment of this application.
[0016] Figure 2 for Figure 1 A schematic diagram of the cross-section of the second ring of the piston.
[0017] Figure 3 for Figure 1 A schematic diagram of the dimensions of the second ring of the piston.
[0018] Figure 4 for Figure 1 A schematic diagram showing the position of the second piston ring in an internal combustion engine.
[0019] Explanation of reference numerals in the attached figures
[0020] 100. Ring body; 110. Oil reservoir ring groove; 111. Bottom surface; 112. Outer ring surface; 120. First extension; 121. Bottom wall; 122. First connecting wall; 123. Inner side wall; 124. Top wall; 130. Second extension; 131. Side wall; 132. Second connecting wall; 133. Upper side wall; 300. Piston ring groove; 400. Cylinder side wall. Detailed Implementation
[0021] To make the technical solution and beneficial effects of this application more apparent and understandable, a detailed description is provided below by listing specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features; unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application pertains.
[0022] Researchers have found that the second piston ring is typically located within the piston ring groove of an internal combustion engine piston, with its bottom surface in contact with the groove surface. In some internal combustion engines, an oil reservoir groove is incorporated into the bottom surface of the second piston ring to store scraped oil, which reduces the bottom surface area of the second piston ring. This reduced bottom surface area leads to a corresponding decrease in the contact area between the second piston ring and the groove, increasing the contact pressure and thus intensifying wear between the second piston ring and the groove. Therefore, to reduce wear, these internal combustion engines often use smaller oil reservoir grooves, but this results in limited oil storage space within the groove.
[0023] Based on this, researchers proposed a piston second ring with a concave nose hook. By setting an oil storage ring groove on the bottom surface of the ring body, and setting the minimum radius of the oil storage ring groove to be smaller than the maximum radius of the bottom surface of the ring body, the oil storage ring groove expands into the interior of the ring body, thereby increasing the radial width of the oil storage ring groove and thus increasing the oil storage space of the oil storage ring groove.
[0024] refer to Figures 1 to 4 This application provides a second piston ring. The second piston ring is used in an internal combustion engine. The second piston ring includes: a ring body 100, a first extension 120, and a second extension 130. The first extension 120 extends outward from the bottom surface 111 of the ring body 100, and the second extension 130 extends downward from the outer ring surface 112 of the ring body 100, as shown below. Figure 2 As shown, the first extension 120 and the second extension 130 are distinguished from the ring body 100 by dashed lines. The two extensions define an oil reservoir groove 110, meaning that the oil reservoir groove 110 is provided at the intersection of the bottom surface 111 and the outer ring surface 112 of the ring body 100. The oil reservoir groove 110 has a concave nose-hook shape, as shown... Figure 2 As shown, the cross-sectional edge of the oil storage annular groove 110 is composed of multiple straight segments. The minimum radius of the oil storage annular groove 110 is smaller than the maximum radius of the bottom surface 111 of the annular body 100. The bottom surface 111 of the annular body 100 is not connected to the bottom wall 121 of the oil storage annular groove 110. Furthermore, the bottom surface 111 is continuous in the radial direction, meaning that the bottom surface 111 does not extend radially outside the oil storage annular groove 110.
[0025] Understandable Figure 2 This is a schematic cross-sectional view of the piston's second ring. Since the piston's second ring has an axisymmetric structure, its cross-sectional shape is the same at different positions. The minimum radius of the oil reservoir groove 110 refers to the radial distance from the nearest side of the oil reservoir groove 110 to the center of the piston's second ring. The maximum radius of the bottom surface 111 of the ring body 100 refers to the radial distance from the farthest side of the bottom surface 111 of the ring body 100 to the center of the piston's second ring. In this embodiment, the minimum radius of the oil reservoir groove 110 is smaller than the maximum radius of the bottom surface 111 of the ring body 100. This means that the oil reservoir groove 110 can expand inwards into the ring body 100 without reducing the maximum radius of the bottom surface 111 of the ring body 100, thereby increasing the radial width of the oil reservoir groove 110 in the ring body 100. Specifically, expanding inwards into the ring body 100 means that the inner surface of the oil reservoir groove 110 is recessed into the ring body 100.
[0026] Furthermore, it is understood that the cross-sectional edge of the oil storage ring groove 110 is composed of multiple straight segments, meaning that the cross-sectional shape of the oil storage ring groove 110 is composed of multiple straight segments. The bottom wall 121 of the oil storage ring groove 110 refers to the upper surface of the first extension 120. The bottom surface 111 of the ring body 100 is not connected to the bottom wall 121 of the oil storage ring groove 110, indicating that the upper surface of the first extension 120 will not intersect with the bottom surface 111; therefore, the first extension 120 does not have a pointed tip.
[0027] The aforementioned piston second ring has an oil storage ring groove 110 set on the bottom surface of the ring body 100. At the same time, the minimum radius of the oil storage ring groove 110 is set to be smaller than the maximum radius of the bottom surface 111 of the ring body 100, so that the oil storage ring groove can expand into the interior of the ring body, thereby increasing the width of the oil storage ring groove in the radial direction of the ring body and thus increasing the oil storage space of the oil storage ring groove.
[0028] Furthermore, the oil storage space of the oil reservoir 110 is expanded, allowing more oil from the cylinder wall 400 to be stored in the oil reservoir 110, reducing oil residue on the cylinder wall 400, thereby improving the efficiency of oil recovery and reducing oil consumption in the internal combustion engine.
[0029] Furthermore, in this embodiment, the oil storage space of the oil storage ring groove 110 is enlarged without reducing the maximum radius of the bottom surface 111 of the ring body 100. This allows the second piston ring to have a larger bottom surface area to contact the piston ring groove 300, resulting in lower contact surface pressure between the second piston ring and the piston ring groove 300. This avoids increasing wear between the second piston ring and the piston ring groove 300 and extends the service life of the second piston ring and the piston ring groove 300.
[0030] Furthermore, in this embodiment, the first extension 120 does not have a pointed tip. This reduces the risk of breakage or deformation of the first extension of the arc-shaped oil reservoir in the prior art due to the presence of a pointed tip, thereby improving the reliability of the piston's second ring.
[0031] refer to Figures 2 to 3 Optionally, the ratio of the difference X1 between the maximum radius of the ring body 100 and the minimum radius of the oil storage ring groove 110, along the radial direction of the ring body 100, to the width X2 of the ring body 100, falls within the range of 10% to 60%. Here, the difference X1 represents the radial depth of the oil storage ring groove 110. Setting the ratio of the difference X1 to the width X2 of the ring body 100 within the range of 10% to 60% can reduce the risk of the ring body 100 breaking or deforming due to excessive radial depth, thus improving the reliability of the piston's second ring; it also allows the oil storage ring groove 110 to have a larger oil storage space.
[0032] refer to Figure 2 In this embodiment, the cross-sectional edge of the oil storage ring groove 110 is composed of multiple straight segments, which include at least: a bottom wall 121, a first connecting wall 122, an inner side wall 123, a side wall 131, a second connecting wall 132, and an upper side wall 133. The first connecting wall 122 connects the bottom wall 121 and the bottom surface 111. The lower surface of the first extension 120 forms part of the bottom surface 111 of the ring body 100. Along the radial direction of the ring body 100, from the first connecting wall 122 on the bottom surface 111 to the inner side wall 123, the axial thickness of the first extension 120 gradually increases in the axial direction of the ring body 100. This gradual increase in the axial thickness of the first extension 120 enhances its structural rigidity, reduces stress concentration, and thus lowers the risk of breakage or deformation of the first extension 120, thereby improving the reliability of the piston's second ring.
[0033] refer to Figure 2 and Figure 3 Optionally, along the radial direction of the ring body 100, the ratio of the difference X3 between the maximum radius of the bottom surface 111 of the ring body 100 and the minimum radius of the oil storage ring groove 110, to the width X4 of the bottom surface 111 of the ring body 100, falls within the range of 10% to 50%. Here, the difference X3 represents the radial dimension of the first extension 120. Limiting the ratio of the difference X3 to the width X4 of the bottom surface 111 of the ring body 100 to within the range of 10% to 50% reduces the risk of the first extension 120 breaking or deforming due to its excessively large proportion on the bottom surface 111 of the ring body 100, which would otherwise result in low structural rigidity. This improves the reliability of the piston's second ring and allows the oil storage ring groove 110 to have a larger oil storage space.
[0034] refer to Figure 2 Optionally, the angle between the bottom wall 121 of the first extension 120 and the bottom surface 111 of the ring body 100 is in the range of 10° to 80°. The angle between the bottom wall 121 of the first extension 120 and the bottom surface 111 of the ring body 100 can affect the structural stiffness of the first extension 120. When the angle is less than 10°, it indicates that the bottom wall 121 of the first extension 120 is nearly parallel to the bottom surface 111 of the ring body 100. In this case, the stress concentration of the first extension 120 is obvious, the structural stiffness is low, and it is prone to problems such as breakage and deformation of the first extension 120. When the angle is greater than 80° and less than 90°, it indicates that the bottom wall 121 of the first extension 120 is nearly perpendicular to the bottom surface 111 of the ring body 100, which makes it difficult to increase the radial depth of the oil storage ring groove 110. Therefore, limiting the included angle to a range of 10° to 80° can effectively reduce the occurrence of the above problems, thereby improving the reliability of the piston's second ring and allowing the oil reservoir groove 110 to have a larger oil storage space.
[0035] refer to Figure 2 In this embodiment, the thickness of the first connecting wall 122 of the first extension 120 along the axial direction of the ring body 100 is greater than zero. This can improve the structural rigidity of the first connecting wall 122 of the first extension 120, reduce the risk of the first extension 120 breaking or deforming, and thus improve the reliability of the piston's second ring.
[0036] refer to Figures 2 to 4 In this embodiment, along the axial direction of the ring body 100, the thickness Y1 of the top wall 124 of the oil storage ring groove 110 is less than the height Y2 of the outer ring surface 112 of the ring body 100. Optionally, along the axial direction of the ring body 100, the ratio of the depth Y3 of the oil storage ring groove 110 to the height Y4 of the ring body 100 falls within the range of 10% to 60%.
[0037] Specifically, such as Figure 2 As shown, the top wall 124 is part of the ring body 100, and the top wall 124 and the ring body 100 are separated by a dashed line. Figure 4As shown, the outer ring surface 112 of the piston's second ring abuts against the cylinder wall 400. During the actual operation of the internal combustion engine, when the piston's second ring moves downward, the outer ring surface 112 of the piston's second ring scrapes the oil adhering to the cylinder wall 400 using its abutment structure. The contact area between the outer ring surface 112 of the piston's second ring and the cylinder wall 400 affects the oil scraping efficiency; if the contact area is small, the oil scraping efficiency will decrease. In this embodiment, the thickness Y1 of the top wall 124 of the oil reservoir groove 110 is less than the height Y2 of the outer ring surface 112 of the ring body 100. This allows the oil reservoir groove 110 to expand inward into the ring body 100, increasing the axial depth of the oil reservoir groove 110 and thus increasing the oil storage space of the oil reservoir groove 110. At the same time, the increase in the oil storage space does not reduce the height Y2 of the outer ring surface 112 of the ring body 100, thus not affecting the oil scraping efficiency of the piston's second ring.
[0038] Furthermore, refer to Figure 2 and Figure 3 Y3 is the depth of the oil storage ring groove 110. The ratio of the depth Y3 to the height Y4 of the ring body 100 is limited to the range of 10% to 60%. This can reduce the risk of the ring body 100 breaking or deforming due to excessive depth of the oil storage ring groove 110, thereby improving the reliability of the ring body 100. It can also make the oil storage ring groove 110 have a larger oil storage space.
[0039] refer to Figure 2 In this embodiment, the oil reservoir groove 110 has a second extension 130. The outer surface of the second extension 130 forms part of the outer ring surface 112 of the ring body 100. Along the axial direction of the ring body 100, from the second connecting wall 132 to the upper sidewall 133 of the second extension 130, the radial width of the second extension 130 gradually increases in the ring body 100. The sidewall 131 refers to the inner surface of the second extension 130, and the sidewall 131 is connected to the outer ring surface 112 via the second connecting wall 122. The gradual increase in the radial width of the second extension 130 in the ring body 100 enhances the structural rigidity of the second extension 130, reduces stress concentration, and lowers the risk of breakage or deformation of the second extension 130, thereby improving the reliability of the piston's second ring.
[0040] refer to Figure 2 In this embodiment, the width of the second connecting wall 132 of the second extension 130 in the radial direction of the ring body 100 is greater than zero. This means that the inner surface of the second extension 130 will not intersect with the outer ring surface 112, so the second extension 130 does not have a tip, thereby reducing the risk of the second extension 130 breaking or deforming and improving the reliability of the piston's second ring.
[0041] refer to Figure 2 and Figure 3Optionally, along the axial direction of the ring body 100, the ratio of the difference Y5 between the height Y2 of the outer ring surface 112 of the ring body 100 and the thickness Y1 of the top wall 124 of the oil storage ring groove 110, and the height Y2 of the outer ring surface 112 of the ring body 100, falls within the range of 10% to 50%. Here, the difference Y5 represents the axial dimension of the second extension 130. Limiting the ratio of the difference Y5 to the height Y2 within the range of 10% to 50% reduces the risk of the second extension 130 breaking or deforming due to excessively large proportion of its outer surface on the outer ring surface 112 of the ring body 100, which could lead to insufficient structural rigidity. This improves the reliability of the piston's second ring and allows the oil storage ring groove 110 to have a larger oil storage space.
[0042] One embodiment of this application also provides an internal combustion engine. The internal combustion engine includes the aforementioned second piston ring. In the aforementioned internal combustion engine, by providing an oil reservoir groove on the bottom surface of the ring body of the second piston ring, and setting the minimum radius of the oil reservoir groove to be smaller than the maximum radius of the bottom surface of the ring body, the oil reservoir groove can increase its radial width, thereby increasing the oil storage space of the oil reservoir groove.
[0043] In this application, the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "height," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. In other words, they should not be construed as limitations on this application.
[0044] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating the relative importance of the indicated features or the number of indicated technical features. Therefore, a feature specified as "first" or "second" may explicitly include at least one of those features. In this application, "multiple" means at least two, such as two, three, etc.; "several" means at least one, such as one, two, three, etc., unless otherwise explicitly specified.
[0045] In this application, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0046] In this application, unless otherwise expressly defined, the terms "above," "on top of," "over," "above," "below," "below," "below," or "below" for "first feature over second feature" can refer to the first and second features being in direct contact, or to the first and second features being in indirect contact through an intermediate medium. Furthermore, "above," "over," and "below" for "first feature over second feature" can mean the first feature is directly above or diagonally above the second feature, or simply indicates that the horizontal height of the first feature is higher than the horizontal height of the second feature. Similarly, "below," "below," and "below" for "first feature over second feature" can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the horizontal height of the first feature is lower than the horizontal height of the second feature.
[0047] It should be understood that the above embodiments are exemplary and are not intended to include all possible embodiments covered by the claims. Various modifications and changes can be made to the above embodiments without departing from the scope of this disclosure. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several embodiments of this application and do not limit the scope of protection of this patent application.
Claims
1. A second ring of a piston for an internal combustion engine; characterized by, The ring body has an oil storage groove on the bottom surface, and the bottom surface is continuous in the radial direction; The cross section edge of the oil storage groove is composed of multiple straight line segments, and the minimum radius of the oil storage groove is smaller than the maximum radius of the bottom surface of the ring body; The bottom surface of the ring body is not connected to the bottom wall of the oil storage groove.
2. The second land ring of a piston of claim 1 wherein, The difference between the maximum radius of the ring body and the minimum radius of the oil storage groove in the radial direction of the ring body is within 10% to 60% of the width of the ring body.
3. The second land ring of a piston of claim 1 wherein, The difference between the maximum radius of the bottom surface of the ring body and the minimum radius of the oil storage groove in the radial direction of the ring body is within 10% to 50% of the width of the bottom surface of the ring body.
4. The second land ring of a piston of claim 1 wherein, The oil storage groove has a first extension; the lower surface of the first extension forms part of the bottom surface of the ring body; and the thickness of the first extension in the axial direction of the ring body gradually increases from the first connecting wall to the inner side wall in the radial direction of the ring body.
5. The second land ring of a piston of claim 4 wherein, The angle between the bottom wall of the first extension and the bottom surface of the ring body is within 10° to 80°.
6. The second land ring of a piston of claim 1 wherein, The oil storage groove has a first extension; the lower surface of the first extension forms part of the bottom surface of the ring body; and the thickness of the first connecting wall of the first extension in the axial direction of the ring body is greater than zero.
7. The second-ring piston of claim 1 wherein, The thickness of the top wall of the oil storage groove in the axial direction of the ring body is smaller than the height of the outer ring surface of the ring body. The ratio of the depth of the oil storage groove to the height of the ring body in the axial direction of the ring body is within 10% to 60%.
8. The second-ring piston of any one of claims 1 to 7, wherein, The oil storage groove has a second extension; the outer surface of the second extension forms part of the outer ring surface of the ring body; and the thickness of the second extension in the axial direction of the ring body gradually increases from the second connecting wall to the upper side wall.
9. The second land ring of a piston of claim 8 wherein, The thickness of the second connecting wall of the second extension in the radial direction of the ring body is greater than zero.
10. An internal combustion engine characterized by comprising: The piston second ring comprises the piston second ring according to any one of claims 1 to 9.