Matching structure of piston ring and piston for internal combustion engine
By designing the matching structure between the long-neck piston ring and the piston ring groove, the problems of excessive air leakage and piston ring flutter in traditional designs are solved, and higher sealing and vibration resistance are achieved.
Patent Information
- Application Number
- CN202422322254.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-24
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-09-24
AI Technical Summary
The design of piston rings and piston ring grooves in traditional internal combustion engines leads to excessive air leakage, affecting engine performance, and the friction and wear between the piston rings and pistons is intensified.
A mating structure for piston ring and piston for internal combustion engines is designed. The cross-section of the piston ring and piston ring groove is designed to be long-necked, similar to the shape of a beer bottle, adding curved structure to form a throttling effect, and increasing the radial thickness of the piston ring to enhance anti-vibration stiffness.
By increasing the curved structure, the air leakage between the piston ring and the piston ring groove is reduced, and the sealing property is improved. At the same time, the enhanced anti-vibration stiffness reduces the occurrence of piston ring flutter, further improving the sealing property.
Smart Images
Figure CN222976920U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of internal combustion engine accessories, and more specifically, it especially belongs to a matching structure between a piston ring and a piston for an internal combustion engine. Background Art
[0002] During the combustion process of an internal combustion engine, high-pressure gas is generated. The gas leaks into the crankcase of the internal combustion engine through the gap between the piston ring and the piston ring groove, the opening gap of the piston ring, and the gap between the piston ring and the cylinder liner. The gap between the piston ring and the piston ring groove is the main channel for gas leakage. Among them, the side gap between the piston ring and the piston ring groove has a greater impact on the air leakage volume than the back gap between the piston ring and the piston ring groove.
[0003] When the air leakage exceeds the critical value, it will cause difficulties in starting the engine, a decrease in power, an increase in fuel and oil consumption, an increase in emitted pollutants, the destruction of the oil film between the piston ring and the piston, thereby exacerbating the friction and wear between the piston ring and the piston, and the aging and deterioration of the engine oil. Summary of the Invention
[0004] The purpose of the utility model is to overcome the deficiencies of the above-mentioned traditional technologies, and provide a matching structure between a piston ring and a piston for an internal combustion engine, so as to achieve the purpose of improving the sealing performance between the piston ring and the piston ring groove.
[0005] The matching structure between the piston ring and the piston for the internal combustion engine provided by the utility model includes a piston body and a piston ring. A piston ring groove is formed on the piston body. It is characterized in that the piston ring includes a ring running surface, an upper ring side surface, a first ring curved surface, an inner ring side surface, a second ring curved surface, and a lower ring side surface;
[0006] The cross-section of the ring running surface is an arc surface, and the arc cross-section of the ring running surface bends away from the piston body.
[0007] The cross-sections of the upper ring side surface and the lower ring side surface are planes; one end of the cross-sections of the upper ring side surface and the lower ring side surface in the same direction is respectively connected to the upper end and the lower end of the inner arc side of the cross-section of the ring running surface; the upper ring side surface and the lower ring side surface are arranged in parallel;
[0008] The cross-sections of the first ring curved surface and the second ring curved surface are arc surfaces with the same structure; one end of the cross-section of the first ring curved surface is connected to one end of the cross-section of the upper ring side surface away from the cross-section of the ring running surface; one end of the cross-section of the second ring curved surface is connected to one end of the cross-section of the lower ring side surface away from the cross-section of the ring running surface; the arc cross-sections of the first ring curved surface and the second ring curved surface both bend towards the inside of the piston ring;
[0009] The cross-section of the inner side of the ring is a plane; the upper end of the cross-section of the inner side of the ring is connected to one end of the cross-section of the first ring surface away from the cross-section of the upper side of the ring; the lower end of the cross-section of the inner side of the ring is connected to one end of the cross-section of the second ring surface away from the cross-section of the lower side of the ring;
[0010] The center line of the cross-section of the ring running surface and the inner side of the ring lies in the same plane; the cross-sections of the upper side and the lower side of the ring are symmetrically distributed along the center line of the cross-section of the ring running surface and the inner side of the ring; the cross-sections of the first ring surface and the second ring surface of the ring are symmetrically distributed along the center line of the cross-section of the ring running surface and the inner side of the ring;
[0011] The cross-section of the piston ring groove has the same shape as the cross-section of the piston ring, including the upper side of the groove, the first groove surface, the inner side of the groove, the second groove surface and the lower side of the groove;
[0012] One end in the same direction of the upper side and the lower side of the groove are respectively connected to the circumferential side of the piston body; one end of the upper side of the groove away from the circumferential side of the piston body is connected to one end of the first groove surface; one end of the lower side of the groove away from the circumferential side of the piston body is connected to one end of the second groove surface;
[0013] One end of the first groove surface away from the upper side of the groove is connected to the upper end of the inner side of the groove; one end of the second groove surface away from the lower side of the groove is connected to the lower end of the inner side of the groove;
[0014] The upper side and the lower side of the groove are arranged in parallel; the upper side and the lower side of the groove are symmetrically distributed along the center line of the inner side of the groove; the first groove surface and the second groove surface are symmetrically distributed along the center line of the inner side of the groove;
[0015] The piston ring is arranged in the piston ring groove; the ring running surface is located outside the piston ring groove; the upper side of the ring cooperates with the upper side of the groove; the first ring surface cooperates with the first groove surface; the inner side of the ring cooperates with the inner side of the groove; the second ring surface cooperates with the second groove surface; the lower side of the ring cooperates with the lower side of the groove.
[0016] In the piston ring and piston matching structure for an internal combustion engine provided by the present utility model, the end of the cross-section of the piston ring and the piston ring groove close to the inside of the piston body is designed to be a long-neck shape, similar to the shape of a beer bottle. In this solution, on the one hand, since there are two curved surfaces in this shape, there are two curved leakage passage paths formed by the leakage passage path, resulting in an obvious throttling effect and reducing the leakage amount through this gap; on the other hand, compared with the design of the traditional rectangular piston ring and piston ring groove, in this solution, without an obvious increase in weight, the radial thickness of the piston ring is increased, thereby improving the radial vibration stiffness resistance of the piston ring. Therefore, the suspension times of the piston during operation can be reduced, effectively delaying or even avoiding the occurrence of piston ring chatter, and improving the sealing performance between the piston ring and the piston ring groove.
[0017] As can be seen from the above, compared with the design of the traditional rectangular piston ring and piston ring groove, the utility model effectively reduces the air leakage between the piston ring and the piston ring groove, and improves the sealing performance between the piston ring and the piston ring groove. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 is a schematic structural diagram of a traditional rectangular piston ring and piston ring groove;
[0019] Figure 2 is a schematic structural diagram of the utility model.
[0020] In the figure, the corresponding relationship between the component names and the drawing reference numerals is as follows:
[0021] 1, piston body; 2, piston ring; 21, ring running surface; 22, upper side surface of the ring; 23, first curved surface of the ring; 24, inner side surface of the ring; 25, second curved surface of the ring; 26, lower side surface of the ring; 3, piston ring groove; 31, upper side surface of the groove; 32, first curved surface of the groove; 33, inner side surface of the groove; 34, second curved surface of the groove; 35, lower side surface of the groove; 4, cylinder liner; A - B, air leakage channel. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present utility model.
[0023] In the description of the present utility model, unless otherwise specified, "a plurality of" means two or more; the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.
[0024] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "connected" and "connected to" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.
[0025] The present utility model provides a matching structure between a piston ring and a piston for an internal combustion engine, which is mainly applied to the first compression ring of the internal combustion engine and the first ring groove of the piston, so that the piston ring and the piston ring groove cooperate with each other to achieve a better sealing effect, including a piston body 1 and a piston ring 2.
[0026] The piston ring 2 includes a ring running surface 21, an upper ring surface 22, a first ring curved surface 23, an inner ring surface 24, a second ring curved surface 25, and a lower ring surface 26.
[0027] The cross-section of the ring running surface 21 is an arc surface, and the arc cross-section of the ring running surface 21 bends away from the piston body 1.
[0028] The cross-sections of the upper ring surface 22 and the lower ring surface 26 are planes. One end of the cross-sections of the upper ring surface 22 and the lower ring surface 26 in the same direction is respectively connected to the upper end and the lower end of the inner arc side of the cross-section of the ring running surface 21. The upper ring surface 22 and the lower ring surface 26 are arranged in parallel.
[0029] The cross-sections of the first ring curved surface 23 and the second ring curved surface 25 are arc surfaces with the same structure. One end of the cross-section of the first ring curved surface 23 is connected to one end of the cross-section of the upper ring surface 22 away from the cross-section of the ring running surface 21. One end of the cross-section of the second ring curved surface 25 is connected to one end of the cross-section of the lower ring surface 26 away from the cross-section of the ring running surface 21. The arc cross-sections of the first ring curved surface 23 and the second ring curved surface 25 both bend towards the inside of the piston ring 2.
[0030] The cross-section of the inner ring surface 24 is a plane. The upper end of the cross-section of the inner ring surface 24 is connected to one end of the cross-section of the first ring curved surface 23 away from the cross-section of the upper ring surface 22. The lower end of the cross-section of the inner ring surface 24 is connected to one end of the cross-section of the second ring curved surface 25 away from the cross-section of the lower ring surface 26.
[0031] The center lines of the cross-sections of the ring running surface 21 and the inner ring surface 24 are located in the same plane. The cross-sections of the upper ring surface 22 and the lower ring surface 26 are symmetrically distributed along the center lines of the cross-sections of the ring running surface 21 and the inner ring surface 24. The cross-sections of the first ring curved surface 23 and the second ring curved surface 25 are symmetrically distributed along the center lines of the cross-sections of the ring running surface 21 and the inner ring surface 24.
[0032] A piston ring groove 3 which mates with a piston ring 2 is formed in a piston body 1. The cross-section of the piston ring groove 3 has the same shape as that of the piston ring 2, including an upper groove side surface 31, a first groove curved surface 32, an inner groove side surface 33, a second groove curved surface 34, and a lower groove side surface 35.
[0033] One end in the same direction of the upper groove side surface 31 and the lower groove side surface 35 are respectively connected to the circumferential side of the piston body 1. One end of the upper groove side surface 31 away from the circumferential side of the piston body 1 is connected to one end of the first groove curved surface 32. One end of the lower groove side surface 35 away from the circumferential side of the piston body 1 is connected to one end of the second groove curved surface 34.
[0034] One end of the first groove curved surface 32 away from the upper groove side surface 31 is connected to the upper end of the inner groove side surface 33. One end of the second groove curved surface 34 away from the lower groove side surface 35 is connected to the lower end of the inner groove side surface 33.
[0035] The upper groove side surface 31 and the lower groove side surface 35 are arranged in parallel. The upper groove side surface 31 and the lower groove side surface 35 are symmetrically distributed along the center line of the inner groove side surface 33. The first groove curved surface 32 and the second groove curved surface 34 are symmetrically distributed along the center line of the inner groove side surface 33.
[0036] The piston ring 2 is arranged in the piston ring groove 3. A ring running surface 21 is located outside the piston ring groove 3. The upper ring side surface 22 mates with the upper groove side surface 31 and contacts each other during the operation of the engine. The first ring curved surface 23 mates with the first groove curved surface 32. The inner ring side surface 24 mates with the inner groove side surface 33. The second ring curved surface 25 mates with the second groove curved surface 34. The lower ring side surface 26 mates with the lower groove side surface 35 and contacts each other during the operation of the engine.
[0037] As can be seen from the above, the end of the cross-section of the piston ring 2 and the piston ring groove 3 close to the inside of the piston body 1 is designed to be a long-neck shape, similar to the shape of a beer bottle. In this solution, on the one hand, since there are two curved surfaces in this shape, there are two curved path leakage channels A - B, resulting in an obvious throttling effect and reducing the leakage volume through this gap; on the other hand, compared with the traditional design of rectangular piston rings and piston ring grooves, in the case where the weight increase is not obvious, the radial thickness of the piston ring 2 is increased, thereby improving the radial vibration stiffness of the piston ring 2. Therefore, the suspension times of the piston during operation can be reduced, effectively delaying or even avoiding the occurrence of piston ring 2 flutter, and improving the sealing performance between the piston ring 2 and the piston ring groove 3.
[0038] In summary, compared with the traditional design of rectangular piston rings and piston ring grooves, the utility model effectively reduces the leakage volume between the piston ring and the piston ring groove, and improves the sealing performance between the piston ring and the piston ring groove.
Claims
1. A matching structure of a piston ring and a piston for an internal combustion engine, comprising a piston body (1) and a piston ring (2), wherein a piston ring groove (3) is provided on the piston body (1), and wherein: The piston ring (2) comprises a ring running surface (21), a ring upper side surface (22), a ring first curved surface (23), a ring inner side surface (24), a ring second curved surface (25) and a ring lower side surface (26); The cross section of the ring running surface (21) is an arc surface, and the arc cross section of the ring running surface (21) is curved toward a side away from the piston body (1); The cross-sections of the upper side surface (22) and the lower side surface (26) of the ring are planes; one end of the cross-sections of the upper side surface (22) and the lower side surface (26) in the same direction are respectively connected to the upper end and the lower end of the inner arc side of the cross-section of the ring running surface (21); the upper side surface (22) and the lower side surface (26) of the ring are arranged in parallel; The cross sections of the first curved surface (23) and the second curved surface (25) of the ring are arc surfaces with the same structure; one end of the cross section of the first curved surface (23) of the ring is connected to one end of the cross section of the upper side surface (22) of the ring away from the cross section of the ring running surface (21); one end of the cross section of the second curved surface (25) of the ring is connected to one end of the cross section of the lower side surface (26) of the ring away from the cross section of the ring running surface (21); the arc cross sections of the first curved surface (23) and the second curved surface (25) of the ring are both curved toward the inside of the piston ring (2); The cross section of the inner side surface (24) of the ring is a plane; the upper end of the cross section of the inner side surface (24) of the ring is connected to an end of the cross section of the first curved surface (23) of the ring away from the cross section of the upper side surface (22) of the ring; the lower end of the cross section of the inner side surface (24) of the ring is connected to an end of the cross section of the second curved surface (25) of the ring away from the cross section of the lower side surface (26) of the ring; The cross-sectional center lines of the ring running surface (21) and the ring inner side surface (24) are located in the same plane; the cross-sectional views of the ring upper side surface (22) and the ring lower side surface (26) are symmetrically distributed along the cross-sectional center lines of the ring running surface (21) and the ring inner side surface (24); the cross-sectional views of the ring first curved surface (23) and the ring second curved surface (25) are symmetrically distributed along the cross-sectional center lines of the ring running surface (21) and the ring inner side surface (24); The cross section of the piston ring groove (3) is in the same shape as the cross section of the piston ring (2), comprising an upper groove side surface (31), a first groove curved surface (32), an inner groove side surface (33), a second groove curved surface (34) and a lower groove side surface (35); One end of the groove upper side surface (31) and the groove lower side surface (35) in the same direction are respectively connected to the circumference of the piston body (1); one end of the groove upper side surface (31) away from the circumference of the piston body (1) is connected to one end of the groove first curved surface (32); and one end of the groove lower side surface (35) away from the circumference of the piston body (1) is connected to one end of the groove second curved surface (34); One end of the first curved surface (32) of the groove away from the upper side surface (31) of the groove is connected to the upper end of the inner side surface (33) of the groove; one end of the second curved surface (34) of the groove away from the lower side surface (35) of the groove is connected to the lower end of the inner side surface (33) of the groove; The upper side surface (31) and the lower side surface (35) of the groove are arranged in parallel; the upper side surface (31) and the lower side surface (35) of the groove are symmetrically distributed along the center line of the inner side surface (33) of the groove; the first curved surface (32) and the second curved surface (34) of the groove are symmetrically distributed along the center line of the inner side surface (33) of the groove; The piston ring (2) is arranged in a piston ring groove (3); the ring running surface (21) is located outside the piston ring groove (3); the ring upper side surface (22) cooperates with the groove upper side surface (31); the ring first curved surface (23) cooperates with the groove first curved surface (32); the ring inner side surface (24) cooperates with the groove inner side surface (33); the ring second curved surface (25) cooperates with the groove second curved surface (34); and the ring lower side surface (26) cooperates with the groove lower side surface (35).