Piston ring and engine

Abstract

The piston ring comprises a piston ring first end portion and a piston ring second end portion, and a piston ring opening is formed between the piston ring first end portion and the piston ring second end portion. At least one of the first end of the piston ring and the second end of the piston ring is provided with a piston ring groove, and the groove bottom of the piston ring groove is of a curved surface structure capable of guiding airflow to form vortexes. Air flow entering the piston ring groove flows from the opening side of the piston ring groove to the groove bottom side, and when the air flow flows to the groove bottom side, due to the fact that the groove bottom is of the curved surface structure, under the guiding effect of the groove bottom of the curved surface structure, the air flow can form vortex gas which overflows upwards. The vortex gas returns upwards and impacts the opening of the piston ring to prevent the airflow flowing downwards through the opening of the piston ring, namely, the resistance of the airflow flowing downwards through the opening of the piston ring is increased, so that the sealing effect is improved, and the air leakage is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, and more particularly to a piston ring and an engine. Background Art

[0002] Piston rings are metal rings that fit into the piston grooves. There are two types of piston rings: air rings and oil rings. Air rings seal the combustible mixture within the combustion chamber, while oil rings remove excess oil from the cylinder. Piston rings are widely used in various power machinery, including steam engines, diesel engines, gasoline engines, compressors, and hydraulic presses. They are also widely used in automobiles, trains, ships, and yachts.

[0003] With the continuous update of emission regulations, stricter requirements are being imposed on engine oil consumption and air leakage. As a core engine component, piston rings have a significant impact on both oil consumption and air leakage. Existing piston rings generally use a flat-end closed-end design. This shape allows gas and oil to pass more easily, which has a negative impact on air leakage.

[0004] Therefore, how to improve the sealing effect of the piston ring and reduce the amount of gas leakage is a problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] In view of this, the purpose of the present invention is to provide a piston ring to improve the sealing effect and reduce the amount of gas leakage;

[0006] Another object of the present invention is to provide an engine having the above-mentioned piston ring.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A piston ring comprises a first piston ring end portion and a second piston ring end portion, wherein a piston ring opening is formed between the first piston ring end portion and the second piston ring end portion;

[0009] At least one of the first end portion of the piston ring and the second end portion of the piston ring is provided with a piston ring groove, and a groove bottom of the piston ring groove is a curved surface structure capable of guiding airflow to form a vortex.

[0010] Optionally, in the above-mentioned piston ring, the first end portion of the piston ring is provided with the piston ring groove, the opening side of the piston ring groove passes through one axial end surface of the piston ring, and the first end portion of the piston ring has a notch on a side of the piston ring groove facing the second end portion of the piston ring;

[0011] The second end of the piston ring has a boss extending into the notch.

[0012] Optionally, in the above piston ring, the piston ring groove is a first piston ring groove, and the boss is a first boss;

[0013] The direction of the first piston ring groove from the opening side to the bottom side is the groove extension direction, the angle between the groove extension direction and the axial direction of the piston ring is an acute angle, and the opening side of the first piston ring groove is closer to the second end of the piston ring than the bottom side.

[0014] Optionally, in the above piston ring, the first piston ring groove includes a first semicircular groove bottom and a first groove sidewall connected to the first semicircular groove bottom and away from the second end of the piston ring, and the angle between the first groove sidewall and the axial direction of the piston ring is an acute angle;

[0015] A surface of the first boss facing the side wall of the first groove is a first boss front surface, and the first boss front surface is parallel to the side wall of the first groove.

[0016] Optionally, in the above piston ring, along the extending direction of the groove, the notch extends from the opening side of the first piston ring groove to the side of the first semicircular groove bottom close to the second end of the piston ring;

[0017] The bottom surface of the notch is a notch slope, the surface of the first boss facing the notch slope is the first boss lower surface, the first boss lower surface is parallel to the notch slope, and the angle between the notch slope and the end face of the piston ring is an acute angle.

[0018] Optionally, in the above piston ring, the piston ring groove is a second piston ring groove, and the boss is a second boss;

[0019] The direction of the second piston ring groove from the opening side to the groove bottom side is the groove extension direction, and the groove extension direction is parallel to the axial direction of the piston ring.

[0020] Optionally, in the above piston ring, the second piston ring groove includes a second semicircular groove bottom and a second groove sidewall connected to the second semicircular groove bottom and away from the second end of the piston ring, and the second groove sidewall is parallel to the axial direction of the piston ring;

[0021] A surface of the second boss facing the side wall of the second groove is a second boss front surface, and the second boss front surface is parallel to the side wall of the second groove.

[0022] Optionally, in the above piston ring, along the extending direction of the groove, the notch extends from the opening side of the second piston ring groove to a side of the second semicircular groove bottom close to the second end of the piston ring;

[0023] The bottom surface of the notch is the notch plane, the surface of the second boss facing the notch plane is the second boss lower surface, the second boss lower surface is parallel to the notch plane, and the notch plane is parallel to the end face of the piston ring.

[0024] Optionally, in the above piston ring, both the first end portion of the piston ring and the second end portion of the piston ring are provided with piston ring grooves, the piston ring groove on the first end portion of the piston ring is a third piston ring groove, and the piston ring groove on the second end portion of the piston ring is a fourth piston ring groove;

[0025] The third piston ring groove and the fourth piston ring groove each include at least two spaced apart grooves along the axial direction of the piston ring, and the third piston ring groove and the fourth piston ring groove are symmetrically arranged along the piston ring opening;

[0026] The direction of the third piston ring groove and the fourth piston ring groove from the opening side to the groove bottom side is the groove extension direction, and the angles between the groove extension directions of the third piston ring groove and the axial direction of the piston ring are both acute angles, and the opening side of the third piston ring groove is closer to the second end of the piston ring than the groove bottom side, and the opening side of the fourth piston ring groove is closer to the first end of the piston ring than the groove bottom side.

[0027] The piston ring provided by the present invention has a piston ring groove provided on at least one of its first and second ends, and the bottom of the piston ring groove has a curved surface structure capable of guiding airflow to form a vortex. During piston movement within the cylinder, as airflow from the combustion chamber flows through the piston ring opening between the first and second ends, a portion of the airflow enters the piston ring groove. The airflow entering the piston ring groove flows from the opening side of the piston ring groove toward the groove bottom side. Upon reaching the groove bottom side, due to the curved surface structure of the groove bottom, this portion of the airflow forms an upward-swelling vortex of gas, guided by the curved surface structure. This vortex of gas returns upward and impacts the piston ring opening, blocking the airflow flowing downward through the piston ring opening. This increases the resistance to the airflow flowing downward through the piston ring opening, thereby improving the sealing effect and reducing air leakage.

[0028] An engine comprises a piston, wherein the piston is provided with a piston ring, and the piston ring is the piston ring as described in any one of the above items.

[0029] The engine disclosed in the embodiment of the present utility model has all the technical effects of the above-mentioned piston rings, and thus will not be described in detail herein. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0031] Figure 1 This is a schematic diagram of the partial structure of the piston ring disclosed in the first embodiment of the present utility model;

[0032] Figure 2 This is a schematic diagram of the partial structure of the first end portion of the piston ring disclosed in the first embodiment of the present utility model;

[0033] Figure 3 This is a schematic diagram of the partial structure of the second end portion of the piston ring disclosed in the first embodiment of the present utility model;

[0034] Figure 4 This is a schematic diagram of the partial structure of the piston ring disclosed in the second embodiment of the present utility model;

[0035] Figure 5 This is a schematic diagram of the partial structure of the first end portion of the piston ring disclosed in the second embodiment of the present utility model;

[0036] Figure 6 This is a schematic diagram of the partial structure of the second end portion of the piston ring disclosed in the second embodiment of the present utility model;

[0037] Figure 7 This is a schematic diagram of the partial structure of the piston ring disclosed in the third embodiment of the present utility model;

[0038] Figure 8 This is a vortex diagram of the piston ring disclosed in Example 1 of the present utility model.

[0039] The meanings of the reference numerals in the figures are as follows:

[0040] 100- first end of piston ring; 200- second end of piston ring;

[0041] 110 - first piston ring groove; 111 - first semicircular groove bottom; 112 - first groove sidewall; 113 - notch slope;

[0042] 210 - first boss; 211 - front surface of first boss; 212 - lower surface of first boss;

[0043] 120 - second piston ring groove; 121 - second semicircular groove bottom; 122 - second groove sidewall; 123 - notch plane;

[0044] 220 - second boss; 221 - front surface of second boss; 222 - lower surface of second boss;

[0045] 130-third piston ring groove; 230-fourth piston ring groove. DETAILED DESCRIPTION

[0046] The core of the utility model is to provide a piston ring to improve the sealing effect and reduce the amount of gas leakage;

[0047] Another core of the present invention is to provide an engine having the above-mentioned piston ring.

[0048] The following embodiments are described with reference to the accompanying drawings. The embodiments described below do not limit the scope of the utility model as set forth in the claims. Furthermore, the entire contents of the components described in the following embodiments are not necessarily required to provide the solutions described in the claims. It should be noted that, for ease of description, only the portions relevant to the utility model are shown in the accompanying drawings. The embodiments and features of the embodiments of the present utility model may be combined with one another unless there is a conflict.

[0049] The piston ring opening refers to the gap between the two ends of the piston ring. During assembly, the piston ring is propped open with a special tool and installed into the piston ring groove. Due to the existence of the piston ring opening, the piston ring can still move relatively in the piston ring groove when heated during movement. The piston ring opening is also the main component of the leakage channel.

[0050] The main function of the piston ring is to seal the gas to prevent the gas in the cylinder from leaking into the oil pan. The first ring (the piston ring closest to the combustion chamber) is the most important gas sealing device. Its leakage channel is composed of the piston ring opening of the first ring, the cylinder liner and the area surrounded by the upper edge of the second ring bank. The piston ring will stick to the cylinder wall due to elastic force. When the gas pressure is high, the first ring will stick to the bottom of the piston ring groove. Therefore, the opening of the first ring is the largest leakage channel. If it is not handled properly, the leakage will increase, which will lead to a series of problems such as oil consumption and carbon deposits.

[0051] Based on this, the embodiment of the present utility model discloses a piston ring to improve the sealing effect of the piston ring and reduce the amount of gas leakage. Figure 1 、 Figure 4 and Figure 7 As shown, the piston ring disclosed in the embodiment of the present invention includes a first piston ring end 100 and a second piston ring end 200. That is, the piston ring is generally an unclosed annular structure, and thus has two ends. For the sake of convenience, these two ends are defined as the first piston ring end 100 and the second piston ring end 200.

[0052] A piston ring opening is formed between the first end 100 of the piston ring and the second end 200 of the piston ring, that is, the gap between the first end 100 of the piston ring and the second end 200 of the piston ring forms the piston ring opening; specifically, the width of the piston ring opening can be set by those skilled in the art according to needs, and this embodiment does not limit the width of the piston ring opening.

[0053] At least one of the first piston ring end 100 and the second piston ring end 200 is provided with a piston ring groove, the bottom of which is a curved surface structure capable of guiding the airflow to form a vortex. Figure 1 and Figure 4 In the embodiment shown, the piston ring groove is only provided on the first end portion 100 of the piston ring. Figure 7 In the illustrated embodiment, piston ring grooves are provided on both the first piston ring end 100 and the second piston ring end 200. The piston ring grooves can guide the incoming airflow into vortices, changing the airflow direction, and utilize the airflow entering the piston ring grooves to increase the resistance of the airflow flowing downward from the piston ring opening.

[0054] In summary, the piston ring provided by the present invention has a piston ring groove disposed on at least one of the first end 100 and the second end 200. The bottom of the piston ring groove is a curved surface structure capable of guiding airflow to form vortices. As the piston moves within the cylinder, airflow from the combustion chamber flows through the piston ring opening between the first end 100 and the second end 200, with some of the airflow flowing into the piston ring groove.

[0055] like Figure 8 As shown, air entering the piston ring groove flows from the opening toward the groove bottom. As it reaches the groove bottom, the curved surface of the groove bottom guides this airflow, causing it to change direction, forming an upward swirling gas flow. This swirling gas returns upward and impacts the piston ring opening, blocking the airflow flowing downward through the piston ring opening. This increases the resistance to the airflow flowing downward through the piston ring opening, thereby improving the sealing effect and reducing air leakage.

[0056] like Figure 1 and Figure 4 As shown, in a specific embodiment of the present invention, the piston ring groove is arranged on the first end portion 100 of the piston ring, and the open side of the piston ring groove passes through an axial end face of the piston ring, that is, after the piston ring is installed on the piston, the open side of the piston ring groove should pass through the top of the piston ring, so that after the piston is applied to the combustion chamber, the open side of the piston ring groove is the side facing the combustion chamber, and the airflow generated in the combustion chamber can enter the piston ring groove through the opening of the piston ring groove.

[0057] The first end 100 of the piston ring has a notch on the side of the piston ring groove facing the second end 200. This notch connects the piston ring groove to the piston ring opening. The second end 200 of the piston ring has a boss that extends into the notch. By providing the boss on the second end 200 of the piston ring and partially obscuring the notch, the piston ring opening can be made to present a zigzag structure from one end to the other. In other words, the line connecting one end of the piston ring opening to the other is not parallel to the axis of the piston ring. Airflow entering the piston ring opening from one end must make a detour before exiting from the other end, which undoubtedly increases resistance to airflow and can also reduce air leakage to a certain extent.

[0058] In this embodiment, the piston ring groove can be understood as a part of the piston ring opening. The airflow needs to first flow through the piston ring groove, and then flow through the other parts of the piston ring opening below the piston ring groove (that is, the side away from the combustion chamber when in use) before it can pass through the piston ring.

[0059] For the sake of convenience, the piston ring groove of the piston ring disclosed in the first embodiment of the present invention is defined as the first piston ring groove 110, and the boss is defined as the first boss 210 (such as Figure 1-Figure 3 As shown). The piston ring groove of the piston ring disclosed in the second embodiment of the present invention is defined as the second piston ring groove 120, and the boss is defined as the second boss 220 (as shown). Figure 4-Figure 6 shown).

[0060] like Figure 1-Figure 3 As shown, the direction from the opening to the bottom of the first piston ring groove 110 is the groove extension direction, and the angle between the groove extension direction and the piston ring axial direction is acute. In other words, the groove extension direction of the first piston ring groove 110 is inclined relative to the piston ring axial direction, which can be understood as the first piston ring groove 110 being an oblique groove.

[0061] The opening side of the first piston ring groove 110 is closer to the piston ring second end 200 than the groove bottom side, that is, the first piston ring groove 110 gradually tilts away from the piston ring second end 200 from the opening to the groove bottom.

[0062] like Figure 8As shown, the airflow in the combustion chamber enters the first piston ring groove 110 through the opening of the first piston ring groove 110 and flows obliquely downward along the extension direction of the first piston ring groove 110. When it flows to the bottom of the first piston ring groove 110, a vortex is formed at the bottom. Because the first boss 210 extends into the gap but does not completely block the gap, the unblocked part of the gap forms a channel for connecting the first piston ring groove 110 and the lower part of the piston ring opening. The airflow flowing through the first piston ring groove 110 has the possibility of flowing downstream through the unblocked gap. Since a vortex is formed at the bottom of the first piston ring groove 110, this vortex can form a reverse force on the airflow flowing downward against the surface of the first boss 210 at the connection point between the gap and the first piston ring groove 110, preventing the airflow from flowing toward the gap, thereby reducing the amount of leakage.

[0063] like Figure 2 As shown, the first piston ring groove 110 includes a first semicircular groove bottom 111 and a first groove sidewall 112 connected to the first semicircular groove bottom 111 on a side away from the piston ring second end 200. The cross-section of the first semicircular groove bottom 111 is semicircular, that is, the first semicircular groove bottom 111 is a semi-cylindrical structure that passes through the end surfaces of the piston ring in the axial direction.

[0064] The angle between the first groove sidewall 112 and the piston ring's axial direction is acute. The first groove sidewall 112 may be tangent to one side of the first semicircular groove bottom 111, allowing for a smooth transition between the first groove sidewall 112 and the first semicircular groove bottom 111. The other side of the first semicircular groove bottom 111 may not have a boundary. That is, the side of the first piston ring groove 110 near the piston ring second end 200 may pass through the end of the piston ring first end 100, resulting in one side of the first piston ring groove 110 having a boundary (i.e., the first groove sidewall 112) and the other side having no boundary, thereby forming the gap disclosed in the above-mentioned embodiment. This facilitates the first boss 210 to extend into the gap, thereby forming a partial boundary of the first piston ring groove 110.

[0065] like Figure 3 As shown, the surface of the first boss 210 facing the first groove side wall 112 is the first boss front surface 211, and the first boss front surface 211 is parallel to the first groove side wall 112, that is, the first boss front surface 211 is also a slope, and has the same extension direction as the first piston ring groove 110, so that the first boss front surface 211 can serve as a partial boundary of the defect on one side of the first piston ring groove 110.

[0066] Furthermore, along the groove extension direction of the first piston ring groove 110, the gap extends from the open side of the first piston ring groove 110 to the side of the first semicircular groove bottom 111 near the piston ring second end 200. That is, the gap extends all the way to the first semicircular groove bottom 111 on the side of the first piston ring groove 110 near the piston ring second end 200, meaning that the first piston ring groove 110 does not have any boundaries on this side. Those skilled in the art will appreciate that the gap may not have such a long path. For example, a boundary extending upwardly of a predetermined length may be provided on the side of the first semicircular groove bottom 111 near the piston ring second end 200. This boundary is parallel to the first groove sidewall 112, but its length should be less than that of the first groove sidewall 112, so that the gap is formed.

[0067] In this embodiment, the bottom surface of the notch is the notch slope 113, and the surface of the first boss 210 facing the notch slope 113 is the first boss lower surface 212. The first boss lower surface 212 is parallel to the notch slope, and the angle between the notch slope and the end face of the piston ring is acute. Specifically, the notch slope 113 can be arranged perpendicular to the first groove sidewall 112.

[0068] Thus, in this embodiment, the piston ring opening can be divided into three parts: an upper opening portion, an opening transition portion, and a lower opening portion. The upper opening portion can be understood as the first piston ring groove 110, the opening transition portion can be understood as the passage between the notch slope 113 and the lower surface 212 of the first boss, and the lower opening portion can be understood as the portion of the piston ring opening that connects the opening transition portion to the lower end face of the piston ring. This lower opening portion can be designed to be parallel to the axial direction of the piston ring.

[0069] like Figure 8 As shown, when the airflow passes through the opening of the first piston ring groove 110, the airflow speed will be different due to the different internal surface shapes of the structure. The airflow on the side of the first groove side wall 112 will be accelerated when passing through, and a vortex will be formed when passing through the surface of the first semicircular groove bottom 111. The airflow in the middle of the first piston ring groove 110 will also form a small vortex under the influence of the groove airflow. The airflow close to the front surface 211 of the first boss will be affected by the resistance of the vortex at the transition part of the inflow opening and will be delayed, thereby reducing the amount of leakage.

[0070] like Figure 4-Figure 6 As shown, the second piston ring groove 120 extends from its opening to its bottom, parallel to the piston ring's axial direction. This means the groove extends parallel to the piston ring's axial direction, meaning it can be considered a straight groove. When air flows through the second piston ring groove 120, it forms a vortex directed vertically upward (based on the piston's axial direction), thereby blocking downward airflow and reducing leakage.

[0071] like Figure 5 As shown, the second piston ring groove 120 includes a second semicircular groove bottom 121 and a second groove sidewall 122 connected to the second semicircular groove bottom 121 on a side away from the piston ring second end 200. The cross-section of the second semicircular groove bottom 121 is semicircular, that is, the second semicircular groove bottom 121 is a semi-cylindrical structure that passes through the end surfaces of the piston ring in the axial direction.

[0072] The second groove sidewall 122 is parallel to the piston ring's axial direction and can be tangent to one side of the second semicircular groove bottom 121, allowing for a smooth transition between the second groove sidewall 122 and the second semicircular groove bottom 121. The other side of the second semicircular groove bottom 121 may not have a boundary. That is, the side of the first piston ring groove 110 near the piston ring second end 200 may extend through the end of the piston ring first end 100, resulting in one side of the first piston ring groove 110 having a boundary (i.e., the second groove sidewall 122) and the other side having no boundary, thereby forming the gap disclosed in the above-described embodiment. This allows the second boss 220 to extend into the gap, forming a partial boundary of the second piston ring groove 120.

[0073] like Figure 6 As shown, the surface of the second boss 220 facing the second groove side wall 122 is the second boss front surface 221, and the second boss front surface 221 is parallel to the second groove side wall 122, that is, the second boss front surface 221 is also a straight surface, and has the same extension direction as the second piston ring groove 120, so that the second boss front surface 221 can serve as the partial boundary of the defect on one side of the second piston ring groove 120.

[0074] Furthermore, along the groove extension direction of the second piston ring groove 120, the notch extends from the open side of the second piston ring groove 120 to the side of the second semicircular groove bottom 121 near the piston ring second end 200. That is, the notch on the side of the second piston ring groove 120 near the piston ring second end 200 extends all the way to the second semicircular groove bottom 121, meaning that the second piston ring groove 120 has no boundary on this side. Those skilled in the art will appreciate that the notch can also be provided with a shorter path. For example, a boundary extending upwardly of a predetermined length can be provided on the side of the second semicircular groove bottom 121 near the piston ring second end 200. This boundary is parallel to the second groove sidewall 122, but its length should be less than that of the second groove sidewall 122, to form the notch.

[0075] In this embodiment, the bottom surface of the notch is notch plane 123, and the surface of the second boss 220 facing notch plane 123 is second boss lower surface 222. Second boss lower surface 222 is parallel to notch plane 123, and notch plane 123 is parallel to the end face of the piston ring. Specifically, notch plane 123 can be arranged perpendicular to the second groove sidewall 122.

[0076] Thus, in this embodiment, the piston ring opening can be divided into three parts: an upper opening portion, an opening transition portion, and a lower opening portion. The upper opening portion can be understood as the second piston ring groove 120, the opening transition portion can be understood as the passage between the notch plane 123 and the lower surface of the second boss 222, and the lower opening portion can be understood as the portion of the piston ring opening that connects the opening transition portion to the lower end face of the piston ring. This lower opening portion can be designed to be parallel to the axial direction of the piston ring.

[0077] like Figure 7 As shown, in a specific embodiment of the present invention, both the first end 100 of the piston ring and the second end 200 of the piston ring are provided with piston ring grooves. For the sake of easy distinction, the piston ring groove on the first end 100 of the piston ring is the third piston ring groove 130, and the piston ring groove on the second end 200 of the piston ring is the fourth piston ring groove 230.

[0078] The direction of the third piston ring groove 130 and the fourth piston ring groove 230 from the opening side to the groove bottom side is the groove extension direction, and the angles between the groove extension directions of the third piston ring groove 130 and the fourth piston ring groove 230 and the axial direction of the piston ring are both acute angles, and the opening side of the third piston ring groove 130 is closer to the piston ring second end 200 than the groove bottom side, and the opening side of the fourth piston ring groove 230 is closer to the piston ring first end 100 than the groove bottom side.

[0079] Each of the third piston ring grooves 130 and the fourth piston ring grooves 230 includes at least two spaced apart grooves along the axial direction of the piston ring, and the third piston ring grooves 130 and the fourth piston ring grooves 230 are symmetrically arranged along the piston ring opening. Because multiple piston ring grooves are arranged on both the first end 100 and the second end 200 of the piston ring, the third piston ring grooves 130 and the fourth piston ring grooves 230 need to be designed as inclined grooves, with the same inclination direction as the first piston ring groove 110.

[0080] Because multiple piston ring grooves are provided, the openings of each piston ring groove cannot extend to the end surface of the piston ring. The opening of the third piston ring groove 130 is located on the end surface of the piston ring first end 100 (i.e., the end surface facing the piston ring opening), and the opening of the fourth piston ring groove 230 is located on the end surface of the piston ring second end 200 (i.e., the end surface facing the piston ring opening).

[0081] When the piston ring disclosed in this embodiment is in use, the openings of the third piston ring groove 130 and the fourth piston ring groove 230 need to be positioned close to the combustion chamber, allowing airflow to enter through the openings of the third piston ring groove 130 and the fourth piston ring groove 230. Both the third piston ring groove 130 and the fourth piston ring groove 230 can form vortices. The redirected vortices create a force acting on the piston ring opening, preventing airflow from passing through the piston ring opening and reducing gas leakage.

[0082] The present invention also discloses an engine comprising a piston, wherein a piston ring is provided on the piston, wherein the piston ring is the piston ring disclosed in the above embodiment. The engine disclosed in the present invention has all the technical effects of the above piston ring due to the presence of the above piston ring, which will not be described in detail herein.

[0083] As used in this application and the claims, unless the context clearly indicates an exception, the terms "a," "an," "an," and / or "the" are not intended to refer to the singular and may include the plural, unless the context clearly indicates otherwise. Generally speaking, the terms "comprises" and "include" only indicate the inclusion of the steps and elements specifically identified, and these steps and elements do not constitute an exclusive list. A method or apparatus may also include other steps or elements. The phrase "comprises a..." does not preclude the presence of additional identical elements in the process, method, product, or apparatus that includes the elements.

[0084] In the description of this application, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in this application based on the specific content of the technical solution.

[0085] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0086] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A piston ring, characterized in that: The piston ring comprises a first end portion (100) and a second end portion (200) of the piston ring, wherein a piston ring opening is formed between the first end portion (100) and the second end portion (200); At least one of the first end portion (100) of the piston ring and the second end portion (200) of the piston ring is provided with a piston ring groove, and the groove bottom of the piston ring groove is a curved surface structure capable of guiding airflow to form a vortex.

2. The piston ring according to claim 1, characterized in that The first end portion (100) of the piston ring is provided with the piston ring groove, the opening side of the piston ring groove passes through an axial end face of the piston ring, and the first end portion (100) of the piston ring has a notch on a side of the piston ring groove facing the second end portion (200); The second end portion (200) of the piston ring has a boss extending into the notch.

3. The piston ring according to claim 2, characterized in that The piston ring groove is a first piston ring groove (110), and the boss is a first boss (210); The direction of the first piston ring groove (110) from the opening side to the bottom side is the groove extension direction, the angle between the groove extension direction and the axial direction of the piston ring is an acute angle, and the opening side of the first piston ring groove (110) is closer to the second end portion (200) of the piston ring than the bottom side.

4. The piston ring according to claim 3, characterized in that The first piston ring groove (110) includes a first semicircular groove bottom (111) and a first groove sidewall (112) connected to the first semicircular groove bottom (111) and away from the second end portion (200) of the piston ring, wherein the angle between the first groove sidewall (112) and the axial direction of the piston ring is an acute angle; The surface of the first boss (210) facing the first groove side wall (112) is a first boss front surface (211), and the first boss front surface (211) is parallel to the first groove side wall (112).

5. The piston ring according to claim 4, characterized in that Along the extending direction of the groove, the notch extends from the opening side of the first piston ring groove (110) to a side of the first semicircular groove bottom (111) close to the second end portion (200) of the piston ring; The bottom surface of the notch is a notch slope (113), the surface of the first boss (210) facing the notch slope (113) is a first boss lower surface (212), the first boss lower surface (212) is parallel to the notch slope (113), and the angle between the notch slope (113) and the end face of the piston ring is an acute angle.

6. The piston ring according to claim 2, wherein: The piston ring groove is a second piston ring groove (120), and the boss is a second boss (220); The direction of the second piston ring groove (120) from the opening side to the groove bottom side is the groove extension direction, and the groove extension direction is parallel to the axial direction of the piston ring.

7. The piston ring according to claim 6, characterized in that The second piston ring groove (120) includes a second semicircular groove bottom (121) and a second groove sidewall (122) connected to the second semicircular groove bottom (121) and away from the second end portion (200) of the piston ring, wherein the second groove sidewall (122) is parallel to the axial direction of the piston ring; The surface of the second boss (220) facing the second groove side wall (122) is a second boss front surface (221), and the second boss front surface (221) is parallel to the second groove side wall (122).

8. The piston ring according to claim 7, characterized in that Along the extending direction of the groove, the notch extends from the opening side of the second piston ring groove (120) to the side of the second semicircular groove bottom (121) close to the second end portion (200) of the piston ring; The bottom surface of the notch is a notch plane (123), the surface of the second boss (220) facing the notch plane (123) is a second boss lower surface (222), the second boss lower surface (222) is parallel to the notch plane (123), and the notch plane (123) is parallel to the end face of the piston ring.

9. The piston ring according to claim 1, wherein: The first end portion (100) of the piston ring and the second end portion (200) of the piston ring are both provided with piston ring grooves, the piston ring groove on the first end portion (100) of the piston ring is a third piston ring groove (130), and the piston ring groove on the second end portion (200) of the piston ring is a fourth piston ring groove (230); The third piston ring groove (130) and the fourth piston ring groove (230) each include at least two spaced apart grooves along the axial direction of the piston ring, and the third piston ring groove (130) and the fourth piston ring groove (230) are symmetrically arranged along the piston ring opening; The direction of the third piston ring groove (130) and the fourth piston ring groove (230) from the opening side to the groove bottom side is the groove extension direction, and the angles between the groove extension directions of the third piston ring groove (130) and the axial direction of the piston ring are both acute angles, and the opening side of the third piston ring groove (130) is closer to the second end portion (200) of the piston ring than the groove bottom side, and the opening side of the fourth piston ring groove (230) is closer to the first end portion (100) of the piston ring than the groove bottom side.

10. An engine, characterized in that: The invention comprises a piston, wherein a piston ring is provided on the piston, and the piston ring is the piston ring according to any one of claims 1 to 9.

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