Air leakage prevention piston ring and engine

Abstract

The utility model discloses an air leakage prevention piston ring and an engine. The air leakage prevention piston ring comprises a piston ring first end and a piston ring second end. Piston ring grooves are formed in the two end faces, in the axial direction of the air leakage prevention piston ring, of the first end of the piston ring, and the groove bottoms of the piston ring grooves are of curved surface structures capable of guiding airflow to form vortexes. The first end of the piston ring is provided with a notch on one side, facing the second end of the piston ring, of the piston ring groove, and the second end of the piston ring is provided with a boss extending into the notch. The air flow entering the upper piston ring groove can form vortex gas which overflows upwards under the guiding action of the groove bottom of the piston ring groove. The vortex gas increases the resistance of airflow flowing downwards through the opening of the piston ring, so that the sealing effect is improved, and the air leakage is reduced. If air flow or engine oil moves upwards, the air flow or engine oil moves upwards under the influence of the vortex formed by the piston ring groove below, so that the air flow or engine oil moving upwards is slowed down, and the effects of relieving air flow and reducing engine oil consumption are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, and more specifically, to an air leakage prevention piston ring and an engine. Background Art

[0002] A piston ring is a metal ring used to be embedded inside a piston groove. The piston rings are divided into two types: compression rings and oil control rings. The compression rings can be used to seal the combustible mixture gas inside the combustion chamber; the oil control rings are used to scrape off the excess oil on the cylinder. Piston rings are widely used in various power machines, such as steam engines, diesel engines, gasoline engines, compressors, hydraulic presses, etc., and are widely used in automobiles, trains, ships, yachts, etc.

[0003] With the continuous update of emission regulations, more stringent requirements are put forward for the oil consumption and air leakage of engines. As one of the core components of the engine, the piston ring has an important influence on both the oil consumption and the air leakage. The existing compression rings generally use the flat mouth and closed mouth scheme, and it is relatively easy for gas and oil to pass through this shape, which has an adverse effect on the oil consumption and the air leakage.

[0004] Therefore, how to improve the sealing effect of the piston ring and reduce the air leakage is an urgent problem to be solved by those skilled in the art. Summary of the Utility Model

[0005] In view of this, the purpose of the utility model is to provide an air leakage prevention piston ring to improve the sealing effect of the air leakage prevention piston ring and reduce the air leakage;

[0006] Another purpose of the utility model is to provide an engine with the above-mentioned air leakage prevention piston ring.

[0007] To achieve the above purpose, the utility model provides the following technical solutions:

[0008] An air leakage prevention piston ring includes a first end portion and a second end portion of the piston ring, and a piston ring opening is formed between the first end portion and the second end portion of the piston ring;

[0009] Both end faces of the first end portion of the piston ring in the axial direction of the air leakage prevention piston ring are provided with piston ring grooves, the openings of the piston ring grooves are located on the end faces of the air leakage prevention piston ring, and the bottoms of the piston ring grooves are curved surface structures capable of guiding air flow to form eddy currents;

[0010] The first end portion of the piston ring has a notch on the side facing the second end portion of the piston ring of the piston ring groove, and the second end portion of the piston ring has a boss extending into the notch.

[0011] Optionally, in the above-described air leakage prevention piston ring, along the axial direction of the air leakage prevention piston ring, the middle plane of the air leakage prevention piston ring is a preset plane, and the two piston ring grooves are symmetrically arranged along the preset plane, and the two bosses are symmetrically arranged along the preset plane.

[0012] Optionally, in the above-described air leakage prevention piston ring, one of the two piston ring grooves on the first end portion of the piston ring is a first piston ring groove, and the other is a second piston ring groove; or,

[0013] both of the two piston ring grooves on the first end portion of the piston ring are the first piston ring groove or both are the second piston ring groove, and the structures of the first piston ring groove and the second piston ring groove are different.

[0014] Optionally, in the above-described air leakage prevention piston ring, the boss corresponding to the first piston ring groove is a first boss;

[0015] The direction from the opening side to the bottom side of the first piston ring groove is the groove extension direction, and the groove extension direction is parallel to the axial direction of the air leakage prevention piston ring.

[0016] Optionally, in the above-described air leakage prevention piston ring, the first piston ring groove includes a first semi-circular bottom and a first groove side wall connected to the side of the first semi-circular bottom away from the second end portion of the piston ring, and the first groove side wall is parallel to the axial direction of the air leakage prevention piston ring;

[0017] The surface of the first boss facing the first groove side wall is the front surface of the first boss, and the front surface of the first boss is parallel to the first groove side wall.

[0018] Optionally, in the above-described air leakage prevention piston ring, the boss corresponding to the second piston ring groove is a second boss;

[0019] The direction from the opening side to the bottom side of the second piston ring groove is the groove extension direction, and the included angle between the groove extension direction and the axial direction of the air leakage prevention piston ring is an acute angle, and the opening side of the second piston ring groove is closer to the second end portion of the piston ring than the bottom side.

[0020] Optionally, in the above-described air leakage prevention piston ring, the second piston ring groove includes a second semi-circular bottom and a second groove side wall connected to the side of the second semi-circular bottom away from the second end portion of the piston ring, the included angle between the second groove side wall and the axial direction of the air leakage prevention piston ring is an acute angle, the second groove side wall extends to the end face of the air leakage prevention piston ring through a second groove extension wall, and the second groove extension wall is parallel to the axial direction of the air leakage prevention piston ring;

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

[0022] Optionally, in the above-mentioned air leakage prevention piston ring, the notch corresponding to the first piston ring groove is the first notch, the bottom surface of the first notch is the first notch plane, the surface of the first boss facing the first notch plane is the lower surface of the first boss, the lower surface of the first boss is parallel to the first notch plane, and the first notch plane is parallel to the end face of the air leakage prevention piston ring;

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

[0024] Optionally, in the above-mentioned air leakage prevention piston ring, a piston ring bump protruding in the direction of the second end of the piston ring is formed between the two piston ring grooves at the first end of the piston ring;

[0025] A piston ring slot is formed between the two bosses at the second end of the piston ring. The piston ring bump extends into the piston ring slot and has a gap with the side wall of the piston ring slot.

[0026] In the air leakage prevention piston ring provided by the present invention, piston ring grooves are provided on both the upper and lower end faces of the first end of the piston ring, and the bottom of the piston ring groove is a curved surface structure capable of guiding air flow to form a vortex. During the movement of the piston in the cylinder, when the air flow from the combustion chamber flows through the piston ring opening between the first end and the second end of the piston ring, part of the air flow will flow into the upper piston ring groove. The air flow entering the piston ring groove flows from the opening side of the piston ring groove to the bottom side of the groove. When flowing to the bottom side of the groove, due to the bottom of the groove being a curved surface structure, under the guiding action of the curved surface structure at the bottom of the groove, this part of the air flow will form a vortex gas that surges upward. The vortex gas returns upward and impacts the air flow at the notch, preventing the air flow passing through the notch from flowing downstream, that is, increasing the resistance of the air flow flowing downward through the piston ring opening, thereby improving the sealing effect and reducing the air leakage.

[0027] If air flow or engine oil creeps up, when passing through the piston ring opening from bottom to top, it will also be affected by the vortex formed by the lower piston ring groove, so as to delay the creeping amount of air flow or engine oil, thereby achieving the effects of alleviating blow-by and reducing engine oil consumption.

[0028] An engine includes a piston, and a piston ring is disposed on the piston. The piston ring is the air leakage prevention piston ring described in any one of the above.

[0029] In the engine disclosed in the embodiment of the present invention, due to the above-mentioned air leakage prevention piston ring, it has all the technical effects of the above-mentioned air leakage prevention piston ring, which will not be elaborated herein again. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0031] Figure 1 It is a partial structural schematic diagram of the air leakage prevention piston ring disclosed in Embodiment 1 of the present invention;

[0032] Figure 2 It is a partial structural schematic diagram of the first end of the piston ring disclosed in Embodiment 1 of the present invention;

[0033] Figure 3 It is a partial structural schematic diagram of the second end of the piston ring disclosed in Embodiment 1 of the present invention;

[0034] Figure 4 It is a partial structural schematic diagram of the air leakage prevention piston ring disclosed in Embodiment 2 of the present invention;

[0035] Figure 5 It is a partial structural schematic diagram of the first end of the piston ring disclosed in Embodiment 2 of the present invention;

[0036] Figure 6 It is a partial structural schematic diagram of the second end of the piston ring disclosed in Embodiment 2 of the present invention;

[0037] Figure 7 It is a vortex diagram of the air leakage prevention piston ring disclosed in Embodiment 1 of the present invention.

[0038] The meanings of the reference numerals in the drawings are as follows:

[0039] 100 - the first end of the piston ring; 200 - the second end of the piston ring;

[0040] 110 - the first piston ring groove; 120 - the first piston ring projection;

[0041] 111 - the first semi-circular groove bottom; 112 - the first groove side wall; 121 - the first notch plane; 122 -;

[0042] 210 - First boss; 220 - First piston ring groove

[0043] 211 - Front surface of the first boss; 212 - Lower surface of the first boss; 221 - Bottom wall of the first groove

[0044] 130 - Second piston ring groove; 140 - Second piston ring bump

[0045] 131 - Bottom of the second semi-circular groove; 132 - Side wall of the second groove; 133 - Extended wall of the second groove; 141 - Second notch plane; 142 - Front surface of the second bump

[0046] 230 - Second boss; 240 - Second piston ring groove

[0047] 231 - Front surface of the second boss; 232 - Lower surface of the second boss; 241 - Bottom wall of the second groove Detailed implementation mode

[0048] The core of the present utility model lies in providing an anti-leakage piston ring to improve the sealing effect of the anti-leakage piston ring and reduce the air leakage volume.

[0049] Another core of the present utility model lies in providing an engine having the above anti-leakage piston ring.

[0050] Hereinafter, the embodiments will be described with reference to the drawings. In addition, the embodiments shown below do not impose any limitation on the content of the utility model described in the claims. Further, all the contents of the configurations shown in the following embodiments are not necessarily essential to the solution of the utility model described in the claims. It should be noted that for the sake of description, only the parts related to the relevant utility model are shown in the drawings. Without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other.

[0051] The piston ring opening refers to the gap between the two ends of the piston ring. During assembly, the piston ring is expanded with a special tool to open the piston ring opening and is installed in the piston ring groove. Due to the existence of the piston ring opening, the piston ring can still move relative to the piston ring groove during movement when heated. The piston ring opening is also a main part of the air leakage channel.

[0052] The main function of the compression ring 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 (i.e., the piston ring closest to the combustion chamber) is the most important air sealing device. Its air leakage channel is composed of the area enclosed by the piston ring opening of the first ring, the cylinder liner, and the upper edge of the second ring bank. Due to the elastic force, the piston ring will closely adhere to the cylinder wall. When the gas pressure is relatively high, the first ring will closely adhere to the lower part of the piston ring groove. Therefore, the opening of the first ring is the largest air leakage channel. If not properly handled, it will cause an increase in the air leakage volume, and then lead to a series of problems such as increased oil consumption and carbon deposition.

[0053] Based on this, the embodiments of the present utility model disclose an anti-air leakage piston ring to improve the sealing effect of the anti-air leakage piston ring and reduce the air leakage amount. As Figure 1 and Figure 4 shown, the anti-air leakage piston ring disclosed in the embodiments of the present utility model includes a first end portion 100 of the piston ring and a second end portion 200 of the piston ring. That is, the anti-air leakage piston ring is generally an unclosed circular ring structure, so that the anti-air leakage piston ring has two end portions, and these two end portions are respectively defined as the first end portion 100 of the piston ring and the second end portion 200 of the piston ring for the convenience of distinction.

[0054] A piston ring opening is formed between the first end portion 100 of the piston ring and the second end portion 200 of the piston ring, that is, the gap between the first end portion 100 of the piston ring and the second end portion 200 of the piston ring forms the piston ring opening; specifically, the width size of the piston ring opening can be set by those skilled in the art according to needs, and the width of the piston ring opening is not limited in this embodiment.

[0055] 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 other is provided with a convex platform. In a specific embodiment of the present utility model, the piston ring groove is provided on the first end portion 100 of the piston ring, and both end faces of the first end portion 100 of the piston ring in the axial direction of the anti-air leakage piston ring are provided with piston ring grooves. The piston ring groove located above is mainly used to reduce the air leakage amount, and the piston ring groove located below is mainly used to prevent the engine oil from climbing up. The opening of the piston ring groove is located on the end face of the anti-air leakage piston ring. The opening of the piston ring groove located above penetrates through the upper end face (the upper end face during normal use) of the anti-air leakage piston ring, and the opening of the piston ring groove located below penetrates through the lower end face (the lower end face during normal use) of the anti-air leakage piston ring.

[0056] The bottom of the piston ring groove is a curved surface structure capable of guiding the air flow to form a vortex. Taking the piston ring groove located above as an example, the piston ring groove can guide the incoming air flow into a vortex, change the air flow direction, and utilize the air flow entering the piston ring groove to increase the resistance of the air flow flowing downward from the piston ring opening.

[0057] The opening side of the piston ring groove penetrates through the end face in the axial direction of the anti-air leakage piston ring, that is, after the anti-air leakage piston ring is installed on the piston, the opening side of the piston ring groove located above should penetrate through the top of the anti-air leakage piston ring, and the opening side of the piston ring groove located above should penetrate through the bottom of the anti-air leakage piston ring, so that after the piston is applied to the combustion chamber, the opening side of the piston ring groove located above is the side facing the combustion chamber, and the air flow generated in the combustion chamber can enter the piston ring groove through the opening of the piston ring groove.

[0058] The first end portion 100 of the piston ring has a notch on the side facing the second end portion 200 of the piston ring in the piston ring groove. This notch realizes the communication between the piston ring groove and the piston ring opening. In other words, the two piston ring grooves become a part of the piston ring opening. The second end portion 200 of the piston ring has a boss extending into the notch. By providing the boss on the second end portion 200 of the piston ring, the boss blocks part of the notch, so that the piston ring opening presents a zigzag structure in the direction from one end to the other end; in other words, the piston ring opening is not on the same straight line.

[0059] In this embodiment, the piston ring groove can be understood as a part of the piston ring opening. The air flow needs to first flow through the upper piston ring groove, and then flow through other parts of the piston ring opening below the piston ring groove (i.e., the side away from the combustion chamber in the use state), and enter the lower piston ring groove before it can pass through this air leakage prevention piston ring. Since it needs to turn to be discharged from the other end, this undoubtedly increases the resistance of the air flow, and to a certain extent, it can also reduce the air leakage.

[0060] In summary, for the air leakage prevention piston ring provided by the present utility model, piston ring grooves are provided on both the upper and lower end faces of the first end portion 100 of the piston ring, and the bottom of the piston ring groove is a curved surface structure capable of guiding the air flow to form a vortex. During the movement of the piston in the cylinder, when the air flow from the combustion chamber flows through the piston ring opening between the first end portion 100 and the second end portion 200 of the piston ring, part of the air flow will flow into the upper piston ring groove.

[0061] As Figure 7 shown, the air flow entering the upper piston ring groove flows from the opening side of the piston ring groove to the bottom side of the groove. When flowing to the bottom side of the groove, due to the bottom of the groove being a curved surface structure, under the guiding action of the bottom of the curved surface structure, this part of the air flow will change direction to form an upward surging vortex gas. The vortex gas returns upward and impacts the air flow at the notch, preventing the air flow flowing downward through the notch, that is, increasing the resistance of the air flow flowing downward through the piston ring opening, thereby improving the sealing effect and reducing the air leakage.

[0062] If air flow or engine oil creeps up, when passing through the piston ring opening from bottom to top, it will also be affected by the vortex formed by the lower piston ring groove to delay the amount of air flow or engine oil creeping up, so as to achieve the effect of alleviating blow-by and reducing engine oil consumption.

[0063] One of the two piston ring grooves on the first end portion 100 of the piston ring is the first piston ring groove 110, and the other is the second piston ring groove 130. The structures of the first piston ring groove 110 and the second piston ring groove 130 are different. That is, the structures of the two piston ring grooves on the first end portion 100 of the piston ring can be designed to be different. Of course, both of the two piston ring grooves on the first end portion 100 of the piston ring can also be the first piston ring groove 110 or both be the second piston ring groove 130, that is, the structures of the two piston ring grooves on the first end portion 100 of the piston ring are designed to be the same.

[0064] When the structures of the two piston ring grooves on the first end portion 100 of the piston ring are the same, the two piston ring grooves can be arranged symmetrically. Along the axial direction of the air leakage prevention piston ring, the middle plane of the air leakage prevention piston ring is defined as the preset plane, and the two piston ring grooves are arranged symmetrically along the preset plane, and the two bosses are arranged symmetrically along the preset plane. That is, the two piston ring grooves are symmetric about the middle plane in the thickness direction of the air leakage prevention piston ring, and the two bosses are also symmetric about the middle plane in the thickness direction of the air leakage prevention piston ring.

[0065] In this embodiment, the piston ring groove of the air leakage prevention 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 (as Figures 1-3 shown). The piston ring groove of the air leakage prevention piston ring disclosed in the second embodiment of the present invention is defined as the second piston ring groove 130, and the boss is defined as the second boss 230 (as Figures 4-6 shown).

[0066] As Figures 1-3 shown, the direction from the opening side to the bottom side of the first piston ring groove 110 is the groove extension direction. The groove extension direction of the first piston ring groove 110 is parallel to the axial direction of the air leakage prevention piston ring. That is, the groove extension direction of the first piston ring groove 110 is parallel to the axial direction of the air leakage prevention piston ring, and it can be understood that the first piston ring groove 110 is a straight groove. When the air flow passes through the first piston ring groove 110, a vortex will also be formed, and the direction is vertically upward (based on the axial direction of the piston being the vertical direction), thereby blocking the downward flow of the air flow and reducing the air leakage amount.

[0067] As Figure 2 shown, the first piston ring groove 110 includes a first semi-circular groove bottom 111 and a first groove side wall 112 connected to the side of the first semi-circular groove bottom 111 away from the second end portion 200 of the piston ring. The cross-section of the first semi-circular groove bottom 111 is semi-circular, that is, the first semi-circular groove bottom 111 is a semi-cylindrical surface structure that penetrates the two end faces in the axial direction of the air leakage prevention piston ring.

[0068] The axial direction of the first groove side wall 112 is parallel to that of the air leakage prevention piston ring. The first groove side wall 112 can be tangent to one side of the first semi-circular groove bottom 111, so that the first groove side wall 112 and the first semi-circular groove bottom 111 can have a smooth transition. On the other side of the first semi-circular groove bottom 111, a boundary may not be provided, that is, on one side of the first piston ring groove 110 close to the second end 200 of the piston ring, it can penetrate through the end of the first end 100 of the piston ring, so that one side of the first piston ring groove 110 has a boundary (i.e., the first groove side wall 112), and the other side has no boundary, so as to form the notch disclosed in the above embodiment, so as to facilitate the first boss 210 to extend into the notch to form part of the boundary of the first piston ring groove 110.

[0069] As Figure 3 shown, the surface of the first boss 210 facing the first groove side wall 112 is the front surface 211 of the first boss. The front surface 211 of the first boss is parallel to the first groove side wall 112, that is, the front surface 211 of the first boss is also a straight surface and has the same extending direction as the first piston ring groove 110, so that the front surface 211 of the first boss can serve as the missing part of the boundary on one side of the first piston ring groove 110.

[0070] As Figures 4-6 shown, the direction from the opening side to the bottom side of the second piston ring groove 130 is the groove extending direction, and the included angle between the groove extending direction and the axial direction of the air leakage prevention piston ring is an acute angle. That is, the groove extending direction of the second piston ring groove 130 is inclined relative to the axial direction of the air leakage prevention piston ring, and it can be understood as the inclined groove of the second piston ring groove 130.

[0071] The opening side of the second piston ring groove 130 is closer to the second end 200 of the piston ring than the bottom side, that is, in the direction from the opening to the bottom of the second piston ring groove 130, it gradually inclines in the direction away from the second end 200 of the piston ring.

[0072] As Figure 5 shown, the second piston ring groove 130 includes a second semi-circular groove bottom 131 and a second groove side wall 132 connected to the side of the second semi-circular groove bottom 131 far from the second end 200 of the piston ring. The cross-section of the second semi-circular groove bottom 131 is semi-circular, that is, the second semi-circular groove bottom 131 is a semi-cylindrical surface structure penetrating through the two end faces in the axial direction of the air leakage prevention piston ring.

[0073] The included angle between the side wall 132 of the second groove and the axis of the air leakage prevention piston ring is an acute angle. The side wall 132 of the second groove can be tangent to one side of the second semi-circular groove bottom 131, so that the side wall 132 of the second groove and the second semi-circular groove bottom 131 can have a smooth transition. The side wall 132 of the second groove extends to the end face of the air leakage prevention piston ring through the second groove extension wall 133. That is, the side wall 132 of the second groove does not extend to the end face of the air leakage prevention piston ring, but an additional second groove extension wall 133 is added, and the effect of penetrating the end face of the air leakage prevention piston ring is achieved through the second groove extension wall 133. The second groove extension wall 133 is parallel to the axis of the air leakage prevention piston ring.

[0074] On the other side of the second semi-circular groove bottom 131, a boundary may not be provided, that is, on the side of the second piston ring groove 130 close to the second end 200 of the piston ring, it can penetrate the end of the first end 100 of the piston ring, so that one side of the second piston ring groove 130 has a boundary (i.e., the side wall 132 of the second groove), and the other side has no boundary, so as to form the notch disclosed in the above embodiment, so as to facilitate the second boss 230 to extend into the notch to form a partial boundary of the second piston ring groove 130.

[0075] As Figure 6 shown, the surface of the second boss 230 facing the side wall 132 of the second groove is the front surface 231 of the second boss. The front surface 231 of the second boss is parallel to the second groove extension wall 133, that is, the extending direction of the front surface 231 of the second boss is the same as that of the second groove extension wall 133, so that the front surface 231 of the second boss can serve as a missing partial boundary on one side of the second piston ring groove 130 and form an opening of the second piston ring groove 130 with the second groove extension wall 133.

[0076] Further, the notch corresponding to the first piston ring groove 110 is defined as the first notch. As Figure 2 and Figure 3 shown, along the groove extending direction of the first piston ring groove 110, the first notch can extend from the opening side of the first piston ring groove 110 to the side of the first semi-circular groove bottom 111 close to the second end 200 of the piston ring. That is, on the side of the first piston ring groove 110 close to the second end 200 of the piston ring, the first notch extends all the way to the first semi-circular groove bottom 111, that is, no boundary is provided on this side of the first piston ring groove 110. Those skilled in the art can understand that the first notch may not have such a long path. For example, on the side of the first semi-circular groove bottom 111 close to the second end 200 of the piston ring, a boundary extending towards the end face of the air leakage prevention piston ring with a preset length is provided, and this boundary is parallel to the side wall 112 of the first groove, but the length should be less than the length of the side wall 112 of the first groove, so as to form the first notch.

[0077] The bottom surface of the first notch is the first notch plane 121. The surface of the first boss 210 facing the first notch plane 121 is the first lower surface 212 of the boss. The first lower surface 212 of the boss is parallel to the first notch plane 121. The first notch plane 121 is parallel to the end face of the air leakage prevention piston ring, that is, the first notch plane 121 is perpendicular to the side wall 112 of the first groove.

[0078] The notch corresponding to the second piston ring groove 130 is defined as the second notch. The structure of the second notch can refer to the first notch and will not be elaborated here. The bottom surface of the second notch is the second notch plane 141. The surface of the second boss 230 facing the second notch plane 141 is the second lower surface 232 of the boss. The second lower surface 232 of the boss is parallel to the second notch plane 141. The second notch plane 141 is parallel to the end face of the air leakage prevention piston ring.

[0079] In a specific embodiment of the present utility model, the first end 100 of the piston ring forms a piston ring bump protruding towards the second end 200 of the piston ring between the two piston ring grooves, such as the first piston ring bump 120 for the first piston ring groove 110 and the second piston ring bump 140 for the second piston ring groove 130. Among them, the first notch plane 121 can be located on the first piston ring bump 120, and the second notch plane 141 can be located on the second piston ring bump 140. The side surface of the first piston ring bump 120 facing the second end 200 of the piston ring is the front surface 122 of the bump, and the side surface of the second piston ring bump 140 facing the second end 200 of the piston ring is the front surface 142 of the bump.

[0080] The second end 200 of the piston ring forms a piston ring slot between the two bosses. The piston ring bump extends into the piston ring slot and has a gap with the side wall of the piston ring slot. Such as the first piston ring slot 220 for the first boss 210 and the second piston ring slot 240 for the second boss 230. The first lower surface 212 of the boss is equivalent to the two side walls of the first piston ring slot 220, and the second lower surface 232 of the boss is equivalent to the two side walls of the second piston ring slot 240. The bottom wall of the first piston ring slot 220 is the first bottom wall 221 of the slot, and the bottom wall of the second piston ring slot 240 is the second bottom wall 241 of the slot.

[0081] Thus, in this embodiment, the piston ring opening can be divided into three parts: the upper part of the opening, the transition part of the opening, and the lower part of the opening. Among them, the upper part of the opening can be understood as the upper first piston ring groove 110 / second piston ring groove 130, and the lower part of the opening can be understood as the lower first piston ring groove 110 / second piston ring groove 130.

[0082] In the solution for the first piston ring groove 110, the opening transition portion can be understood to include the channels between the first notch plane 121 and the lower surface 212 of the first boss, and between the front surface 122 of the first bump and the bottom wall 221 of the first groove.

[0083] In the solution for the second piston ring groove 130, the opening transition portion can be understood to include the channels between the second notch plane 141 and the lower surface 232 of the second boss, and between the front surface 142 of the second bump and the bottom wall 241 of the second groove.

[0084] As Figure 7 shown, taking the solution of the first piston ring groove 110 as an example, when the air flow passes through the opening of the upper first piston ring groove 110, due to the different shapes of the internal surfaces of the structure, the air flow velocity will be different. The air flow on one side of the first groove side wall 112 will accelerate when passing through, and eddy currents will be formed on the surface of the first semi-circular groove bottom 111. The air flow near the middle of the first piston ring groove 110 will also form small eddy currents under the influence of the groove air flow. The air flow near the front surface 211 of the first boss will be affected by the resistance of the eddy current when flowing into the opening transition portion, thus delaying the downward flow, and further reducing the air leakage. If air flow or engine oil creeps up, when passing through the opening of the lower first piston ring groove 110 from bottom to top, eddy currents will also be formed on one side near the first groove side wall 112, and then resistance will be formed to delay the air flow or engine oil creep-up amount, so as to achieve the effect of alleviating blow-by and reducing engine oil consumption.

[0085] Regarding the solution of the second piston ring groove 130, the principle of generating eddy currents is the same as that of the first piston ring groove 110, and will not be elaborated herein.

[0086] The embodiment of the present utility model also discloses an engine, including a piston, on which a piston ring is arranged, and the piston ring is the anti-air leakage piston ring disclosed in the above embodiment. The engine disclosed in the embodiment of the present utility model, due to having the above anti-air leakage piston ring, thus has all the technical effects of the above anti-air leakage piston ring, which will not be elaborated herein.

[0087] As shown in this application and the claims, unless the context clearly indicates an exceptional situation, words such as "a", "an", "one" and / or "the" are not specifically singular and may also include plural. Generally speaking, the terms "comprising" and "including" only indicate the inclusion of the clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. Elements defined by the statement "including one..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0088] In the description of the present application, unless otherwise expressly defined, terms such as "arrangement", "installation", "connection", etc. shall be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present application in combination with the specific content of the technical solution.

[0089] In this specification, the various embodiments are described in a progressive manner. What each embodiment focuses on is the difference from other embodiments. For the same or similar parts among the various embodiments, reference can be made to each other.

[0090] In this article, specific examples are used to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and modifications can be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A leak-proof piston ring, characterized in that, It includes a first end portion (100) of the piston ring and a second end portion (200) of the piston ring. A piston ring opening is formed between the first end portion (100) and the second end portion (200) of the piston ring; Both end faces of the first end portion (100) of the piston ring in the axial direction of the air leakage prevention piston ring are provided with piston ring grooves. The opening of the piston ring groove is located on the end face of the air leakage prevention piston ring, and the bottom of the piston ring groove is a curved surface structure capable of guiding the airflow to form a vortex; The first end portion (100) of the piston ring has a notch on the side facing the second end portion (200) of the piston ring in the piston ring groove, and the second end portion (200) has a boss extending into the notch.

2. The airtightness prevention piston ring according to claim 1, characterized in that, In the axial direction of the air leakage prevention piston ring, the middle plane of the air leakage prevention piston ring is a preset plane. The two piston ring grooves are symmetrically arranged along the preset plane, and the two bosses are symmetrically arranged along the preset plane.

3. The air leakage prevention piston ring according to claim 1, characterized in that, One of the two piston ring grooves on the first end portion (100) of the piston ring is a first piston ring groove (110), and the other is a second piston ring groove (130); or, Both of the two piston ring grooves on the first end portion (100) of the piston ring are the first piston ring groove (110) or both are the second piston ring groove (130), and the structures of the first piston ring groove (110) and the second piston ring groove (130) are different.

4. The anti-air leakage piston ring according to claim 3, characterized in that, The boss corresponding to the first piston ring groove (110) is a first boss (210); The direction from the opening side to the bottom side of the first piston ring groove (110) is the groove extension direction, and the groove extension direction is parallel to the axial direction of the air leakage prevention piston ring.

5. The air leakage prevention piston ring according to claim 4, characterized in that, The first piston ring groove (110) includes a first semi-circular groove bottom (111) and a first groove side wall (112) connected to the side of the first semi-circular groove bottom (111) away from the second end portion (200) of the piston ring. The first groove side wall (112) is parallel to the axial direction of the air leakage prevention piston ring; The surface of the first boss (210) facing the first groove side wall (112) is a first front surface (211) of the first boss, and the first front surface (211) of the first boss is parallel to the first groove side wall (112).

6. The anti-air leakage piston ring according to claim 4, characterized in that, The boss corresponding to the second piston ring groove (130) is a second boss (230); The direction from the opening side to the bottom side of the second piston ring groove (130) is the groove extension direction, and the included angle between the groove extension direction and the axial direction of the air leakage prevention piston ring is an acute angle, and the opening side of the second piston ring groove (130) is closer to the second end portion (200) of the piston ring than the bottom side.

7. The anti-air leakage piston ring according to claim 6, wherein, The second piston ring groove (130) includes a second semi-circular groove bottom (131) and a second groove side wall (132) connected to a side of the second semi-circular groove bottom (131) away from the second end portion (200) of the piston ring. The included angle between the second groove side wall (132) and the axial direction of the air leakage prevention piston ring is an acute angle. The second groove side wall (132) extends to the end face of the air leakage prevention piston ring through a second groove extension wall (133). The second groove extension wall (133) is parallel to the axial direction of the air leakage prevention piston ring; The surface of the second boss (230) facing the second groove side wall (132) is a second front surface (231) of the boss. The second front surface (231) of the boss is parallel to the second groove extension wall (133).

8. The anti-air leakage piston ring according to claim 6, characterized in that, The notch corresponding to the first piston ring groove (110) is a first notch. The bottom surface of the first notch is a first notch plane (121). The surface of the first boss (210) facing the first notch plane (121) is a first lower surface (212) of the boss. The first lower surface (212) of the boss is parallel to the first notch plane (121). The first notch plane (121) is parallel to the end face of the air leakage prevention piston ring; The notch corresponding to the second piston ring groove (130) is a second notch. The bottom surface of the second notch is a second notch plane (141). The surface of the second boss (230) facing the second notch plane (141) is a second lower surface (232) of the boss. The second lower surface (232) of the boss is parallel to the second notch plane (141). The second notch plane (141) is parallel to the end face of the air leakage prevention piston ring.

9. The airtightness-preventing piston ring according to any one of claims 1-8, characterized in that The first end portion (100) of the piston ring forms a piston ring bump protruding in the direction of the second end portion (200) of the piston ring between the two piston ring grooves; The second end portion (200) of the piston ring forms a piston ring insertion groove between the two bosses. The piston ring bump extends into the piston ring insertion groove and has a gap with the side wall of the piston ring insertion groove.

10. An engine, characterized in that, It includes a piston, and a piston ring is provided on the piston. The piston ring is an air leakage prevention piston ring as described in any one of claims 1-9.

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