Piston ring

Abstract

The utility model provides a piston ring and relates to the technical field of piston rings. The piston ring can comprise an inner circumferential face and an outer circumferential face, the inner circumferential face comprises an upper protruding part, a first groove body and a lower protruding part which extend in the circumferential direction of the piston ring, the upper protruding part is provided with at least one second groove body, and the lower protruding part is provided with at least one third groove body. At least one oil return hole penetrating through the inner circumferential face and the outer circumferential face is formed in the first groove body, and the oil return hole, the second groove body and the third groove body are arranged in a staggered mode in the circumferential direction of the piston ring. The second groove body and the third groove body on the piston ring are staggered with the oil return hole, so that the compliance of the piston ring can be improved, and the strength of the piston ring can be ensured at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of piston rings, in particular to a piston ring. Background Art

[0002] High explosion pressure and high power will be one of the main features of the next generation of engine technology upgrades, and high explosion pressure and power put forward more stringent requirements on engine performance. As one of the core components of the engine, the engine piston ring will face the challenges of higher blowby volume and oil consumption performance requirements. As one of the most important factors affecting oil consumption, the two-piece oil ring has a great influence on oil consumption by its ability to adapt to the deformation of the cylinder liner. In the prior art, a wavy surface is formed on the inner circumference of the piston ring to improve compliance, but the piston ring does not have an oil return hole and cannot be linked with the oil return hole, and thus the improvement of the compliance of the piston ring is relatively limited. Utility Model Content

[0003] An object of the first aspect of the utility model is to provide a piston ring to solve the problem of insufficient compliance of the piston ring in the prior art.

[0004] Another object of the first aspect of the present invention is to reduce the problem of oil blowby.

[0005] In particular, the utility model provides a piston ring, comprising an inner circumferential surface and an outer circumferential surface, the inner circumferential surface comprising an upper protrusion, a first groove body and a lower protrusion extending along the circumference of the piston ring, at least one second groove body is arranged at the upper protrusion, at least one third groove body is arranged at the lower protrusion, at least one oil return hole penetrating the inner circumferential surface and the outer circumferential surface is arranged at the first groove body, and the oil return hole and the second groove body and the third groove body are alternately arranged in the circumferential direction of the piston ring.

[0006] Optionally, the second groove body and the third groove body are arranged correspondingly in the axial direction, and the second groove body and the third groove body are evenly arranged in the circumferential direction of the piston ring.

[0007] Optionally, the second trough body and the third trough body have the same shape and size, and the shape of the second trough body or the third trough body matches the shape of the oil return hole.

[0008] Optionally, the piston ring comprises a closed end, wherein one of the second groove bodies and the corresponding third groove body are arranged at a position opposite to the closed end in the circumferential direction of the piston ring.

[0009] Optionally, the second slot body and / or the third slot body gradually decreases in size in a direction away from the closed opening; and / or

[0010] The distance between two adjacent second slot bodies or two adjacent third slot bodies gradually decreases in the direction away from the closed opening.

[0011] Optionally, the second slot body and the third slot body are staggered with each other in the circumferential direction, and the oil return hole is arranged between the second slot body and the third slot body in the circumferential direction.

[0012] Optionally, the second trough body and the third trough body have the same shape, and the shapes of the second trough body and the third trough body match the shape of the cross section of the oil return hole.

[0013] Optionally, the piston ring comprises a closed end, wherein one of the second groove bodies or one of the third groove bodies is arranged at a position opposite to the closed end in the circumferential direction of the piston ring;

[0014] The sizes of the second groove body, the third groove body and the oil return hole gradually decrease in a direction away from the closed opening; and / or

[0015] The distance between two adjacent second groove bodies, the third groove body and the oil return hole gradually decreases in the direction away from the closed opening.

[0016] Optionally, the cross-section of the oil return hole is in a shape selected from a circle, an ellipse, a square, a trapezoid, a pentagon or a hexagon.

[0017] Optionally, a depth dimension of the first groove body along the radial direction of the piston ring is greater than a depth dimension of the second groove body along the radial direction of the piston ring.

[0018] The piston ring of the present scheme may include an inner circumferential surface and an outer circumferential surface, and the inner circumferential surface may include an upper protrusion, a first groove body and a lower protrusion, at least one second groove body is arranged at the upper protrusion, and at least one third groove body is arranged at the lower protrusion, and an oil return hole penetrating the inner circumferential surface and the outer circumferential surface is arranged at the first groove body, and the second groove body and the third groove body are staggered with the oil return hole so as to ensure the strength of the piston ring while improving the compliance of the piston ring.

[0019] The second groove body and the third groove body of the present scheme are arranged correspondingly in the axial direction, and the second groove body or the third groove body and the oil return hole are staggered in the circumferential direction of the piston ring, thereby avoiding the axial overlap of the second groove body and the third groove body and the oil return hole, thereby satisfying the compliance of the piston ring while also meeting the required stiffness.

[0020] The shapes and sizes of the two corresponding second grooves and the third grooves in this solution are the same, and the shape of the second groove or the third groove matches the shape of the oil return hole, which can ensure the uniformity of the compliance of different parts of the entire piston ring and avoid sudden changes in compliance, which may lead to uneven stiffness of the piston ring.

[0021] In this solution, the second groove body and the third groove body are designed to be arranged in a staggered manner, so that the engine oil will be blocked when it flows upward from the bottom of the piston ring, thereby reducing the amount of oil blowby.

[0022] Based on the detailed description of the specific embodiments of the present invention in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other purposes, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0024] Figure 1 is a schematic structural diagram of a piston ring according to a specific embodiment of the utility model;

[0025] Figure 2 yes Figure 1 The cross-sectional view after cutting along the cutting line AA;

[0026] Figure 3 yes Figure 1 The cross-sectional view along the cutting line BB;

[0027] Figure 4 It is a partial schematic diagram of a piston ring according to a specific embodiment of the utility model;

[0028] Figure 5 is a schematic structural diagram of a piston ring according to another specific embodiment of the utility model;

[0029] Figure 6 yes Figure 5 The cross-sectional view after cutting along the cutting line AA;

[0030] Figure 7 yes Figure 5 The cross-sectional view along the cutting line BB;

[0031] Figure 8 yes Figure 5 The cross-sectional view along the cutting line CC;

[0032] Fig. 9 is a schematic structural diagram of the oil upward flow path of the piston ring during operation according to another specific embodiment of the utility model;

[0033] Fig.10 is a schematic structural diagram of a piston ring according to another specific embodiment of the utility model;

[0034] Fig.11 It is a partial schematic diagram of a piston ring according to another specific embodiment of the utility model.

[0035] Description of reference numerals:

[0036] Piston ring 100; inner circumferential surface 110; outer circumferential surface 120; upper protrusion 130; first groove body 140; lower protrusion 150; second groove body 160; third groove body 170; oil return hole 180; closed mouth 190. DETAILED DESCRIPTION

[0037] In the description of this embodiment, it should be understood that the terms "length", "width", "height", "up", "down", "left", "right", "vertical", "horizontal", "bottom", "inside" and "outside" etc. indicating orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] As a specific embodiment of the present invention, Figure 1-Figure 4 As shown, the present embodiment provides a piston ring 100, which may include an inner circumferential surface 110 and an outer circumferential surface 120, wherein the inner circumferential surface 110 includes an upper protrusion 130, a first groove body 140 and a lower protrusion 150 extending along the circumference of the piston ring 100, at least one second groove body 160 is arranged at the upper protrusion 130, at least one third groove body 170 is arranged at the lower protrusion 150, and at least one oil return hole 180 penetrating the inner circumferential surface 110 and the outer circumferential surface 120 is arranged at the first groove body 140, and the oil return hole 180 is staggered with the second groove body 160 and the third groove body 170 in the circumferential direction of the piston ring 100.

[0039] Specifically, the piston ring 100 of the present embodiment may include an inner circumferential surface 110 and an outer circumferential surface 120. The inner circumferential surface 110 may include an upper protrusion 130, a first groove body 140 and a lower protrusion 150. At least one second groove body 160 is arranged at the upper protrusion 130, and at least one third groove body 170 is arranged at the lower protrusion 150. The first groove body 140 is provided with an oil return hole 180 that passes through the inner circumferential surface 110 and the outer circumferential surface 120. The second groove body 160 and the third groove body 170 are staggered with the oil return hole 180 so that the strength of the piston ring 100 can be ensured while improving the compliance of the piston ring 100.

[0040] As a specific embodiment of the present invention, the second groove body 160 and the third groove body 170 of this embodiment are correspondingly arranged in the axial direction, and the second groove body 160 and the third groove body 170 are evenly arranged in the circumferential direction of the piston ring 100 .

[0041] Specifically, the second groove body 160 and the third groove body 170 of this embodiment are arranged correspondingly in the axial direction, and the corresponding arrangement means that the projections of the second groove body 160 and the third groove body 170 in the axial direction partially or completely overlap. Specifically, the projections of the second groove body 160 and the third groove body 170 located at the same position of the piston ring 100 in this embodiment in the axial direction completely overlap. In addition, the second groove body 160 and the third groove body 170 of this embodiment are evenly arranged in the circumferential direction of the piston ring 100, so that the compliance of different positions of the piston ring 100 is not much different. In addition, the second groove body 160 or the third groove body 170 of this embodiment is staggered with the oil return hole 180 in the circumferential direction of the piston ring 100, which avoids the second groove body 160 or the third groove body 170 and the oil return hole 180 from overlapping in the axial direction, thereby satisfying the compliance of the piston ring 100 while its stiffness can also meet the requirements.

[0042] Specifically, the two corresponding second slot bodies 160 and the third slot bodies 170 have the same shape and size, and the shape of the second slot body 160 or the third slot body 170 matches the shape of the oil return hole 180 .

[0043] Specifically, the shape of the second groove body 160 or the third groove body 170 of this embodiment matches the shape of the oil return hole 180, which means that their shapes are similar. For example, when the cross-sectional shape of the oil return hole 180 is circular, the cross-sectional shapes of the second groove body 160 and the third groove body 170 can be semicircular. When the cross-sectional shape of the oil return hole 180 is elliptical, the cross-sectional shapes of the second groove body 160 and the third groove body 170 are semi-elliptical, and so on. In this way, the uniformity of the compliance of different parts of the entire piston ring 100 can be ensured, and the problem of uneven stiffness of the piston ring 100 caused by sudden changes in compliance can be avoided.

[0044] As a specific embodiment of the present invention, the piston ring 100 of this embodiment may include a closed port 190 , wherein a second groove body 160 and a corresponding third groove body 170 are arranged at positions opposite to the closed port 190 in the circumferential direction of the piston ring 100 .

[0045] Specifically, in this embodiment, the second groove body 160 and the third groove body 170 are disposed at the closed opening 190 and at a position opposite to the closed opening 190 , and other second groove bodies 160 and third groove bodies 170 can be evenly distributed at other positions of the piston ring 100 .

[0046] As another specific embodiment, the size of the second groove body 160 or the third groove body 170 of this embodiment gradually decreases in the direction away from the closed end 190. Since the stress of the piston ring 100 gradually increases from the closed end 190 to the position away from the closed end 190, the second groove body 160 or the third groove body 170 of this embodiment is designed to gradually decrease in the direction away from the closed end 190. Preferably, the size of the second groove body 160 or the third groove body 170 and the oil return hole 180 in the direction away from the closed end 190 gradually decreases to avoid the breakage of the piston ring 100 due to excessive stress and to avoid sudden changes in stress.

[0047] As another specific embodiment, the density of the second groove body 160 and / or the third groove body 170 in this embodiment gradually decreases in the direction away from the closed end 190. Similar to the above, since the stress of the piston ring 100 gradually increases from the closed end 190 to the position away from the closed end 190, the density of the second groove body 160 or the third groove body 170 in this embodiment is designed to gradually decrease in the direction away from the closed end 190. Preferably, the distance between two adjacent second groove bodies 160 or two adjacent third groove bodies 170 and the oil return hole 180 in the direction away from the closed end 190 gradually decreases, so as to avoid excessive stress at the position of the piston ring 100 away from the closed end 190, resulting in fracture, and avoid sudden changes in stress transmission.

[0048] As a specific embodiment of the present invention, Figure 5-Figure 8 As shown, the second groove body 160 and the third groove body 170 of this embodiment are staggered with each other in the circumferential direction, and the oil return hole 180 is arranged between the second groove body 160 and the third groove body 170 in the circumferential direction.

[0049] Specifically, in this embodiment, the second groove body 160 and the third groove body 170 are designed to be staggered, so that the oil will be blocked when it flows upward from the bottom of the piston ring 100 (the specific path is as follows: Fig. 9 As shown), thus reducing the amount of oil blowby.

[0050] Specifically, the second groove body 160 and the third groove body 170 in this embodiment have the same shape, and the shapes of the second groove body 160 and the third groove body 170 match the shape of the cross section of the oil return hole 180 .

[0051] Specifically, the matching of the cross-sectional shapes of the second groove body 160 , the third groove body 170 and the oil return hole 180 of this embodiment can ensure the uniformity of the compliance of the entire piston ring 100 and avoid sudden changes.

[0052] As a specific embodiment of the utility model, the piston ring 100 of this embodiment may include a closed port 190, wherein one of the second groove bodies 160 or one of the third groove bodies 170 is arranged at a position opposite to the closed port 190 in the circumferential direction of the piston ring 100. The sizes of the second groove body 160, the third groove body 170 and the oil return hole 180 gradually decrease in a direction away from the closed port 190. This prevents the piston ring 100 from breaking during operation due to excessive stress at a position away from the closed port 190, and prevents the performance of the piston ring 100 from being unstable due to sudden changes in stress at different positions of the piston ring 100.

[0053] As another specific embodiment, the distances between two adjacent second grooves 160, two adjacent third grooves 170 and two adjacent oil return holes in the embodiment gradually decrease in the direction away from the closed port 190. Such a design also prevents the piston ring 100 from breaking during operation due to excessive stress at a position away from the closed port 190, and prevents the performance of the piston ring 100 from being unstable due to sudden changes in stress at different positions of the piston ring 100.

[0054] As a specific embodiment of the present invention, the cross-sectional shape of the oil return hole 180 of this embodiment is selected from a circular shape (such as Figure 4 As shown), elliptical (as Fig.11 As shown in the figure), square, trapezoid, pentagon or hexagon. Since the shapes of the second trough body 160 and the third trough body 170 match the shape of the cross section of the oil return hole 180, the second trough body 160 and the third trough body 170 can both be half of the cross section of the oil return hole 180. For example, if the cross section of the oil return hole 180 is circular, the shapes of the second trough body 160 and the third trough body 170 are semicircular (as shown in the figure). Figure 1 and Figure 5 If the cross-section of the oil return hole 180 is elliptical, the second groove body 160 and the third groove body 170 are semi-elliptical (as shown in FIG. Fig.10 shown).

[0055] As a specific embodiment of the present invention, Figure 2 As shown, the depth dimension a1 of the first groove body 140 along the radial direction of the piston ring 100 of this embodiment is greater than the depth dimension a2 of the second groove body 160 along the radial direction of the piston ring 100. Specifically, in this embodiment, the depth dimension a1 of the first groove body 140 along the radial direction of the piston ring 100 is greater than the depth dimension a2 of the second groove body 160 along the radial direction of the piston ring 100 to avoid the piston ring 100 being too soft due to the excessive depth of the second groove body 160, thereby making the piston ring 100 prone to breakage during use.

[0056] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present invention can still be directly determined or derived from the contents disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and recognized as covering all such other variations or modifications.

Claims

1. A piston ring, characterized in that: It includes an inner circumferential surface and an outer circumferential surface, the inner circumferential surface includes an upper protrusion extending along the circumference of the piston ring, a first groove body and a lower protrusion, at least one second groove body is arranged at the upper protrusion, and at least one third groove body is arranged at the lower protrusion, and at least one oil return hole penetrating the inner circumferential surface and the outer circumferential surface is arranged at the first groove body, and the oil return hole and the second groove body and the third groove body are staggered in the circumferential direction of the piston ring.

2. The piston ring according to claim 1, characterized in that: The second groove body and the third groove body are correspondingly arranged in the axial direction, and the second groove body and the third groove body are evenly arranged in the circumferential direction of the piston ring.

3. The piston ring according to claim 2, characterized in that: The second trough body and the third trough body have the same shape and size, and the shape of the second trough body or the third trough body matches the shape of the oil return hole.

4. The piston ring according to claim 3, characterized in that: The piston ring comprises a closed end, wherein one of the second groove bodies and the corresponding third groove body are arranged at positions opposite to the closed end in the circumferential direction of the piston ring.

5. The piston ring according to claim 4, characterized in that: The size of the second slot body and / or the third slot body gradually decreases in a direction away from the closed opening; and / or The distance between two adjacent second slot bodies or two adjacent third slot bodies gradually decreases in the direction away from the closed opening.

6. The piston ring according to claim 1, characterized in that The second groove body and the third groove body are staggered with each other in the circumferential direction, and the oil return hole is arranged between the second groove body and the third groove body in the circumferential direction.

7. The piston ring according to claim 6, characterized in that The second groove body and the third groove body have the same shape, and the shapes of the second groove body and the third groove body match the shape of the cross section of the oil return hole.

8. The piston ring according to claim 7, characterized in that The piston ring comprises a closed end, wherein one of the second groove bodies or one of the third groove bodies is arranged at a position opposite to the closed end in the circumferential direction of the piston ring; The sizes of the second groove body, the third groove body and the oil return hole gradually decrease in a direction away from the closed opening; and / or The distances between two adjacent second groove bodies, two adjacent third groove bodies and two adjacent oil return holes gradually decrease in the direction away from the closed opening.

9. The piston ring according to claim 1, characterized in that: The cross-sectional shape of the oil return hole is selected from a circle, an ellipse, a square, a trapezoid, a pentagon or a hexagon.

10. The piston ring according to claim 1, characterized in that The depth dimension of the first groove body along the radial direction of the piston ring is greater than the depth dimension of the second groove body along the radial direction of the piston ring.

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