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 opening part, a top surface, a bottom surface and an outer circular surface, wherein the opening part comprises two joint end surfaces; a fillet is formed between the end face of the connector and the outer circle face, and the section of the fillet is a single-section type arc with the same curvature after the fillet is sectioned on the face, parallel to the bottom face, of the piston ring. The included angle between the tangent line at the intersection point of the arc and the outer circle face and the outer circle face is larger than the included angle between the tangent line at the intersection point of the arc and the connector end face and the connector end face. The single-section type arc with the same curvature is formed between the end face and the outer circle face of the connector, so that the machining process of the piston ring can be simplified, the cost is reduced, and the yield is increased. The design of the included angle between the arc and the outer circle face and the joint end face can achieve a better effect of reducing the blow-by amount, reduce deterioration of engine oil caused by high-temperature fuel gas washing, and prolong the service life of the engine oil.

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, high power, and long oil change mileage will be one of the main features of the next generation of medium and heavy truck engine technology upgrades. High explosion pressure and power put forward more stringent requirements on engine performance, and long oil change mileage puts forward more stringent requirements on engine durability. 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. For clean energy fuel engines such as hydrogen, natural gas, and methanol, extremely low blowby volume and extremely low oil consumption requirements put forward higher requirements on the design of piston rings. Especially for hydrogen engines, the amount of blowby directly affects the hydrogen concentration in the crankcase. As we all know, the explosion concentration range of hydrogen is very wide. Extremely low blowby levels require a smaller top ring closed gap design, but too small a top ring closed gap design will cause the piston ring to align during operation, resulting in ring breakage.

[0003] The current typical top ring design is characterized by a closed gap and a closed gap chamfer. These two features are key features for controlling the amount of blowby. In the prior art, if the chamfer formed between the closed end face and the outer peripheral surface is formed as a rounded corner, the rounded corner is a multi-segment structure, that is, the radius of the arc segments at different positions is different. Such a design has high requirements on the processing technology of the arc surface and the yield rate is also low. In the prior art, there is also a single-segment structure for the rounded corner, but the single-segment rounded corner is the same as the angle between the outer cylindrical surface and the closed end face. This will cause the amount of blowby to be at a higher level. Utility Model Content

[0004] An object of the first aspect of the present utility model is to provide a piston ring to solve the problem of complicated processing technology or large blowby amount of piston ring in the prior art.

[0005] Another object of the first aspect of the utility model is to solve the problem of large blowby amount of the piston ring during long-term use.

[0006] In particular, the utility model provides a piston ring, comprising an opening portion, a top surface and a bottom surface; wherein the opening portion comprises two joint end surfaces;

[0007] A fillet is formed between the joint end face and the outer cylindrical surface, and the cross section of the fillet when cut on the surface of the piston ring parallel to the bottom surface is a single-segment arc with a consistent curvature;

[0008] The angle between the tangent line at the intersection of the circular arc and the outer circular surface and the outer circular surface is greater than the angle between the tangent line at the intersection of the circular arc and the joint end surface and the joint end surface.

[0009] Optionally, an angle α between a tangent line at an intersection of the arc and the outer circular surface and the outer circular surface is 20° to 40°.

[0010] Optionally, an angle γ between a tangent line at an intersection of the arc and the joint end face and the joint end face is in a range of 5° to 15°.

[0011] Optionally, a chamfered portion is formed between the joint end surface and the top surface and / or the bottom surface, and the chamfered portion is an arc surface or a sloped surface.

[0012] Optionally, the arc curvatures at different positions of the cross section of the arc surface are the same.

[0013] Optionally, the radius of the cross section of the arc surface ranges from 0.02 mm to 0.2 mm.

[0014] Optionally, the angle β between the inclined surface and the joint end surface is 20° to 30°.

[0015] Optionally, a size of a right-angled side of a right-angled triangle formed by the cross-sections of the inclined surface, the joint end surface and the top surface is 0.02 mm to 0.2 mm.

[0016] Optionally, a size of a right-angled side of a right-angled triangle formed by the cross-sections of the inclined surface, the joint end surface and the bottom surface is 0.02 mm to 0.2 mm.

[0017] The piston ring of the present solution may include an opening, a top surface, a bottom surface and an outer cylindrical surface, and the opening may include two joint end surfaces. A fillet is formed between the joint end surface and the outer cylindrical surface, and the cross section of the fillet after cutting the surface of the piston ring parallel to the bottom surface is a single-segment arc with consistent curvature. This can simplify the processing technology of the piston ring, reduce costs, and increase the yield rate. In addition, the angle between the tangent at the intersection of the arc and the outer cylindrical surface and the outer cylindrical surface of the present solution is greater than the angle between the tangent at the intersection of the arc and the joint end surface and the joint end surface, which can achieve a better effect of reducing the amount of blowby, reduce the deterioration of the engine oil caused by the scouring of high-temperature combustion gas, and extend the service life of the engine oil.

[0018] The piston ring of this solution may include an opening, a top surface, and a bottom surface. A first chamfered portion is formed between the two joint end faces of the opening and the top surface and / or the bottom surface. Through the first chamfered portion, the friction between the joint end face and the top and / or bottom surface at the transition during long-term movement along the circumferential surface of the ring groove can be effectively reduced, thereby reducing the plowing grooves generated by the friction against the top or bottom of the ring groove, further reducing the wear of the piston ring and the ring groove during long-term movement, decreasing the oil consumption and blow-by gas volume after long-term durable movement, and enabling the blow-by gas volume to be maintained at a relatively low level during long-term movement of the piston ring.

[0019] The first chamfered portion of this solution can be a circular arc surface chamfer or an inclined surface chamfer. Regardless of which form, it can reduce the damage to the piston ring and the ring groove during long-term movement of the piston ring, and further reduce the blow-by gas volume of the piston ring during long-term movement.

[0020] This solution not only forms a chamfered portion between the two joint end faces and the top surface and / or the bottom surface, but also forms a rounded corner between the joint end face and the outer circumferential surface, which can effectively reduce the blow-by gas volume of the piston ring at the initial stage, and reduce the wear of the piston ring or the piston after long-term movement of the piston ring, so that the blow-by gas volume of the piston ring remains at a relatively low level during long-term movement.

[0021] From the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more clear about the above and other objects, advantages, and features of the present invention. Description of the Drawings

[0022] Some specific embodiments of the present invention will be described in detail hereinafter with reference to the accompanying drawings in an exemplary but not restrictive manner. The same reference numerals in the drawings denote the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0023] Figure 1 is a schematic structural diagram of a piston ring according to a specific embodiment of the present invention;

[0024] Figure 2 is a partially enlarged schematic view of a piston ring according to a specific embodiment of the present invention;

[0025] Figure 3 is according to a specific embodiment of the present invention in accordance with Figure 2 the schematic cross-sectional view taken along A-A in;

[0026] Figure 4 is according to a specific embodiment of the present invention in accordance with Figure 2 the schematic cross-sectional view taken along B-B in;

[0027] Figure 5According to another specific embodiment of the utility model Figure 2 A schematic cross-sectional view after cutting BB in FIG.

[0028] Figure 6 According to another specific embodiment of the utility model Figure 2 A schematic cross-sectional view after cutting BB in FIG.

[0029] Figure 7 According to another specific embodiment of the utility model Figure 2 Schematic cross-sectional view after cutting through BB in FIG.

[0030] Description of reference numerals:

[0031] Piston ring 100; opening 110; joint end face 111; top face 120; bottom face 130; chamfered portion 140; arc face 141; inclined face 142; outer cylindrical face 150; fillet 160. DETAILED DESCRIPTION

[0032] 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.

[0033] As a specific embodiment of the present invention, Figure 1 and Figure 2 As shown, this embodiment discloses a piston ring 100, which may include an opening 110, an outer cylindrical surface 150, a top surface 120 and a bottom surface 130. Among them, the opening 110 may include two joint end surfaces 111. A fillet 160 is formed between the joint end surface 111 and the outer cylindrical surface 150, and the cross-section of the fillet 160 after cutting the surface of the piston ring 100 parallel to the bottom surface 130 is a single-segment arc with consistent curvature. The angle between the tangent line at the intersection of the arc and the outer cylindrical surface 150 and the outer cylindrical surface 150 is greater than the angle between the tangent line at the intersection of the arc and the joint end surface 111 and the joint end surface 111.

[0034] Specifically, the piston ring 100 of this embodiment may include an opening 110, a top surface 120, a bottom surface 130 and an outer cylindrical surface 150, and the opening 110 may include two joint end surfaces 111. A fillet 160 is formed between the joint end surface 111 and the outer cylindrical surface 150, and the cross section of the fillet 160 after cutting the surface of the piston ring 100 parallel to the bottom surface 130 is a single-segment arc with a consistent curvature. In this way, the processing technology of the piston ring can be simplified, the cost can be reduced, and the yield rate can be increased. In addition, the angle between the tangent line at the intersection of the arc and the outer cylindrical surface 150 and the outer cylindrical surface 150 of this embodiment is greater than the angle between the tangent line at the intersection of the arc and the joint end surface 111 and the joint end surface 111, which can achieve a better effect of reducing the amount of blowby, reduce the deterioration of the engine oil caused by the scouring of high-temperature combustion gas, and extend the service life of the engine oil.

[0035] In addition, the chamfered portion 160 of this embodiment is designed in the form of an arc to avoid the coating on the outer cylindrical surface 150 of the piston ring 100 from falling off during processing, while achieving a better effect of reducing the amount of blowby, reducing the deterioration of the engine oil caused by the erosion of high-temperature combustion gas, and extending the service life of the engine oil.

[0036] As a specific embodiment of the present invention, Figure 3 As shown, in this embodiment, the angle α between the tangent line at the intersection of the arc and the outer circular surface 150 and the outer circular surface 150 is 20° to 40°. For example, the angle α may be 20°, 30° or 40°.

[0037] As a specific embodiment of the present invention, the angle γ formed between the tangent line at the intersection of the arc and the joint end face 111 and the joint end face 111 is 5° to 15°. For example, the angle γ can be 5°, 10° or 15°.

[0038] Specifically, in this embodiment, although the fillet 160 is a single-stage arc, the angle ranges of the angle α between the arc and the outer cylindrical surface 150 and the angle γ between the arc and the joint end surface 111 are different. The angle α between the arc and the outer cylindrical surface 150 is greater than the angle α between the arc and the joint end surface 111. Such a design makes the piston ring 100 have a good anti-blowby effect, simple processing, and low cost. In addition, a better effect of reducing the amount of blowby can be obtained, reducing the deterioration of the engine oil caused by the scouring of high-temperature combustion gas, and extending the service life of the engine oil.

[0039] As a specific embodiment of the present invention, Figure 2 As shown, in this embodiment, a chamfered portion 140 is formed between the joint end surface 111 and the top surface 120 and / or the bottom surface 130 , and the chamfered portion 140 is an arc surface or an inclined surface.

[0040] In this embodiment, the chamfered portion 140 can effectively reduce the plowing grooves generated by the friction between the top or bottom of the ring groove and the transition between the joint end face 111 and the top face 120 and / or the bottom face 130 during long-term movement along the circumferential surface of the ring groove, thereby reducing the wear of the piston ring 100 and the ring groove during long-term movement, decreasing the oil consumption and blow-by gas volume after long-term durable movement, and keeping the blow-by gas volume at a relatively low level during the long-term movement of the piston ring 100.

[0041] Specifically, in one embodiment, a chamfered portion 140 is provided between one of the joint end faces 111 and the top face 120, and no chamfered portion 140 is provided elsewhere. In another specific embodiment, a chamfered portion 140 is provided between one of the joint end faces 111 and the bottom face 130, and no chamfered portion 140 is provided at other positions. In another specific embodiment, chamfered portions 140 are provided between both joint end faces 111 of the piston ring 100 and the bottom face 130 (as Figure 4 shown), and no chamfered portion 140 is provided at other positions. Of course, in other embodiments, chamfered portions 140 may also be provided between both joint end faces 111 of the piston ring 100 and the top face 120, and no chamfered portion 140 is provided at other positions. In yet another embodiment, a chamfered portion 140 is provided between one of the joint end faces 111 and the top face 120, and a chamfered portion 140 is provided between the other joint end face 111 and the bottom face 130, and no first chamfered portion 140 is provided at other positions. In yet another embodiment, a chamfered portion 140 is provided between one of the joint end faces 111 and both the top face 120 and the bottom face 120, and no chamfered portion 140 is included at other positions (as Figure 5 shown). In a preferred embodiment, chamfered portions 140 are provided between both joint end faces 111 of the piston ring 100 and both the top face 120 and the bottom face 130 (as Figure 6 shown). Specifically, the position and number of the chamfered portions 140 can be designed according to the actual situation.

[0042] As a specific embodiment of the present invention, the first chamfered portion 140 of this embodiment is an arc surface 141 (as Figures 4 - 6 shown) or an inclined surface 142 (as Figure 7 shown).

[0043] Specifically, the chamfered portion 140 of this embodiment can be an arc surface 141 chamfer or an inclined surface 142 chamfer (as Figure 7 shown). No matter which form it is, it can reduce the damage to the piston ring 100 and the ring groove during the long-term movement of the piston ring 100, and further reduce the blow-by gas volume of the piston ring 100 during long-term movement.

[0044] Specifically, in this embodiment, if the chamfered portion 140 is a circular arc surface 141, the radius of the cross section of the circular arc surface 141 ranges from 0.02 mm to 0.2 mm. For example, the radius of the cross section of the circular arc surface 141 can range from 0.02 mm, 0.1 mm or 0.2 mm. Since the design of the chamfered portion 140 will increase the size of the leakage channel, thereby increasing the amount of blowby, the size of the chamfered portion 140 is not easy to be too large. In this way, although the amount of blowby increases in a short period of time compared to not adding the chamfered portion 140, after long-term use, the presence of the chamfered portion 140 reduces the wear of the piston ring 100 and the piston, thereby reducing the amount of blowby during long-term movement, so that the amount of blowby of the piston ring 100 during long-term movement is maintained at a low level.

[0045] As a specific embodiment of the present invention, the arc curvatures of different positions of the cross section of the arc surface 141 of the chamfered portion 140 of this embodiment are the same.

[0046] Specifically, the arc surface 141 of the chamfered portion 140 in this embodiment has the same cross-sectional arc curvature, indicating that the arc is a single-stage arc. Compared with the multi-stage arc surface 141, the arc surface 141 of the chamfered portion 140 in this embodiment has low process requirements, low cost, and high yield.

[0047] As a specific embodiment of the present invention, Figure 7 As shown, the angle β between the inclined surface 142 of the chamfered portion 140 and the joint end surface 111 of this embodiment is 20° to 30°. For example, β can be 20°, 25° or 30°.

[0048] As a specific embodiment of the utility model, the size of the right angle side of the right triangle formed by the cross section of the inclined surface 142, the joint end surface 111 and the top surface 120 of this embodiment is 0.02mm-0.2mm. And / or the size of the right angle side of the right triangle formed by the cross section of the inclined surface 142, the joint end surface 111 and the bottom surface 130 is 0.02mm-0.2mm.

[0049] For example, the side length of the right triangle may be 0.02 mm, 0.1 mm or 0.2 mm.

[0050] Specifically, the angle of the bevel 142 of this embodiment, the right-angled triangle formed between the joint end face 111 and the bottom surface 130 or the top surface 120 is 20°~40°, and the size of the right-angle side is designed to be 0.02mm~0.2mm, which can reduce the total area of the initial air leakage channel of the piston ring 100 as much as possible, achieve a lower blowby amount during initial operation, and maintain a low blowby amount after long-term operation.

[0051] At this point, those skilled in the art should recognize that although numerous exemplary embodiments of the present utility model have been shown and described in detail herein, many other variations or modifications that conform to the principles of the present utility model can still be directly determined or derived based on the content disclosed in the present utility model without departing from the spirit and scope of the present utility model. Therefore, the scope of the present utility model should be understood and determined to cover all such other variations or modifications.

Claims

1. A piston ring, characterized in that, It includes an opening part, an outer circular surface, a top surface and a bottom surface; wherein, two joint end faces are included at the opening part; A fillet is formed between the joint end face and the outer circular surface, and the cross-section of the fillet after being cut along the plane parallel to the bottom surface of the piston ring is a single-segment circular arc with a consistent curvature; The included angle between the tangent line at the intersection of the circular arc and the outer circular surface and the outer circular surface is greater than the included angle between the tangent line at the intersection of the circular arc and the joint end face and the joint end face.

2. The piston ring according to claim 1, characterized in that The included angle α between the tangent line at the intersection of the circular arc and the outer circular surface and the outer circular surface is 20° to 40°.

3. The piston ring according to claim 2, characterized in that The range of the included angle γ between the tangent line at the intersection of the circular arc and the joint end face and the joint end face is 5° to 15°.

4. The piston ring according to any one of claims 1-3, characterized in that A chamfering part is formed between the joint end face and the top surface and / or the bottom surface, and the chamfering part is an arc surface or an inclined surface.

5. The piston ring according to claim 4, characterized in that The circular arc curvatures at different positions of the cross-section of the arc surface are the same.

6. The piston ring according to claim 4, characterized in that The radius range of the cross-section of the arc surface is 0.02 mm to 0.2 mm.

7. The piston ring according to claim 4, characterized in that The included angle β between the inclined surface and the joint end face is 20° to 30°.

8. The piston ring according to claim 4, characterized in that The dimension of the right-angle side of the right-angled triangle formed by the cross-sections of the inclined surface, the joint end face and the top surface is 0.02 mm to 0.2 mm.

9. The piston ring according to claim 4, characterized in that The dimension of the right-angle side of the right-angled triangle formed by the cross-sections of the inclined surface, the joint end face and the bottom surface is 0.02 mm to 0.2 mm.

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