Piston ring capable of reducing friction loss

Abstract

The utility model relates to the technical field of piston, concretely is a kind of piston ring that can reduce friction loss, including piston ring, the top and bottom of piston ring are provided with first recess, the first recess is used to reduce the contact area of piston ring after installation with upper and lower surface, the outside wall of piston ring is provided with second recess.The first recess of top, bottom and the second recess of outside wall, respectively reduce the contact area of piston ring and piston ring groove upper end surface, cylinder inner wall, the reduction of contact area is the core logic of reducing friction, can reduce the friction resistance when piston reciprocating from source, the diameter difference of second recess and first recess avoids structural interference, realizes balance between reducing friction and preserving structure, neither affect sealing performance, can also let friction loss be greatly reduced compared with traditional piston ring, the DLC coating of outer layer itself has very low friction coefficient, match the reduced contact design of recess, form better friction-reducing effect.

Description

Technical Field

[0001] This utility model relates to the field of piston technology, specifically to a piston ring that can reduce frictional loss. Background Technology

[0002] Piston rings are metal ring-shaped parts installed in the piston annular groove in an internal combustion engine. They are key components for achieving the three core functions of sealing, heat conduction, and oil control, and directly affect the engine's power, fuel consumption, and service life.

[0003] Originally, the top, bottom, and outer walls of piston rings were mostly flat structures without grooves to reduce the contact area. This resulted in a large contact area with the upper and lower surfaces of the piston ring grooves and the cylinder wall, leading to significantly higher frictional resistance during piston reciprocating motion. This not only consumes a large amount of engine power but also wastes internal energy, indirectly increasing fuel consumption. The impact of frictional losses on power output is particularly pronounced at high speeds. Utility Model Content

[0004] The purpose of this invention is to provide a piston ring that can reduce frictional loss, thereby solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a piston ring that can reduce frictional loss, comprising a piston ring, wherein the top and bottom of the piston ring are provided with a first groove, the first groove being used to reduce the contact area between the piston ring and the top and bottom surfaces after installation;

[0006] The outer wall of the piston ring is provided with a second groove, which is used to reduce the contact area between the piston ring and the cylinder.

[0007] The second groove has a first rounded corner at its edge and the piston ring has a second rounded corner at its outer corner.

[0008] Preferably, the rounded corners of the first rounded corner and the second rounded corner are different from the rounded corners of the corresponding structures, and the size of the rounded corner corresponding to the second rounded corner is larger than the size of the rounded corner corresponding to the first rounded corner.

[0009] Preferably, the piston ring and the first and second grooves formed on the piston ring are integrally molded structures.

[0010] Preferably, the diameter of the groove corresponding to the second groove is greater than the diameter of the groove corresponding to the first groove.

[0011] Preferably, the cross-section at the notch position of the piston ring is provided with an auxiliary mounting groove.

[0012] Preferably, the edge of the auxiliary mounting groove corresponding to the piston ring has rounded corners.

[0013] Preferably, the piston ring consists of a piston ring body located on the inner layer and a dlc coating located on the outer layer.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] The first groove at the top and bottom, and the second groove on the outer wall, reduce the contact area between the piston ring and the upper and lower end faces of the piston ring groove, and the inner wall of the cylinder, respectively. Reducing the contact area is the core logic for reducing friction, which can reduce the frictional resistance during the reciprocating motion of the piston from the source. The difference in diameter between the second groove and the first groove avoids structural interference, achieving a balance between reducing friction and maintaining the structure. It does not affect the sealing performance and can significantly reduce frictional loss compared to traditional piston rings. The outer DLC coating itself has an extremely low coefficient of friction. Combined with the reduced contact design of the groove, it forms a better friction-reducing effect. The cooperation of the first rounded corner and the second rounded corner can guide the lubricating oil to form a stable oil wedge effect in the groove. The lubricating oil film can cover the friction surface more evenly and reduce the risk of dry friction. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the present utility model. Figure 1 ;

[0017] Figure 2 This is a schematic diagram of the overall structure of the present utility model. Figure 2 ;

[0018] Figure 3 This is a schematic diagram of the cross-sectional structure of the piston ring of this utility model;

[0019] Figure 4 This is a schematic diagram of the piston ring structure of this utility model.

[0020] In the figure: 1. Piston ring; 101. Piston ring body; 102. DLC coating; 2. First groove; 3. Second groove; 4. First fillet; 5. Second fillet; 6. Auxiliary mounting groove. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figures 1 to 4This utility model provides a technical solution: a piston ring that can reduce friction loss. The piston ring 1 has an overall ring structure and adopts a layered composite design, consisting of an inner piston ring body 101 and an outer DLC coating 102. The DLC coating 102 is uniformly covered on the outer surface of the piston ring body 101 and the surface of each groove structure through a physical vapor deposition process, forming a protective layer with both high wear resistance and low friction coefficient.

[0023] The notch of piston ring 1 is an open structure for elastic contraction during assembly. The cross section of the notch is provided with an auxiliary mounting groove 6. The auxiliary mounting groove 6 is recessed inward along the radial direction of piston ring 1, and the connection between it and the edge of piston ring 1 is rounded to avoid coating peeling or damage to the body due to stress concentration during assembly.

[0024] The piston ring body 101 is made of high-strength alloy cast iron or ductile iron, which has good elasticity and heat resistance; the DLC coating 102 is a hydrogen-containing diamond-like carbon coating, which forms a metallurgical bond with the surface of the piston ring body 101 through ion beam deposition process, and can withstand high-frequency friction and impact during piston reciprocating motion.

[0025] The first groove 2 is respectively opened at the top and bottom of the piston ring 1, and has a ring structure along the circumference of the piston ring 1. The groove cross section is semi-circular.

[0026] The second groove 3 is formed on the outer wall of the piston ring 1, that is, the surface in contact with the cylinder. It is closed in the circumferential direction and has a semi-circular cross section. The groove diameter of the second groove 3 (that is, the diameter of the circumference where the bottom of the groove is located) is larger than the groove diameter of the first groove 2 (that is, the diameter of the circumference where the bottom of the groove is located). It is designed according to different friction reduction requirements. The contact position with the cylinder needs to reduce friction more, while ensuring the structural strength of the outer wall.

[0027] The first fillet 4 is located at the edge of the groove 3, i.e. the connection between the groove and the outer wall support surface, to reduce stress concentration at the edge of the groove and reduce shear resistance with the lubricating oil film of the cylinder. The second fillet 5 is located at the corner of the outer wall of the piston ring 1, i.e. the connection between the outer wall and the top and bottom end faces. Its fillet size is larger than that of the first fillet 4, which can prevent rigid scraping between the piston ring and the cylinder during reciprocating motion, and at the same time guide the lubricating oil film to be evenly distributed.

[0028] The auxiliary mounting groove 6 is located at the notch of the piston ring 1. The groove has a circular cross-section, with a shallower inner depth and a deeper outer depth. Its edge and the notch end face of the piston ring 1 are both transitioned by rounded corners. During assembly, a tool can be inserted into the auxiliary mounting groove 6 to facilitate control of the opening expansion of the piston ring and prevent the DLC coating 102 from cracking due to excessive deformation.

[0029] The piston ring 1 body structure is formed by precision casting and CNC grinding in one process to ensure the dimensional accuracy and surface roughness of each groove. After processing, the surface oil and debris are removed by ultrasonic cleaning, and then DLC coating 102 is deposited to completely cover all structural surfaces, including the inside of the grooves and the rounded corners, to ensure the consistency of overall friction performance.

[0030] Working principle:

[0031] Piston ring 1 is installed outside the piston, with the inner wall of piston ring 1 corresponding to the inner wall of the piston. The top and bottom of piston ring 1 correspond to the top and bottom of the groove on the piston ring 1. The first groove 2 at this position reduces the contact area between the top and bottom of piston ring 1 and the top and bottom of the groove on the piston. Without affecting the frictional force between piston ring 1 and piston, the first groove 2 can reduce the frictional force on piston ring 1 under certain conditions. At the same time, a second groove 3 is provided on the outer wall of piston ring 1. The presence of the second groove 3 reduces the relative frictional force between piston ring 1 and cylinder. Meanwhile, piston ring 1 is composed of piston ring body 101 and DLC coating 102. The DLC coating 102 improves the wear resistance of piston ring 1, and the presence of auxiliary mounting groove 6 can assist in the assembly of piston ring 1.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A piston ring that reduces frictional loss, characterized in that: The piston ring includes a first groove at both its top and bottom, which is used to reduce the contact area between the piston ring and its upper and lower surfaces after installation. The outer wall of the piston ring is provided with a second groove, which is used to reduce the contact area between the piston ring and the cylinder. The second groove has a first rounded corner at its edge and the piston ring has a second rounded corner at its outer corner.

2. The piston ring with reduced friction loss according to claim 1, characterized in that: The first rounded corner and the second rounded corner correspond to different rounded corners in the structure, and the size of the second rounded corner is larger than the size of the first rounded corner.

3. A piston ring with reduced friction loss according to claim 2, characterized in that: The piston ring and the first and second grooves formed on the piston ring are both integrally molded structures.

4. A piston ring according to claim 3 that reduces frictional loss, characterized in that: The diameter of the groove corresponding to the second groove is greater than the diameter of the groove corresponding to the first groove.

5. A piston ring with reduced friction loss according to claim 4, characterized in that: An auxiliary mounting groove is provided at the cross-section of the piston ring notch.

6. A piston ring with reduced frictional loss according to claim 5, characterized in that: The edge of the piston ring corresponding to the auxiliary mounting groove is rounded.

7. A piston ring according to claim 6 that reduces frictional loss, characterized in that: The piston ring consists of an inner piston ring body and an outer dlc coating.

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