Piston ring and engine

Abstract

The utility model discloses a piston ring and an engine, the piston ring comprises an outer ring body, the inner ring side of the outer ring body is provided with a limiting caulking groove, and the outer ring side of the outer ring body is used for being matched with an air cylinder of the engine; and at least part of the inner ring body is embedded into the limiting embedding groove, and the inner ring body is used for pushing the outer ring body to expand outwards in the radial direction. After the inner ring body is embedded into the limiting caulking groove, elastic force can be applied to the outer ring body, the outer ring body can apply elastic force to the air cylinder through elastic deformation of the outer ring body, and therefore the total elastic force applied to the air cylinder by the piston ring is the sum of the two elastic forces. When resisting knocking, even if the elastic force of the outer ring body is reduced under the knocking effect, the inner ring body can ensure that the inner ring body has enough elastic force to play a sealing role, so that larger residual elastic force can be achieved. Meanwhile, a part of the inner ring body extends into the limiting caulking groove, the outer ring body can protect the inner ring body, knocking shock waves are prevented from directly impacting the inner ring body, and it is guaranteed that the inner ring body does not generate plastic deformation or hardly generates plastic deformation, so that the problems of elasticity reduction, necking and the like are solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of engines, and more particularly to a piston ring and an engine. BACKGROUND

[0002] A piston ring is a metal ring used to fit inside a groove in the piston. There are two types of piston rings: compression rings and oil rings. Compression rings seal the combustion gases in the combustion chamber. Oil rings scrape excess oil from the cylinder wall. Piston rings are widely used in various power machines, such as steam engines, diesel engines, gasoline engines, compressors, hydraulic machines, etc., and are widely used in automobiles, trains, ships, yachts, etc.

[0003] At present, the piston ring can only resist the impact force caused by knocking by its own stiffness in the knocking condition. In the high-temperature state, the material performance decreases, the strong shock wave generated by knocking causes plastic deformation of the piston ring, the elastic force of the piston ring decreases, the sealing capacity decreases, and problems such as large air leakage and piston necking occur.

[0004] Therefore, how to provide sufficient sealing elastic force when plastic deformation occurs, reduce the risk of poor sealing of the piston ring in the knocking condition, and improve the reliability of the engine is a problem to be solved by those skilled in the art. CONTENT OF THE INVENTION

[0005] Therefore, the purpose of the present application is to provide a piston ring that can provide sufficient sealing elastic force when plastic deformation occurs, reduce the risk of poor sealing of the piston ring in the knocking condition, and improve the reliability of the engine.

[0006] Another purpose of the present application is to provide an engine with the above-mentioned piston ring.

[0007] To achieve the above-mentioned purposes, the present application provides the following technical solutions.

[0008] The first aspect of the present application provides a piston ring, which comprises:

[0009] An outer ring body, the inner ring side of the outer ring body has a limiting groove, and the outer ring side of the outer ring body is used to cooperate with the cylinder of the engine;

[0010] An inner ring body, at least partially embedded in the limiting groove, the inner ring body is used to push the outer ring body to expand radially outward.

[0011] In one possible implementation, the part of the inner ring body that is in contact with the outer ring body is an inner ring body contact part, and the part of the outer ring body that is in contact with the inner ring body is an outer ring body contact part.

[0012] In a natural state, the diameter of the inner ring body fitting portion is greater than the diameter of the outer ring body fitting portion fitted with the inner ring body fitting portion.

[0013] In a possible implementation, the outer ring body has a first boundary portion and a second boundary portion arranged at intervals along the axial direction, and the limiting groove is located between the first boundary portion and the second boundary portion.

[0014] In a possible implementation, the inner ring body comprises an inner ring main body portion and an inner ring embedded portion located radially outside the inner ring main body portion, and the inner ring embedded portion is embedded in the limiting groove.

[0015] In a possible implementation, the inner ring embedded portion is formed with an oil film storage gap between the first boundary portion and the second boundary portion.

[0016] and / or,

[0017] The inner ring main body portion is formed with an oil film storage gap between the first boundary portion and the second boundary portion.

[0018] In a possible implementation, the axial thickness of the inner ring body at any position in the radial direction is equal, and the outer ring side of the inner ring body is at least partially embedded in the limiting groove.

[0019] In a possible implementation, the inner ring body is formed with an oil film storage gap between the first boundary portion and the second boundary portion.

[0020] In a possible implementation, the outer ring body is formed with a piston ring opening between two end portions, and the boundaries of the two ends of the limiting groove have a preset distance from the corresponding end portions of the outer ring body.

[0021] In a possible implementation, the cross-sectional shape of the limiting groove is polygonal, circular arc-shaped, or elliptical arc-shaped.

[0022] The piston ring provided by the application is divided into two parts, namely an outer ring body and an inner ring body, at least part of the structure of the inner ring body is embedded in the limiting embedding groove of the outer ring body, and the connection between the inner ring body and the outer ring body is realized. After the inner ring body is embedded in the limiting embedding groove, the outer ring body can be expanded outward along the radial direction, that is, the elastic force can be applied to the outer ring body, and the outer ring body can apply elastic force to the cylinder by elastic deformation, so that the total elastic force applied to the cylinder by the piston ring is the sum of the two elastic forces. When resisting knock, even if the elastic force of the outer ring body decreases under the action of knock, the inner ring body can ensure sufficient elastic force for sealing, so that there is more residual elastic force. At the same time, part of the inner ring body is embedded in the limiting embedding groove, and the outer ring body can protect the inner ring body from being directly impacted by the shock wave of knock, so that the inner ring body will not or less likely to have problems such as plastic deformation, elastic force decrease and necking. The application can provide sufficient sealing elastic force, reduce the risk of sealing failure of the piston ring under knock, and improve the reliability of the engine.

[0023] The second aspect of the application provides an engine comprising the piston ring according to any one of the above.

[0024] The engine provided by the application has all the technical effects of the piston ring described above, and details are not repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0026] Figure 1 The cross-sectional view of the piston ring disclosed in the embodiments of the application;

[0027] Figure 2 The cross-sectional view of the outer ring body disclosed in the embodiments of the application;

[0028] Figure 3 The cross-sectional view of the inner ring body disclosed in the embodiments of the application;

[0029] Figure 4 The top view of the outer ring body disclosed in the embodiments of the application;

[0030] Figure 5 The cross-sectional view of the piston ring disclosed in another embodiment of the application.

[0031] The meanings of various reference signs in the drawings are as follows:

[0032] 100 - outer ring body; 101 - limiting slot; 1011 - boundary; 102 - first boundary part; 103 - second boundary part; 104 - piston ring opening;

[0033] 200 - inner ring body; 201 - inner ring main part; 202 - inner ring embedding part;

[0034] 300 - oil storage film gap. DETAILED DESCRIPTION

[0035] The core of the present application is to provide a piston ring that can still provide sufficient sealing spring force when plastic deformation occurs, reduce the risk of poor sealing of the piston ring under knock conditions, and improve the reliability of the engine.

[0036] Another core of the present application is to provide an engine with the above piston ring.

[0037] Hereinafter, embodiments will be described with reference to the accompanying drawings. In addition, the embodiments shown below do not have any limiting effect on the application content recited in the claims. In addition, the entire content of the configuration represented in the following embodiments is not limited to what is necessary as a solution to the application recited in the claims. Note that, for the sake of convenience of description, only the parts related to the application are shown in the drawings. In the case where there is no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0038] Knock is an abnormal combustion state of the engine, and the in-cylinder pressure appears high-frequency and large-amplitude fluctuations, and the temperature in the combustion chamber is abnormally high, which will produce a huge impact force on the piston and the piston ring. The diameter of the piston ring in the free state will be larger than the inner diameter of the cylinder, and when installed, the diameter of the piston ring is reduced to generate a spring force to keep the piston ring adhered to the inner wall of the cylinder under the action of the spring force of the piston ring, so as to realize sealing. The strong shock wave generated by knock will cause plastic deformation of the piston ring, resulting in a decrease in the spring force of the piston ring and a decrease in the sealing ability, causing large air leakage and piston necking problems.

[0039] Based on this, the present application discloses a piston ring, as shown in Figure 1 and Figure 5 The piston ring disclosed in the embodiments of the present application includes an outer ring body 100 and an inner ring body 200. The outer ring body 100 is used to cooperate with the cylinder of the engine on the outer ring side, so as to adhere to the inner wall of the cylinder by using its own spring force, to realize the sealing connection with the cylinder body. The inner ring body 200 is sleeved on the piston body on the inner ring side, that is, the inner ring body 200 is sleeved in the piston ring groove of the piston body, to realize the installation of the piston ring on the piston body.

[0040] The inner ring side of the outer ring body 100 has a limiting slot 101, and the shape of the limiting slot 101 is not limited as long as the positioning and protection of the inner ring body 200 can be achieved. The inner ring body 200 is at least partially embedded in the limiting slot 101, that is, the inner ring body 200 can be entirely embedded in the limiting slot 101, or only a part of the structure can be embedded in the limiting slot 101.

[0041] The inner ring body 200 is used to push the outer ring body 100 to expand radially outward, that is, the outer diameter of the part of the inner ring body 200 embedded in the limiting slot 101 is greater than the inner diameter of the limiting slot 101 in the natural state, so that after the inner ring body 200 is embedded in the limiting slot 101 under pressure, the elastic force acting on the outer ring body 100 can be generated to push the outer ring body 100 to expand radially outward.

[0042] The piston ring provided in the application is divided into two parts, namely the outer ring body and the inner ring body, and at least a part of the structure of the inner ring body is embedded in the limiting slot of the outer ring body to realize the connection of the inner ring body and the outer ring body. After the inner ring body is embedded in the limiting slot, the outer ring body can be pushed to expand radially outward, that is, the elastic force can be applied to the outer ring body, and the elastic deformation of the outer ring body can exert an elastic force on the cylinder, so the total elastic force exerted by the piston ring on the cylinder is the sum of the two elastic forces. When resisting knock, even if the elastic force of the outer ring body decreases under the action of knock, the inner ring body can ensure sufficient elastic force for sealing, so that there will be more residual elastic force. At the same time, a part of the inner ring body is deeply embedded in the limiting slot, and the outer ring body can protect the inner ring body to prevent the knock shock wave from directly impacting the inner ring body, so that the inner ring body will not or less likely to have problems such as plastic deformation, elastic force drop, and necking. The application can provide sufficient sealing elastic force, reduce the risk of poor sealing of the piston ring under knock, and improve the reliability of the engine.

[0043] For ease of understanding, the part of the inner ring body 200 that is attached to the outer ring body 100 is defined as the inner ring body attachment part, and the part of the outer ring body 100 that is attached to the inner ring body 200 is defined as the outer ring body attachment part. In the natural state (referring to the state of the inner ring body 200 and the outer ring body 100 when they are not deformed under force), the diameter of the inner ring body attachment part is greater than the diameter of the outer ring body attachment part attached to the inner ring body attachment part. It should be noted that in the natural state, the diameter of the attachment part of the inner ring body attachment part and the outer ring body attachment part refers to the part that can exert a force to expand the outer ring body 100 radially outward due to the mutual attachment of the two parts.

[0044] When the inner ring body 200 is mounted to the outer ring body 100, the outer ring body 100 is compressed and deformed, and an elastic force F1 is generated, thereby increasing the elastic force of the outer ring body 100; when the outer ring body 100 is mounted, an elastic force F2 acting on the cylinder body is generated, the total elastic force F of the piston ring acting on the cylinder body is F1+F2, which is greater than the elastic force generated by the piston ring with the same thickness, and there is a greater residual elastic force when resisting knock, and at the same time, a part of the inner ring body 200 extends into the limiting groove 101, preventing the knock shock wave from directly impacting, and ensuring that the inner ring body 200 will not be plastically deformed to cause the elastic force to decrease.

[0045] As shown in Figure 2 , the first boundary portion 102 and the second boundary portion 103 are arranged at intervals along the axial direction of the outer ring body 100, and the limiting groove 101 is located between the first boundary portion 102 and the second boundary portion 103. After the inner ring body 200 is mounted to the outer ring body 100, the part of the inner ring body 200 embedded in the limiting groove 101 can be protected by the first boundary portion 102 and the second boundary portion 103, preventing the knock shock wave from directly impacting.

[0046] In this embodiment, the first boundary portion 102 and the second boundary portion 103 can be only one, i.e., there is only one limiting groove 101; the first boundary portion 102 and the second boundary portion 103 can also be provided in multiple groups, each group of the first boundary portion 102 and the second boundary portion 103 surrounds one limiting groove 101, and then the inner ring body 200 can also be provided with an embedded part corresponding to the limiting groove 101.

[0047] As shown in Figure 3 , in a specific embodiment of the present application, the inner ring body 200 includes an inner ring main body portion 201 and an inner ring embedded portion 202 located radially outside the inner ring main body portion 201, and the inner ring embedded portion 202 is embedded in the limiting groove 101. Since the inner ring embedded portion 202 needs to be embedded in the limiting groove 101, and the inner ring main body portion 201 is located outside the limiting groove 101, the thickness dimension of the inner ring embedded portion 202 along the axial direction of the piston ring is smaller than the thickness dimension of the inner ring main body portion 201 along the axial direction of the piston ring, so that the inner ring main body portion 201 can be located outside the limiting groove 101.

[0048] As shown in Figure 1 , the thickness of the inner ring main body portion 201 can be the same as the thickness of the outer ring body 100, so that after the inner ring embedded portion 202 is embedded in the limiting groove 101, the two end faces of the inner ring main body portion 201 located outside the limiting groove 101 along the axial direction are coplanar with the two end faces of the outer ring body 100 along the axial direction.

[0049] It should be noted that the outer side of the inner ring main body portion 201 can be in contact with the inner side of the first boundary portion 102 and the second boundary portion 103, or there can be a certain gap, and this embodiment does not limit it.

[0050] In an embodiment of the present application, the oil film gap 300 is formed between the inner ring embedding portion 202 and the first boundary portion 102 and the second boundary portion 103. In addition, the oil film gap 300 can also be formed between the inner ring body portion 201 and the first boundary portion 102 and the second boundary portion 103.

[0051] That is, in the present embodiment, the oil film gap 300 exists between the two side walls of the limiting embedding groove 101 and the inner ring embedding portion 202, and a certain amount of oil film exists in the oil film gap 300. The oil film can effectively weaken the knock impact transmitted by the outer ring body 100, further reduces the probability of plastic deformation of the inner ring body 200, so that the inner ring body 200 can continuously output the elastic force to the outer ring body 100, so that the outer ring body 100 can expand outward to ensure the sealing performance.

[0052] As shown in the drawings, Figure 5 In another embodiment of the present application, the axial thickness of any position of the inner ring body 200 in the radial direction is equal, that is, in the present embodiment, the thickness of any position of the inner ring body 200 in the radial direction is equal. Compared with the previous embodiment, it can be understood that in the present embodiment, the inner ring body 200 does not have the inner ring body portion 201, but only includes the inner ring embedding portion 202.

[0053] The outer ring side of the inner ring body 200 is at least partially embedded in the limiting embedding groove 101. That is, the inner ring body 200 can be entirely embedded in the limiting embedding groove 101, or can be partially embedded in the limiting embedding groove 101, and the other part is exposed outside the limiting embedding groove 101. Whether the inner ring body 200 has the inner ring body portion 201 does not affect the application of the elastic force to the outer ring body 100, and does not affect the limiting embedding groove 101 having the function of protecting the inner ring body 200, thereby reducing the risk of sealing failure caused by the decrease of the elastic force of the outer ring body 100.

[0054] On the basis of the above-mentioned embodiments, the oil film gap 300 can also be formed between the inner ring body 200 and the first boundary portion 102 and the second boundary portion 103. The oil film gap 300 exists between the two side walls of the limiting embedding groove 101 and the inner ring body 200, and a certain amount of oil film exists in the oil film gap 300. The oil film can effectively weaken the knock impact transmitted by the outer ring body 100, further reduces the probability of plastic deformation of the inner ring body 200, so that the inner ring body 200 can continuously output the elastic force to the outer ring body 100, so that the outer ring body 100 can expand outward to ensure the sealing performance.

[0055] As shown in the drawings, Figure 4As shown, in an embodiment of the present application, the piston ring opening 104 is formed between the two ends of the outer ring body 100, and the boundary 1011 of the two ends of the limiting slot 101 has a preset distance from the corresponding end of the outer ring body 100. That is, the boundary 1011 of the first end of the limiting slot 101 has a preset distance from the end face of the first end of the outer ring body 100, and the boundary 1011 of the second end of the limiting slot 101 has a preset distance from the end face of the second end of the outer ring body 100.

[0056] The distance between the two ends of the limiting slot 101 and the corresponding end of the outer ring body 100 can be equal or not equal, which can be designed according to requirements. The central angle of the inner ring body 200 is smaller than that of the outer ring body 100, and when the inner ring body 200 is embedded in the limiting slot 101, the inner ring body 200 is completely hidden in the coverage range of the outer ring body 100 in the circumferential direction, thereby providing better protection for the inner ring body 200.

[0057] In the embodiment, the central angle of the limiting slot 101 can be -175°~175°, that is, the central angle of the inner ring body 200 can be -175°~175°. In the embodiment, the limiting slot 101 does not penetrate the end of the outer ring body 100, which can increase the rigidity of the opening of the outer ring body 100 and prevent the risk of collapse at the opening, and can also limit the rotation of the inner ring body 200.

[0058] In the embodiment, the cross-sectional shape of the limiting slot 101 can be polygonal, circular arc, or elliptical arc. In the embodiment, the cross-sectional shape of the limiting slot 101 is not limited to the shapes disclosed above, and those skilled in the art can select the cross-sectional shape of the limiting slot 101 according to requirements.

[0059] The embodiment of the present application also discloses an engine, which comprises the piston ring disclosed in the above embodiment. Since the engine has the piston ring, all the technical effects of the piston ring are achieved, which will not be described herein again.

[0060] As shown in the present application and claims, unless the context clearly indicates otherwise, the words "one", "an", "a", and / or "the" do not mean a single number, but also include plural. Generally, the terms "include" and "contain" only indicate that the steps and elements explicitly identified are included, and these steps and elements do not constitute an exclusive list, and the method or device can also include other steps or elements. The element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, product or device including the element.

[0061] In the description of the present application, the words such as setting, installing, connecting and the like should be understood in a broad sense unless otherwise explicitly defined, and the specific meanings of the above words in the present application can be reasonably determined by those skilled in the art in combination with the specific content of the technical solutions.

[0062] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be mutually referred to.

[0063] The principles and implementation modes of the present application are described by applying specific examples herein. The above description of the embodiments is only used to help understand the method of the present application and its core idea. It should be pointed out that, for those skilled in the art, without departing from the principles of the present application, some improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A piston ring, characterized in that, include: An outer ring body (100) has a limiting groove (101) on its inner ring side, and the outer ring side of the outer ring body (100) is used to cooperate with the cylinder of the engine. The inner ring (200) is at least partially embedded in the limiting groove (101), and the inner ring (200) is used to push the outer ring (100) to expand radially outward.

2. The piston ring as described in claim 1, characterized in that, The portion of the inner ring body (200) that is attached to the outer ring body (100) is the inner ring body attachment portion, and the portion of the outer ring body (100) that is attached to the inner ring body (200) is the outer ring body attachment portion; In its natural state, the diameter of the inner ring body fitting portion is larger than the diameter of the outer ring body fitting portion that is fitted with the inner ring body fitting portion.

3. The piston ring as described in claim 1, characterized in that, The outer ring body (100) has a first boundary portion (102) and a second boundary portion (103) arranged at intervals along the axial direction, and the limiting groove (101) is located between the first boundary portion (102) and the second boundary portion (103).

4. The piston ring as described in claim 3, characterized in that, The inner ring body (200) includes an inner ring main body (201) and an inner ring embedding part (202) located radially outside the inner ring main body (201), the inner ring embedding part (202) being embedded in the limiting groove (101).

5. The piston ring as described in claim 4, characterized in that, An oil storage film gap (300) is formed between the inner ring embedded part (202) and the first boundary part (102) and the second boundary part (103). And / or, An oil storage film gap (300) is formed between the inner ring main body (201) and the first boundary part (102) and the second boundary part (103).

6. The piston ring as described in claim 3, characterized in that, Along the radial direction, the axial thickness of the inner ring body (200) is equal at any position, and the outer ring side of the inner ring body (200) is at least partially embedded in the limiting groove (101).

7. The piston ring as described in claim 6, characterized in that, An oil storage film gap (300) is formed between the inner ring (200) and the first boundary portion (102) and the second boundary portion (103).

8. The piston ring according to any one of claims 1-7, characterized in that, A piston ring opening (104) is formed between the two ends of the outer ring body (100), and the boundaries (1011) of the two ends of the limiting groove (101) are at a predetermined distance from the corresponding ends of the outer ring body (100).

9. The piston ring according to any one of claims 1-7, characterized in that, The cross-sectional shape of the limiting groove (101) is polygonal, circular arc or elliptical arc.

10. An engine, characterized in that, Including the piston ring as described in any one of claims 1-9.

Images