Piston ring and piston assembly structure and engine

Abstract

The utility model relates to the technical field of piston ring assembly, in particular to a piston ring and piston assembly structure and an engine. In the assembly structure, a thrust block is arranged on the axial side face of the piston ring, and a first set angle is formed between the thrust block and the opening. An annular groove is formed in the piston ring, a thrust groove is formed in the axial side face of the annular groove, a thrust block of the piston ring is clamped in the thrust groove of the annular groove, an installation mark is arranged on the top face of the piston, a second set angle is formed between the projection of the thrust groove on the top face and the installation mark, and the first set angle is equal to the second set angle. According to the assembly structure, the risk that the piston ring is reversely assembled is reduced, opening alignment of the piston ring is avoided, the opening angle of the piston ring does not need to be adjusted when the piston ring is assembled, and the assembly efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of piston ring assembly, in particular to a piston ring and piston assembly structure and an engine. Background Art

[0002] As the core component of the internal combustion engine, the performance and reliability of the engine largely depend on the correct assembly of the piston ring, which undertakes the important tasks of sealing, heat conduction and oil distribution. However, there are many technical challenges in the assembly process of the piston ring, such as identifying the front and back sides of the piston ring, preventing the "matching" problem, and adjusting the opening angle.

[0003] When assembling or overhauling an engine, if the piston ring is not installed correctly, or if the piston ring rotates during long-term operation of the engine, the piston ring will "match", causing engine failure or even failure. In addition, when assembling the piston ring, it is necessary to distinguish the front and back sides and adjust the piston ring opening angle, which reduces assembly efficiency.

[0004] In the prior art, in order to avoid assembly errors that result in reverse installation of the piston ring, a "TOP" mark is generally printed on the piston ring to distinguish the front and back sides (i.e., the top and bottom sides) of the piston ring, and the "TOP" mark faces upward during assembly. At the same time, the angle of the piston ring opening needs to be adjusted according to process requirements, and generally the three piston ring openings are staggered by 120 degrees.

[0005] Therefore, the prior art has the following technical problems:

[0006] 1. The piston ring assembly is not fool-proof, and mainly relies on the printed mark on the piston ring to distinguish the front and back. After wear, the mark may not be clear, and there is a risk of the piston ring being installed upside down.

[0007] 2. The piston rings may be "aligned" due to incorrect installation positions of the piston rings during engine assembly and refurbishment, or the piston rings may rotate during long-term operation of the engine.

[0008] 3. After the piston ring is assembled in the piston ring groove, the angle of the piston ring opening needs to be adjusted, which affects the production rhythm. Utility Model Content

[0009] In view of the deficiencies in the prior art, the purpose of the embodiments of the utility model is to provide a piston ring and piston assembly structure to reduce the risk of reverse installation of the piston ring and avoid "matching" of the piston ring. When assembling the piston ring, there is no need to adjust the angle of the piston ring opening, thereby improving assembly efficiency.

[0010] In order to achieve the above purpose, the embodiment of the utility model provides the following technical solutions:

[0011] A piston ring and piston assembly structure, the piston having an annular groove, the piston ring being installed in the annular groove, the piston ring having an opening on its circumference, the piston ring being provided with a thrust block on its axial side, the thrust block having a first set angle with the opening; the annular groove having a thrust groove on its axial side, the thrust block of the piston ring being clamped in the thrust groove of the annular groove, the top surface of the piston being provided with an installation mark, the thrust groove having a second set angle between its projection on the top surface and the installation mark, wherein the first set angle is equal to the second set angle.

[0012] Optionally, the thrust block is a bump protruding on the axial side surface of the piston ring axially away from the piston ring body, and the thickness of the piston ring at the bump position is greater than the thickness of the piston ring at a position where no bump is set.

[0013] Optionally, the thrust groove is a groove that is concave inwardly along the axial side surface of the annular groove and away from the thrust groove in the axial direction, and the distance from the groove bottom to the opposite side of the annular groove is greater than the axial groove width of the annular groove.

[0014] Optionally, the cross section of the protrusion is rectangular, the cross section of the groove is also rectangular, and the width of the protrusion along the circumferential direction is smaller than the width of the groove along the circumferential direction.

[0015] Optionally, a guide angle is provided at one end of the projection away from the piston ring, and / or a guide angle is provided at one side of the groove facing the annular groove.

[0016] Optionally, a line from the center of the thrust block to the center of the piston ring is a first line, a line from the center of the opening to the center of the piston ring is a second line, and the first set angle is an angle between the first line and the second line.

[0017] Optionally, the line from the center of the installation mark to the center of the piston is the third line, the line from the projection of the thrust groove center on the top surface of the piston and the center of the piston is the fourth line, and the second set angle is the angle between the third line and the fourth line.

[0018] Optionally, a plurality of the installation marks are provided on the top surface of the piston, and the plurality of the installation marks are evenly arranged in a circular array along the center of the piston.

[0019] Optionally, three installation marks are provided, and the angle between adjacent installation marks is 120°.

[0020] An embodiment of the utility model further provides an engine, comprising the piston ring and piston assembly structure as described above.

[0021] One or more technical solutions provided in the embodiments of the present invention have at least the following technical effects or advantages:

[0022] 1. In this assembly structure, the thrust block structure allows the piston ring to be assembled only toward one side, and the foolproof structure prevents the piston ring from being installed upside down. In addition, the structure of the thrust groove and the thrust block limits the range of rotation of the piston ring, and prevents the piston ring from "matching". The structure of the thrust groove and the thrust block directly limits the assembly position and rotation range of the piston ring, and there is no need to adjust the piston ring opening angle again, which improves assembly efficiency.

[0023] 2. In this assembly structure, the thrust block is arranged at a position with a certain angle to the opening, that is, far away from the opening. The gas pressure is small relative to the opening, the deformation and distortion of the piston ring are small, and the force is small, which reduces the damage to the piston, piston ring, and cylinder liner and improves reliability.

[0024] 3. In this assembly structure, an installation mark is provided on the top surface of the piston. The angle between the installation mark and the thrust groove on the piston is consistent with the angle between the opening of the piston ring and the thrust block. When installing the piston ring, ensure that the opening of the piston ring is aligned with the installation mark. At this time, the thrust block and the thrust groove are also aligned, which is convenient for observation, improves work efficiency, ensures a one-time assembly success rate, and avoids the thrust block scratching the piston.

[0025] Additional advantages of the present invention will be given in the following description, and some will become apparent from the following description or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0027] Figure 1 It is a schematic diagram of the assembly of the piston and the piston ring provided in the embodiment of the utility model;

[0028] Figure 2 yes Figure 1 Enlarged view of part A in the middle;

[0029] Figure 3 This is a bottom view of a piston ring provided by an embodiment of the utility model;

[0030] Figure 4 This is a front view of a piston ring provided by an embodiment of the utility model;

[0031] Figure 5 It is a front view of a piston provided by an embodiment of the utility model;

[0032] Figure 6 yes Figure 5 Enlarged view of middle part B;

[0033] Figure 7It is a schematic diagram of the top surface of the piston provided in an embodiment of the utility model;

[0034] In the figure: 1, piston; 11, annular groove; 12, thrust groove; 13, installation mark; 2, piston ring; 21, opening; 22, thrust block;

[0035] In order to show the positions of various parts, the distances or sizes between them are exaggerated and the schematic diagram is for reference only. DETAILED DESCRIPTION

[0036] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0037] Explanation of relevant terms

[0038] Piston: It is a reciprocating part in the engine cylinder. The piston, cylinder head and cylinder wall together form the combustion chamber. Its main function is to withstand the combustion pressure in the cylinder and transmit this force to the crankshaft through the piston pin and connecting rod.

[0039] Piston ring: It is a metal ring embedded in the annular groove of the piston ring. There are two types of piston rings: gas ring and oil ring. The main function of the gas ring is sealing and heat conduction; the main function of the oil ring is oil distribution and scraping.

[0040] Piston ring "alignment": Piston ring openings are rotated in the same direction, which is called "alignment". Piston ring alignment can cause problems such as gas leakage and oil burning.

[0041] As introduced in the background technology, in the prior art, the assembly of piston rings mainly relies on the "TOP" mark on the piston ring to distinguish the front and back sides, and the adjustment of the opening angle is usually based on the process requirements, and the three piston ring openings are staggered by 120 degrees. However, this method has obvious defects: as the piston ring wears, the mark may become blurred, increasing the risk of reverse installation; at the same time, the process of adjusting the opening angle is complicated and time-consuming, affecting the assembly efficiency. In addition, the piston ring may rotate during the long-term operation of the engine, resulting in a "mouth-to-mouth" phenomenon, which will not only cause problems such as gas leakage and oil burning, but may also cause damage to the piston, piston ring and cylinder liner, affecting the reliability of the engine. In order to solve the above technical problems, the utility model proposes a piston ring and piston assembly structure.

[0042] like Figure 1 , Figure 2 As shown, the piston ring 2 is installed on the piston 1. Figure 3 , Figure 4 As shown, a thrust block 22 is provided on the axial side of the piston ring 2, and a first set angle is formed between the thrust block 22 and the opening 21. Figure 5 , Figure 6 As shown, a thrust groove 12 is provided on the axial side of the annular groove 11, and the thrust block 22 of the piston ring 2 is clamped in the thrust groove 12 of the annular groove 11. Figure 7 As shown, the top surface of the piston 1 is provided with an installation mark 13 corresponding to the projection of the thrust groove 12, the thrust groove 12 has a second setting angle between the projection of the top surface and the installation mark 13, and the first setting angle is equal to the second setting angle.

[0043] Thrust grooves 12 and thrust blocks 22 are processed on the piston 1 and piston ring 2 respectively. When assembling the piston 1 and piston ring 2, since the position of each thrust groove 12 is fixed (the staggered angle of each thrust groove 12 is determined according to the design requirements) and the direction of each thrust block 22 is fixed, the assembly direction and position of the piston ring 2 are limited, and the problems of reverse installation of the piston ring 2 and adjustment of the direction of the opening 21 of the piston ring 2 are solved. Figure 1 As shown, after the piston 1 and the piston ring 2 are assembled, the thrust block 22 can only be assembled at the position limited by the thrust groove 12 and rotate within the range limited by the thrust groove 12, thereby solving the "matching" problem of the piston ring 2.

[0044] The design of the thrust block 22 and the thrust groove 12 ensures the correct direction and position of the piston ring 2 during assembly, prevents the piston ring 2 from rotating or reversely installed, and improves the assembly accuracy and engine reliability. This structural design simplifies the assembly process and improves assembly efficiency. At the same time, due to the cooperation of the thrust block 22 and the thrust groove 12, the possibility of the piston ring 2 matching is reduced, and the running stability of the engine is improved.

[0045] If the thrust block 22 is arranged at the opening 21, during the operation of the engine, the gas pressure at the opening 21 of the piston ring 2 is higher than that at other positions. The piston ring 2 is greatly deformed and twisted here, and the force is higher than that at other positions, which makes it easier to damage the piston 1, the piston ring 2, and the cylinder liner, and the reliability risk is high.

[0046] In this embodiment, the thrust block 22 is arranged at a position with a certain angle to the opening 21, that is, far away from the opening 21. The gas pressure is smaller than that at the opening 21, the deformation and twisting of the piston ring 2 are smaller, and the force is smaller, which reduces the damage to the piston 1, the piston ring 2, and the cylinder liner and improves the reliability.

[0047] In addition, when installing the piston ring 2, the visual range is generally one end face of the piston 1, so the positions of the thrust block 22 and the thrust groove 12 are not easy to observe, it is difficult to ensure a successful assembly at one time, the installation efficiency is low, and the thrust block 22 is easy to scratch the piston 1.

[0048] Based on this, in this embodiment, an installation mark 13 is provided on the top surface of the piston 1. The angle between the installation mark 13 and the thrust groove 12 on the piston 1 is consistent with the angle between the opening 21 of the piston ring 2 and the thrust block 22. When installing the piston ring 2, it is sufficient to ensure that the opening 21 of the piston ring 2 is aligned with the installation mark 13. At this time, the thrust block 22 is also aligned with the thrust groove 12, which is convenient for observation, improves work efficiency, ensures a one-time assembly success rate, and avoids the thrust block 22 from scratching the piston 1.

[0049] like Figure 4 As shown, the thrust block 22 is a convex block protruding axially away from the piston ring 2 body on the axial side (i.e., the lower side) of the piston ring 2, and the thickness of the piston ring 2 at the position of the convex block is greater than the thickness of the piston ring 2 at the position without the convex block. The setting of the convex block makes the piston ring 2 have a certain thickness variation in the axial direction, which increases the strength of the thrust block 22 and the stability of the clamping. During assembly, the convex block protrudes axially, which is convenient for alignment and clamping with the concave part of the thrust groove 12.

[0050] During the manufacturing process, CNC machining technology can be used to accurately machine the protrusion on the axial side of the piston ring 2, and ensure that its position and size meet the design requirements. The first set angle between the protrusion and the opening 21 can be adjusted according to specific design requirements, for example, it can be 120 degrees, to ensure that the opening 21 of each piston ring 2 is staggered and does not align.

[0051] like Figure 6 As shown, the thrust groove 12 is a groove that is concave inwardly along the axial side surface (i.e., the lower side surface) of the annular groove 11 and away from the thrust groove 12 along the axial direction. The distance from the groove bottom to the opposite side of the annular groove 11 is greater than the axial groove width of the annular groove 11.

[0052] The concave design of the groove enables the thrust block 22 to be inserted therein, thereby forming a stable connection. During the assembly process, the cooperation between the thrust block 22 and the groove ensures the correct assembly direction and position of the piston ring 2.

[0053] During the processing of the piston 1, a CNC milling machine can be used to accurately process a groove on the axial side of the annular groove 11 to ensure that the position and size of the groove meet the design requirements. In this way, the thrust block 22 and the thrust groove 12 can be accurately matched to achieve foolproof assembly.

[0054] In this embodiment, Figure 4 As shown, the cross section of the bump is rectangular, as Figure 6As shown, the cross section of the groove is also rectangular, and the width of the protrusion along the circumferential direction is slightly smaller than the width of the groove along the circumferential direction. The width of the protrusion is smaller than the width of the groove, which provides a certain gap for assembly and facilitates assembly and disassembly. During the assembly process, the protrusion can slide smoothly into the groove, which can achieve snap-on connection while having a certain installation margin, thereby improving the flexibility and efficiency of assembly. Of course, it is understandable that the shape of the protrusion and the groove is not limited to a rectangle, but can also be a triangle, a semicircle, or other shapes, as long as the piston ring can be stopped from rotating.

[0055] In another embodiment, a guide angle is provided at one end of the projection away from the piston ring 2 (ie, the lower end), and / or a guide angle is provided at one side of the groove facing the annular groove 11 (ie, the upper side) (not shown in the figure).

[0056] The design of the guide angle can make the thrust block 22 more smoothly inserted into the groove, reduce the jamming phenomenon during the installation process, and reduce the difficulty of assembly. The guide angle can be designed as a 45-degree inclined plane, so that the thrust block 22 can naturally slide into the groove when it contacts the groove. Through this design, the convenience and success rate of assembly are improved, and the production efficiency is further improved.

[0057] The line from the center of the thrust block 22 to the center of the piston ring 2 is the first line, the line from the center of the opening 21 to the center of the piston ring 2 is the second line, and the first setting angle is the angle between the first line and the second line. The line from the center of the installation mark 13 to the center of the piston 1 is the third line, the line from the projection of the center of the thrust groove 12 on the top surface of the piston 1 and the center of the piston 1 is the fourth line, and the second setting angle is the angle between the third line and the fourth line.

[0058] By defining each connection line, the relative position of the thrust block 22 and the opening 21, as well as the relative position of the thrust groove 12 and the installation mark 13 can be accurately determined. By defining the two set angles, the piston ring 2 can be conveniently and quickly installed in the annular groove 11 during the assembly process, thereby improving assembly efficiency and accuracy.

[0059] The top surface of the piston 1 is provided with a plurality of installation marks 13, and the plurality of installation marks 13 are evenly arranged in a circular array along the center of the piston 1. The design of the plurality of installation marks 13 provides respective reference points for the assembly of the plurality of piston rings 2, and facilitates the uniform assembly of the piston rings 2. The installation marks 13 are arranged in a circular array, ensuring the uniform distribution of the counterparts of the piston rings 2 on the piston 1. Of course, it is understandable that the plurality of installation marks can also be arranged in a non-uniform manner, which does not affect the realization of their respective functions.

[0060] like Figure 7As shown, in this embodiment, three installation marks 13 are provided, and the angle between adjacent installation marks 13 is 120 degrees. The 120-degree angle design helps to achieve uniform staggering of the openings 21 of the piston ring 2, reduce the risk of gas leakage and oil burning, and improve the performance and reliability of the engine.

[0061] Based on the above assembly structure, an embodiment of the utility model further provides an engine, in which the assembly structure described in the above embodiment is arranged. Since the above assembly structure has the above technical effect, the technical effect of the engine adopting the assembly structure please refer to the above embodiment.

[0062] Although the above describes the specific implementation methods of the utility model in conjunction with the accompanying drawings, it is not intended to limit the protection scope of the utility model. Technical personnel in the relevant field should understand that on the basis of the technical solution of the utility model, various modifications or deformations that can be made by technical personnel in this field without creative work are still within the protection scope of the utility model.

Claims

1. A piston ring and piston assembly structure, wherein the piston has an annular groove, the piston ring is installed in the annular groove, and the circumference of the piston ring has an opening, characterized in that: A thrust block is provided on the axial side of the piston ring, and a first set angle is formed between the thrust block and the opening; A thrust groove is provided on the axial side of the annular groove, and the thrust block of the piston ring is clamped in the thrust groove of the annular groove. An installation mark is provided on the top surface of the piston, and the thrust groove has a second set angle between the projection of the top surface and the installation mark, wherein the first set angle is equal to the second set angle.

2. The piston ring and piston assembly structure according to claim 1, characterized in that: The thrust block is a convex block protruding axially away from the piston ring body on the axial side of the piston ring, and the thickness of the piston ring at the convex block position is greater than the thickness of the piston ring at the position where the convex block is not set.

3. The piston ring and piston assembly structure according to claim 2, characterized in that: The thrust groove is a groove which is concave inwardly on the axial side surface of the annular groove and away from the thrust groove in the axial direction, and the distance from the groove bottom to the opposite side of the annular groove is greater than the axial groove width of the annular groove.

4. The piston ring and piston assembly structure according to claim 3, characterized in that: The cross section of the protrusion is rectangular, the cross section of the groove is also rectangular, and the width of the protrusion along the circumferential direction is smaller than the width of the groove along the circumferential direction.

5. The piston ring and piston assembly structure according to claim 4, characterized in that: A guide angle is provided at one end of the projection away from the piston ring, and / or a guide angle is provided at one side of the groove facing the annular groove.

6. The piston ring and piston assembly structure according to claim 1, characterized in that: The line from the center of the thrust block to the center of the piston ring is the first line, the line from the center of the opening to the center of the piston ring is the second line, and the first setting angle is the angle between the first line and the second line.

7. The piston ring and piston assembly structure according to claim 1, characterized in that: The line from the center of the installation mark to the center of the piston is the third line, the line from the projection of the thrust groove center on the piston top surface and the center of the piston is the fourth line, and the second setting angle is the angle between the third line and the fourth line.

8. The piston ring and piston assembly structure according to claim 1, characterized in that: The top surface of the piston is provided with a plurality of the installation marks, and the plurality of the installation marks are evenly arranged in a circular array along the center of the piston.

9. The piston ring and piston assembly structure according to claim 8, characterized in that: Three installation marks are provided, and the angle between adjacent installation marks is 120°.

10. An engine, characterized in that: It comprises the piston ring and piston assembly structure as claimed in any one of Claims 9.

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