Oil ring

Abstract

The invention relates to an oil ring, and relates to the technical field of engines. The oil ring comprises a bushing ring, an upper scraper ring and a lower scraper ring. Wherein the upper scraper ring is arranged on the upper side of the bushing ring, and the upper scraper ring comprises an upper side face located on the upper portion and a first inner side face located on the inner side. And the lower scraper ring is arranged on the lower side of the bushing ring. The lower scraper ring comprises a lower side face located on the lower portion and a second inner side face located on the inner side. The inner side of the upper side face of the upper scraper ring is transited to the first inner side face through a first arc-shaped face. And / or the lower side surface of the lower scraper ring is transited to the second inner side surface through a second arc-shaped surface. According to the design, the abrasion of the upper scraper ring to the upper side wall can be reduced while the engine oil consumption is not influenced, and the lubrication between the upper scraper ring and the upper side wall is improved. And / or abrasion of the lower scraper ring to the lower side wall is reduced, and lubrication between the lower scraper ring and the lower side wall is improved.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to an oil ring. Background Art

[0002] In the field of engine technology, increasing explosion pressure and power is one effective way to improve engine thermal efficiency. However, this technical approach also presents numerous challenges in engine development. In particular, in the development of engines fueled by gasoline, natural gas, hydrogen, and methanol, knock is a major obstacle to achieving high performance.

[0003] Engine knock is caused by a variety of factors. From the perspective of the piston ring, controlling oil consumption plays a significant role in knock. Proper oil consumption control can effectively reduce or suppress the occurrence of knock. Within the piston ring assembly, the oil ring is a core component in controlling oil consumption, and its oil scraping ability directly determines oil consumption.

[0004] The three-piece oil ring, with its excellent oil consumption control capabilities, has been widely used in various types of engines, including gasoline, natural gas, hydrogen, and methanol. The three-piece oil ring consists of three key components: an upper scraper, a lower scraper, and a support spring. These three components work together to achieve efficient oil scraping and control, helping the engine cope with knock challenges and improving overall performance.

[0005] During the operation of the upper scraper and the lower scraper, there is point contact between the upper scraper and the upper side of the ring groove, and between the lower scraper and the lower side of the ring groove. Since the scraper has contact pressure on the side of the ring groove, after long-term operation, there will be wear at the point contact, which will lead to poor sealing performance. Summary of the Invention

[0006] Based on this, it is necessary to provide an oil ring to solve the problem of wear of the side wall of the ring groove by the upper scraper and the lower scraper of the oil ring in the prior art.

[0007] In one aspect, the present application provides an oil ring, comprising:

[0008] lining ring;

[0009] an upper scraper ring, which is arranged on the upper side of the liner ring, and the upper scraper ring includes an upper side surface located at the top and a first inner side surface located at the inner side;

[0010] A lower scraper ring is provided on the lower side of the liner ring; the lower scraper ring comprises a lower side surface located below and a second inner side surface located inside;

[0011] Wherein, the inner side of the upper side surface of the upper scraper ring transitions to the first inner side surface through a first arcuate surface; and / or

[0012] The lower side surface of the lower scraper ring transitions to the second inner side surface through a second arcuate surface.

[0013] Optionally, the radial dimension of the first arcuate surface is less than or equal to half of the radial dimension of the upper side surface.

[0014] Optionally, the first curved surface gradually decreases in height from the outer side to the inner side.

[0015] Optionally, a height difference between an inner side and an outer side of the first curved surface is less than or equal to 500 μm.

[0016] Optionally, the first arc surface is cut along a plane perpendicular to the upper side surface and passing through the center to form a first arc line, and the radius of the circle where the first arc line lies remains unchanged.

[0017] Optionally, the first arc surface is cut along a plane perpendicular to the upper side surface and passing through the center to form a first arc line, and the radius of the first arc line gradually decreases from the inside to the outside.

[0018] Optionally, the shape and size of the lower scraper ring are symmetrical to those of the upper scraper ring relative to the backing ring. Optionally, a first coating is provided on the upper side surface close to the first inner side surface; and / or

[0019] A second coating is provided on the lower side surface close to the second inner side surface.

[0020] Optionally, the radial dimension of the first coating is less than or equal to half of the radial dimension of the upper side surface; the radial dimension of the first coating is greater than or equal to the radial dimension of the first arcuate surface.

[0021] Optionally, the thickness of the first coating layer is 5-200 μm.

[0022] Optionally, the radial dimension of the second coating layer is less than or equal to half of the radial dimension of the lower side surface; the radial dimension of the second coating layer is greater than or equal to the radial dimension of the second arcuate surface.

[0023] Optionally, the second coating layer has a thickness of 5-200 μm.

[0024] The present invention provides a first curved surface on the inner side of the upper side surface of the upper scraper ring, which allows the contact between the inner side of the upper scraper ring and the upper sidewall of the annular groove to shift from point contact to surface contact. Due to the larger contact area, wear of the inner side of the upper scraper ring on the upper sidewall of the annular groove by the upper side of the upper scraper ring can be reduced. Since the upper side surface of the upper scraper ring and the upper sidewall of the annular groove still maintain contact (only point contact shifts to surface contact), the sealing performance of the entire upper scraper ring is not compromised, and therefore, oil consumption is not affected.

[0025] Since the inner side of the upper side surface of the upper scraper ring is designed as a first curved surface, compared to when it is not designed as a first curved surface, the contact between the upper side surface and the upper side wall of the ring groove not only changes from point contact to surface contact, but also makes the contact point move from the inside to the outside, so that the engine oil can enter between the upper side surface and the upper side wall of the upper scraper ring, which can well lubricate the upper scraper ring and the upper side wall of the ring groove, thereby reducing the wear between the upper scraper ring and the upper side wall of the ring groove.

[0026] The present invention provides a second curved surface on the inner side of the lower side of the lower scraper ring, which can change the contact between the inner side of the lower scraper ring and the lower sidewall of the annular groove from point contact to surface contact. The larger the surface contact area, the less wear the inner side of the lower scraper ring causes on the lower sidewall of the annular groove. Similarly, the lower side of the lower scraper ring and the lower sidewall of the annular groove still maintain contact, but the contact has changed from point contact to surface contact. Therefore, the sealing performance of the entire lower scraper ring is not damaged, and therefore, oil consumption is not affected.

[0027] Since the inner side of the lower side surface of the lower scraper ring is designed as a second curved surface, compared with the case where the second curved surface is not designed, the contact between the lower side surface and the lower side wall of the annular groove not only changes from point contact to surface contact, but also makes the contact point move from the inside to the outside, so that the engine oil can enter between the lower side surface and the lower side wall of the lower scraper ring, which can well lubricate the lower scraper ring and the lower side wall of the annular groove, thereby reducing the wear between the lower scraper ring and the lower side wall of the annular groove. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a structural schematic diagram of an oil ring provided in an annular groove according to one embodiment of the present application.

[0029] Figure 2 This is a structural diagram of an oil ring arranged in a ring groove in the prior art.

[0030] Figure 3 The diagram is a structural diagram of the oil ring in the prior art, which is subjected to twisting force in the ring groove and rubs against the upper and lower side walls of the ring groove.

[0031] Figure 4 This is a schematic structural diagram of an oil ring provided in one embodiment of the present application, which rubs against the upper and lower side walls of the ring groove after being twisted by force in the ring groove.

[0032] Figure 5 Schematic diagram of the correspondence between the contact pressure between the upper scraper ring and the upper side wall of the oil ring in the prior art during operation and the crankshaft angle.

[0033] Figure 6 This is a schematic diagram showing the correspondence between the contact pressure between the upper scraper ring and the upper side wall of the oil ring during operation and the crankshaft angle provided in one embodiment of the present application.

[0034] Figure 7 This is a schematic diagram of the cross-sectional structure of the upper scraper ring provided in one embodiment of the present application.

[0035] Figure 8 A schematic diagram of the cross-sectional structure of the lower scraper ring provided in one embodiment of the present application.

[0036] Figure 9 A schematic cross-sectional structure diagram of an upper scraper ring provided in another embodiment of the present application.

[0037] Figure 10 A schematic cross-sectional structure diagram of a lower scraper ring provided in another embodiment of the present application.

[0038] Figure 11 This is a schematic structural diagram of an oil ring provided in a ring groove according to another embodiment of the present application.

[0039] Description of Reference Numerals

[0040] Oil ring 100; liner ring 110; upper scraper ring 120; upper side surface 121; first inner side surface 122; first curved surface 123; first coating layer 124; lower scraper ring 130; lower side surface 131; second inner side surface 132; second curved surface 133; second coating layer 134; ring groove 200; upper side wall 210; lower side wall 220. DETAILED DESCRIPTION

[0041] To make the technical solutions and beneficial effects of this application more clearly understood, the following detailed description is given by way of specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly illustrate the details of the local features. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0042] As a specific embodiment of the present invention, Figure 1 As shown, this embodiment provides an oil ring 100, which is a three-piece oil ring 100. The oil ring 100 may include a backing ring 110, an upper scraper ring 120, and a lower scraper ring 130. The backing ring 110 is a spring sheet. The upper scraper ring 120 is disposed on the upper side of the backing ring 110 and includes an upper side surface 121 located at the top and a first inner side surface 122 located on the inside. The lower scraper ring 130 is disposed on the lower side of the backing ring 110. The lower scraper ring 130 includes a lower side surface 131 located at the bottom and a second inner side surface 132 located on the inside. The inner side of the upper side surface 121 of the upper scraper ring 120 transitions to the first inner side surface 122 via a first curved surface 123. And / or the lower side surface 131 of the lower scraper ring 130 transitions to the second inner side surface 132 via a second curved surface 133.

[0043] Specifically, if Figure 2 and Figure 3 As shown, in the prior art, when the oil ring 100 is set in the annular groove 200, the upper side surface 121 of the upper scraper ring 120 contacts the upper side wall 210 of the annular groove 200. During the operation of the oil ring 100, since the upper scraper ring 120 is easily deformed when subjected to force, the upper side surface 121 of the upper scraper ring 120 near the inner side will contact the upper side surface 121 of the annular groove 200 (as shown in FIG. Figure 3 As shown in FIG. 1A , after a long period of operation, the upper side wall 210 of the ring groove 200 may be damaged due to friction, thereby deteriorating the sealing performance of the oil ring 100 .

[0044] like Figure 1 and Figure 4 As shown, in this embodiment, a first arcuate surface 123 is provided on the inner side of the upper side surface 121 of the upper scraper ring 120, so that the contact between the inner side of the upper side surface 121 of the upper scraper ring 120 and the upper side wall 210 of the annular groove 200 is changed from point contact to surface contact. Due to the large contact area, the wear of the inner side of the upper side surface 121 of the upper scraper ring 120 on the upper side wall 210 of the annular groove 200 can be reduced. Since the upper side surface 121 of the upper scraper ring 120 and the upper side wall 210 of the annular groove 200 are still in contact, only the point contact is changed to surface contact (as shown in FIG. Figure 4 B in the figure), the sealing performance of the entire upper scraper ring 120 is not damaged, and therefore the oil consumption is not affected.

[0045] like Figure 5 The figure shows the distribution of the contact pressure between the upper side surface 121 of the upper scraper ring 120 and the upper side wall 210 of the annular groove 200 when no arc surface design is performed in the prior art. Figure 5 It can be seen that when the crankshaft angle is between -90 degrees and -4.5 degrees, the contact pressure can reach a larger value, and the maximum value reaches 225 bar. Figure 6 The figure shows the distribution of the contact pressure between the upper side surface 121 of the upper scraper ring 120 and the upper side wall 210 of the annular groove 200 after the first arc surface 123 is designed on the inner side of the upper side surface 121 of the upper scraper ring 120. Figure 6 It can be seen that the contact pressure is relatively high between crankshaft angles of 4.5 and 180 degrees, reaching a maximum of 170 bar. This demonstrates that the design of the first curved surface 123 on the inner side of the upper side surface 121 of the upper scraper ring 120 increases the contact area and reduces the contact pressure, thereby minimizing wear on the upper sidewall 210 of the annular groove 200 caused by the upper scraper ring 120.

[0046] Of course, since the inner side of the upper side surface 121 of the upper scraper ring 120 is designed as the first arc surface 123, compared with the case where the first arc surface 123 is not designed, the contact between the upper side surface 121 and the upper side wall 210 of the annular groove 200 is not only changed from point contact to surface contact, but also the contact point moves from the inside to the outside (such as Figure 3 and Figure 4 As shown), the engine oil can enter between the upper side surface 121 of the upper scraper ring 120 and the upper side wall 210, which can well lubricate the upper scraper ring 120 and the upper side wall 210 of the ring groove 200, thereby reducing the wear between the upper scraper ring 120 and the upper side wall 210 of the ring groove 200.

[0047] Likewise, if Figure 2 and Figure 3 As shown, when the oil ring 100 is set in the annular groove 200, the lower scraper ring 130 is also in contact with the lower side surface 131 of the annular groove 200. The lower scraper ring 130 is deformed by force during operation, causing the inner part of the lower side surface 131 of the lower scraper ring 130 to be in point contact with the lower side wall 220 of the annular groove 200. After long-term operation, the lower side wall 220 of the annular groove 200 will be damaged due to friction, thereby deteriorating the sealing performance of the oil ring 100.

[0048] Specifically, if Figure 4 As shown, in this embodiment, a second curved surface 133 is provided on the inner side of the lower side surface 131 of the lower scraper ring 130. This allows the contact between the inner side of the lower side surface 131 of the lower scraper ring 130 and the lower sidewall 220 of the annular groove 200 to be changed from point contact to surface contact. The larger area of surface contact can reduce the wear of the inner side of the lower side surface 131 of the lower scraper ring 130 on the lower sidewall 220 of the annular groove 200. Similarly, the contact between the lower side surface 131 of the lower scraper ring 130 and the lower sidewall 220 of the annular groove 200 remains, but the contact has only been changed from point contact to surface contact. Therefore, the sealing performance of the entire lower scraper ring 130 is not damaged, and therefore, the oil consumption is not affected.

[0049] Of course, since the inner side of the lower side surface 131 of the lower scraper ring 130 is designed as the second arc surface 133, compared with the case where the second arc surface 133 is not designed, the contact between the lower side surface 131 and the lower side wall 220 of the annular groove 200 is not only changed from point contact to surface contact, but also the contact point moves from the inside to the outside (such as Figure 3 The contact position of C in the middle is transformed into Figure 4 The position D in the middle) allows the engine oil to enter between the lower side surface 131 of the lower scraper ring 130 and the lower side wall 220, which can well lubricate the lower scraper ring 130 and the lower side wall 220 of the annular groove 200, thereby reducing the wear between the lower scraper ring 130 and the lower side wall 220 of the annular groove 200.

[0050] Specifically, in this embodiment, the first curved surface 123 may be provided only on the inner side of the upper side surface 121 of the upper scraper ring 120, or the second curved surface 133 may be provided only on the inner side of the lower side surface 131 of the lower scraper ring 130. Preferably, the first curved surface 123 is provided on the inner side of the upper side surface 121 of the upper scraper ring 120, and the second curved surface 133 is provided on the inner side of the lower side surface 131 of the lower scraper ring 130. When the first curved surface 123 is provided on the inner side of the upper side surface 121 of the upper scraper ring 120, and the second curved surface 133 is provided on the inner side of the lower side surface 131 of the lower scraper ring 130, the shapes of the first curved surface 123 and the second curved surface 133 can be completely mirror images. Of course, the first curved surface 123 and the second curved surface 133 can also be designed to have different shapes and sizes according to actual needs.

[0051] As an embodiment of the present application, Figure 7 As shown, the radial dimension L1 of the first curved surface 123 of this embodiment is less than or equal to half of the radial dimension L of the upper side surface 121. Since the contact points between the upper side surface 121 of the upper scraper ring 120 and the upper sidewall 210 of the annular groove 200 in this embodiment are mainly concentrated on the inner portion, this embodiment only needs to provide the first curved surface 123 on the inner portion of the upper side surface 121 to increase the contact area and reduce the contact pressure.

[0052] Specifically, if Figure 7 As shown, the first arc surface 123 of this embodiment is from the outside to the inside ( Figure 7 In the figure, the right side is the outer side and the left side is the inner side) is gradually reduced in height, so that when the upper scraper ring 120 contacts the upper side wall 210 of the annular groove 200, it contacts the upper side wall 210 through the first arc surface 123, and it is surface contact, thereby increasing the contact area.

[0053] In this embodiment, the height difference H1 between the inner and outer sides of the first arc-shaped surface 123 is less than or equal to 500 μm, so that the inner side of the upper scraper ring 120 is not too thin, which will not significantly affect the sealing performance or strength of the entire upper scraper ring 120 .

[0054] As a specific embodiment of the present application, the first arc surface 123 of this embodiment is cut along a plane passing through the center of the vertical upper side surface 121 to form a first arc line, and the radius of the circle where the first arc line is located remains unchanged (not shown in the figure).

[0055] Specifically, the radius of the circle where the first arcs of this embodiment are located remains unchanged, so that the first arcs are all on the same arc.

[0056] As another example, Figure 7As shown, the first curved surface 123 of this embodiment is cut along a plane perpendicular to the center of the upper side surface 121 to form a first arc, and the radius of the first arc gradually decreases from the inner side to the outer side. The first arc of this embodiment is not on the same arc, but its radius gradually decreases, so that the curvature of the second arc gradually increases, and can form an arc transition with the first inner side surface 122 while ensuring surface contact.

[0057] As a specific embodiment of this application, Figure 8 As shown, the radial dimension L2 of the second curved surface 133 of this embodiment is less than or equal to half of the radial dimension L of the lower side surface 131. Since the contact points between the lower side surface 131 of the lower scraper ring 130 and the lower sidewall 220 of the annular groove 200 in this embodiment are mainly concentrated on the inner portion, this embodiment only needs to provide the second curved surface 133 on the inner portion of the lower side surface 131 to increase the contact area and reduce the contact pressure.

[0058] Specifically, the second arc surface 133 of this embodiment gradually increases in height from the outside to the inside ( Figure 8 In this way, when the lower scraper ring 130 contacts the lower side wall 220 of the annular groove 200, the second arcuate surface 133 contacts the lower side wall 220, and the contact is surface contact, thereby increasing the contact area.

[0059] Specifically, the height difference H2 between the inner and outer sides of the second curved surface 133 of this embodiment is less than or equal to 500 μm, so that the inner side of the lower scraper ring 130 is not too thin, which will not significantly affect the sealing performance or strength of the entire lower scraper ring 130.

[0060] As one embodiment of the present application, the second curved surface 133 of this embodiment is cut along a plane perpendicular to the lower side surface 131 and passing through the center to form a second arc line, and the radius of the circle on which the second arc line is located remains unchanged (not shown in the figure). In this way, the radius of the circle on which the second arc line is located remains unchanged, so that the second arc lines are all on the same arc.

[0061] As another specific embodiment, Figure 8 As shown, the second curved surface 133 of this embodiment is cut along a plane perpendicular to the center of the lower side surface 131 to form a second arc. The radius of the circle in which the second arc is located gradually decreases from the outer side to the inner side. The second arc of this embodiment is not on the same arc, but its radius gradually decreases, resulting in a gradually increasing curvature of the second arc, which can form an arc-shaped transition with the second inner side surface 132 while ensuring surface contact.

[0062] It will be appreciated that the shape and dimensions of the lower scraper ring 130 of this embodiment are symmetrical with those of the upper scraper ring 120 relative to the backing ring 110. Symmetrical arrangement means that the upper scraper ring 120 and the lower scraper ring 130 are mirror images of each other in shape and structure. Alternatively, the upper scraper ring 120 and the lower scraper ring 130 can be combined based on the above-described dimensions to meet different internal combustion engine operating requirements (e.g., cylinder diameter, piston thickness, number of rings, etc.).

[0063] As a specific embodiment of this application, Figures 9-11 As shown, in this embodiment, a first coating 124 is provided on the upper side surface 121 near the first inner side surface 122 , and / or a second coating 134 is provided on the lower side surface 131 near the second inner side surface 132 .

[0064] Specifically, if Figure 9 As shown, a first coating 124 can be provided on the upper side surface 121 of the upper scraper ring 120 in this embodiment near the first inner side surface 122. The material of the first coating 124 can be a soft, self-lubricating coating such as sprayed carbon, polymer, or MoS2. The buffering and lubricating effect of the first coating 124 can reduce friction between the upper side surface 121 of the upper scraper ring 120 and the upper sidewall 210, thereby reducing wear on the upper side surface 121 against the upper sidewall 210.

[0065] Likewise, if Figure 10 As shown, in this embodiment, a second coating 134 can be provided on the lower side surface 131 of the lower scraper ring 130 near the second inner side surface 132. The material of the second coating 134 can also be a soft, self-lubricating coating such as sprayed carbon, polymer, or MoS2. The buffering and lubricating effect of the second coating 134 can reduce the friction between the lower side surface 131 of the lower scraper ring 130 and the lower sidewall 220, thereby reducing the wear of the lower side surface 131 on the lower sidewall 220.

[0066] Preferably, if Figure 11 As shown, a first coating 124 is provided on the upper side 121 of the upper wiper ring 120 , while a second coating 134 is provided on the lower side 131 of the lower wiper ring 130 .

[0067] Specifically, if Figure 9 As shown, the radial dimension S1 of the first coating 124 of this embodiment is less than or equal to half of the radial dimension L of the upper side surface 121. Since the contact points between the upper side surface 121 of the upper scraper ring 120 and the upper sidewall 210 are mainly concentrated on the inner side of the upper side surface 121, the radial dimension S1 of the first coating 124 of this embodiment is less than or equal to half of the radial dimension L of the upper side surface 121, thereby ensuring reduced wear while also reducing the use of coating material.

[0068] More specifically, the radial dimension S1 of the first coating layer 124 of this embodiment is greater than or equal to the radial dimension L1 of the first curved surface 123. This design allows the first coating layer 124 to cover the first curved surface 123. With the dual support of the first curved surface 123 and the first coating layer 124, wear of the upper side surface 121 of the upper scraper ring 120 on the upper sidewall 210 of the annular groove 200 is further reduced.

[0069] Specifically, the thickness of the first coating layer 124 of this embodiment can be 5-200 μm. For example, the thickness of the first coating layer 124 can be 5 μm, 50 μm, 80 μm, 100 μm, 150 μm, 180 μm, or 200 μm. The specific size can be designed according to actual conditions.

[0070] As a specific embodiment of this application, Figure 10 As shown, the radial dimension S2 of the second coating 134 of this embodiment is less than or equal to half of the radial dimension L of the lower side surface 131. Since the contact points between the lower side surface 131 of the lower scraper ring 130 and the lower sidewall 220 are mainly concentrated on the inner side of the lower side surface 131, the radial dimension S2 of the second coating 134 of this embodiment is less than or equal to half of the radial dimension L of the lower side surface 131, thereby ensuring reduced wear while also reducing the use of coating material.

[0071] Specifically, the radial dimension S2 of the second coating layer 134 is greater than or equal to the radial dimension L2 of the second curved surface 133. This design allows the second coating layer 134 to cover the second curved surface 133. With the dual support of the second curved surface 133 and the second coating layer 134, the wear of the lower side surface 131 of the lower scraper ring 130 on the lower sidewall 220 of the annular groove 200 is further reduced.

[0072] Specifically, the thickness of the second coating layer 134 of this embodiment can be 5-200 μm. For example, the thickness of the second coating layer 134 can be 5 μm, 50 μm, 80 μm, 100 μm, 150 μm, 180 μm or 200 μm, etc. The specific size can be designed according to actual conditions.

[0073] In the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of simplified description of the present application, and do not indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, that is, they should not be understood as limitations on the present application.

[0074] In this application, the terms "first" and "second" are used solely for descriptive purposes and should not be construed as indicating the relative importance of the features indicated or the quantity of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly include at least one of such features. In this application, "plurality" means at least two, such as two or three, and "several" means at least one, such as one, two, or three, unless otherwise specifically defined.

[0075] In this application, unless otherwise expressly defined, the terms "installed," "connected," "connect," "fixed," and "disposed" should be interpreted broadly. For example, "connection" can mean fixed, removable, or integrated; it can mean mechanical or electrical; it can mean direct or indirect connection through an intermediary; it can also mean internal communication between two components or an interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0076] In the present application, unless otherwise explicitly defined, when a first feature is “on,” “above,” “above,” “above,” “below,” “below,” or “below” a second feature, the first feature and the second feature may be in direct contact, or the first feature and the second feature may be in indirect contact via an intermediate medium. Moreover, when a first feature is “on,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0077] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations of the claims. Various modifications and variations may be made to the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form additional embodiments of the present application that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of the present application and do not limit the scope of protection of the patent application.

Claims

1. An oil ring, characterized in that: include: lining ring; an upper scraper ring, which is arranged on the upper side of the liner ring, and the upper scraper ring includes an upper side surface located at the top and a first inner side surface located at the inner side; A lower scraper ring is provided on the lower side of the liner ring; the lower scraper ring comprises a lower side surface located below and a second inner side surface located inside; Wherein, the inner side of the upper side surface of the upper scraper ring transitions to the first inner side surface through a first arcuate surface; and / or The lower side surface of the lower scraper ring transitions to the second inner side surface through a second arcuate surface.

2. The oil ring according to claim 1, characterized in that: The radial dimension of the first arcuate surface is less than or equal to half of the radial dimension of the upper side surface.

3. The oil ring according to claim 1, characterized in that The height of the first arc-shaped surface gradually decreases from the outer side to the inner side.

4. The oil ring according to claim 3, characterized in that A height difference between an inner side and an outer side of the first curved surface is less than or equal to 500 μm.

5. The oil ring according to claim 3, characterized in that: The first arc surface is cut along a plane perpendicular to the upper side surface and passing through the center to form a first arc line, and the radius of the circle where the first arc line is located remains unchanged.

6. The oil ring according to claim 3, characterized in that The first arc surface is cut along a plane perpendicular to the upper side surface and passing through the center to form a first arc line, and the radius of the first arc line gradually decreases from the inside to the outside.

7. The oil ring according to any one of claims 1 to 6, characterized in that: The shape and size of the lower scraper ring are symmetrical to those of the upper scraper ring relative to the backing ring.

8. The oil ring according to any one of claims 1 to 6, characterized in that: A first coating is provided on the upper side surface close to the first inner side surface; and / or A second coating is provided on the lower side surface close to the second inner side surface.

9. The oil ring according to claim 8, characterized in that The radial dimension of the first coating layer is less than or equal to half of the radial dimension of the upper side surface; the radial dimension of the first coating layer is greater than or equal to the radial dimension of the first arcuate surface.

10. The oil ring according to claim 9, characterized in that The thickness of the first coating layer is 5-200 μm.

11. The oil ring according to claim 10, characterized in that: The radial dimension of the second coating layer is less than or equal to half of the radial dimension of the lower side surface; the radial dimension of the second coating layer is greater than or equal to the radial dimension of the second arcuate surface.

12. The oil ring according to claim 11, characterized in that The thickness of the second coating layer is 5-200 μm.

Images