Combined piston ring with inner support

Abstract

The utility model provides a combined piston ring with an inner support, which comprises a first piston ring, the first piston ring comprises an outer ring and an inner support ring coaxially sleeved in the outer ring, and the inner circumferential surface of the outer ring is tightly attached to the outer circumferential surface of the inner support ring; the inner supporting ring is provided with an inner supporting ring opening, a convex key is formed on the inner circumferential surface of the outer ring, the convex key is inserted into the inner supporting ring opening to realize positioning, and an axial through hole is formed between the convex key and the inner supporting ring; a circumferential annular lubricating oil recovery groove is formed in the lower surface of the first piston ring, and the lubricating oil recovery groove is located at the connecting position of the inner supporting ring and the outer ring; and the axial through hole is communicated with the lubricating oil recovery groove. The combined piston ring not only can avoid radial leakage of gas when the piston moves upwards, but also can recycle lubricating oil in a combustion chamber above the piston, and loss and combustion of the lubricating oil are avoided. Moreover, the processing is simple, and the assembly is convenient.

Description

Technical Field

[0001] The utility model relates to the field of piston rings, in particular to a combined piston ring with an inner support. Background Art

[0002] One of the functions of the piston ring is sealing, that is, to prevent the combustible and high-temperature mixture in the cylinder from leaking into the crankcase, and to prevent the lubricating oil in the crankcase from flowing into the combustion chamber.

[0003] A piston typically has two or more ring grooves, each containing a piston ring. Each ring has an opening, creating a direct path between the ring opening and the cylinder wall. Although the ring openings are staggered during installation, the ring openings can overlap during piston movement, resulting in poor sealing and prone to air and oil leaks. Furthermore, as the piston moves upward (i.e., toward the combustion chamber), lubricating oil scraped from the combustion chamber wall by the piston rings can easily flow upward into the combustion chamber, causing loss and combustion. Utility Model Content

[0004] The purpose of the utility model is to provide a combined piston ring with an inner support.

[0005] The technical solution for achieving the purpose of the utility model is: a combined piston ring with an inner support, comprising a first piston ring, wherein the first piston ring comprises an outer ring and an inner support ring coaxially sleeved inside the outer ring, wherein the inner circumference of the outer ring is tightly arranged with the outer circumference of the inner support ring;

[0006] The inner support ring has an inner support ring opening, and a convex key is formed on the inner circumference of the outer ring. The convex key is inserted into the inner support ring opening to achieve positioning, and an axial through hole is provided between the convex key and the inner support ring;

[0007] A circumferential lubricating oil recovery groove is provided on the lower surface of the first piston ring, and the lubricating oil recovery groove is located at the connection position between the inner support ring and the outer ring;

[0008] The axial through hole is communicated with the lubricating oil recovery groove.

[0009] Generally speaking, the upper end of the piston and piston ring is the end facing the cylinder combustion chamber; the lower end of the piston and piston ring is the end facing away from the cylinder combustion chamber.

[0010] The first piston ring of the combined piston ring of the present invention is a sleeve ring structure assembled from an outer ring and an inner support ring, which will not rotate circumferentially and has a better sealing effect. When the first piston ring is installed on the piston of the cylinder with the lubricating oil recovery groove facing away from the combustion chamber of the cylinder, it can not only realize the recovery of lubricating oil in the combustion chamber above the piston, but also avoid the loss and combustion of lubricating oil. In addition, the lubricating oil filled in the lubricating oil recovery groove is used in the radial direction to control the radial leakage of gas when the piston moves upward (that is, when the piston moves toward the combustion chamber). The lubricating oil recovery groove is located at the connection position between the inner support ring and the outer ring, which avoids the influence of piston ring end face wear on the lubricating oil recovery groove. In addition, the inner support ring and the outer ring are easy to assemble.

[0011] The lubricating oil recovery groove can be implemented by chamfering the outer circumference of the lower surface of the inner support ring, so that the outer circumference of the inner support ring and the inner circumference of the outer ring enclose the lubricating oil recovery groove. This implementation method allows the chamfered structure to be directly formed when the inner support ring is made of steel wire, which is more convenient to manufacture and does not require additional grooving.

[0012] The lubricating oil recovery groove may also be implemented as follows: a circumferential annular groove is provided on the inner circumference of the lower surface of the outer ring, so that the outer circumferential surface of the inner support ring and the inner circumference of the outer ring are enclosed to form the lubricating oil recovery groove.

[0013] Furthermore, the lower surface of the cam is higher than the lower surface of the outer ring, so that a groove is formed between the lower surface of the cam and the inner circumferential surface of the outer ring, and the groove is connected to the lubricating oil recovery groove along the circumference of the outer ring.

[0014] Furthermore, the inner support ring opening is a T-shaped opening that is narrow inside and wide outside, the convex key is columnar, and the end of the convex key extends inward to the narrow section of the inner support ring opening. The convex key is adapted to the narrow section of the inner support ring opening, and the convex key and the wide section of the inner support ring opening are enclosed to form the axial through hole.

[0015] The outer ring has an outer ring opening, and the axial through hole is connected to the outer ring opening via the lubricating oil recovery groove. Furthermore, the upper portion of one outer ring opening section of the outer ring extends outward along its circumference to form an upper boss, and the lower portion of the other outer ring opening section corresponding to the outer ring opening of the outer ring extends outward along its circumference to form a lower boss, and the upper boss and the lower boss are arranged in a vertically aligned manner. The outer ring opening adopts an overlapping structure consisting of an upper boss and a lower boss to prevent axial gas leakage. The outer ring opening and the inner support ring opening are staggered in the circumferential direction.

[0016] Further, the combined piston ring with an inner support further includes a second piston ring. The second piston ring is an integrated ring structure. The second piston ring is superimposed above the first piston ring. The outer diameter of the second piston ring is equal to the diameter of the outer ring, and the inner diameter of the second piston ring is smaller than the diameter of the inner support ring. When the second piston ring is superimposed above the first piston ring, it can axially contact both the outer ring and the inner support ring simultaneously, preventing the inner support ring from axially shifting. Preferably, the first piston ring and the second piston ring are jointly installed in the same ring groove of the piston. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 FIG. 6 is a bottom view structural schematic diagram of the first piston ring of Embodiment 1;

[0018] Figure 2 FIG. 7 is a sectional structural schematic diagram of the first piston ring of Embodiment 1 along line A-A in FIG. 6; Figure 1 in FIG. 6;

[0019] Figure 3 FIG. 8 is a three-dimensional structural schematic diagram of the combined piston ring with an inner support of Embodiment 1;

[0020] Figure 4 FIG. 9 is a schematic diagram of the assembled state of the combined piston ring with an inner support of Embodiment 1 when the piston moves upward, wherein the first piston ring is a sectional structural diagram along line B-B in FIG. 8; Figure 1 in FIG. 8;

[0021] Figure 5 FIG. 10 is a bottom view structural schematic diagram of the first piston ring of Embodiment 2;

[0022] Figure 6 FIG. 11 is a sectional structural schematic diagram of the first piston ring of Embodiment 2 along line C-C in FIG. 10; Figure 5 in FIG. 10. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The following describes in detail the preferred embodiments of the combined piston ring with an inner support of the present invention with reference to the accompanying drawings. Embodiment 1

[0024] With reference to FIG. 4, a combined piston ring with an inner support includes a first piston ring 10. The first piston ring 10 includes an outer ring 11 and an inner support ring 12 coaxially sleeved inside the outer ring 11, and the inner peripheral surface of the outer ring 11 is tightly attached to the outer peripheral surface of the inner support ring 12; Figures 1 to 4 FIG. 4

[0025] An inner support ring opening 120 is formed on the inner support ring 12. A convex key 110 is formed on the inner peripheral surface of the outer ring 11. The convex key 110 is inserted into the inner support ring opening 120 for positioning. An axial through hole 20 is provided between the convex key 110 and the inner support ring;

[0026] A circumferentially annular lubricating oil recovery groove 30 is formed on the lower surface of the first piston ring 10, and the lubricating oil recovery groove 30 is located at the connection position between the inner support ring 12 and the outer ring 11;

[0027] The axial through hole 20 communicates with the lubricating oil recovery groove 30;

[0028] Wherein, the outer periphery of the lower surface of the inner support ring 12 is chamfered, so that the outer periphery of the inner support ring 12 and the inner peripheral surface of the outer ring 11 enclose to form the lubricating oil recovery groove 30.

[0029] The outer ring 11 and the inner support ring 12 have the same thickness. Embodiment 2

[0030] The combined piston ring with an inner support in Embodiment 2 is different from that in Embodiment 1 in that: as Figure 5 、 Figure 6 shown, a circumferentially annular cut groove is provided on the inner periphery of the lower surface of the outer ring 11, so that the outer peripheral surface of the inner support ring 12 and the inner periphery of the outer ring 11 enclose to form the lubricating oil recovery groove 30.

[0031] As Figure 4 、 Figure 5 shown, when the first piston ring 10 is installed, the lubricating oil recovery groove 30 of the first piston ring 10 faces downward (i.e., away from the combustion chamber 100). When the piston moves upward (i.e., the piston moves in the direction close to the combustion chamber 100), the cylinder is in the compression or exhaust stroke, and the lower surface of the first piston ring 10 closely adheres to the lower edge of the ring groove 41 of the piston 40, so that the lower edge of the ring groove 41 closes the lower end opening of the lubricating oil recovery groove 30, forming a closed lubricating oil recovery flow channel. At this time, there is usually a certain gap between the upper surface of the first piston ring 10 and the upper edge of the ring groove 41. Under the action of the pressure difference, the lubricating oil on the cylinder wall 400 in the combustion chamber above the piston 40 is easily blown down by the high-pressure gas in the combustion chamber 100, and flows downward through the ring groove 41 where the first piston ring 10 is located and the axial through hole 20 in sequence, and then flows into the lubricating oil recovery groove 30. Moreover, the lubricating oil in the lubricating oil recovery groove 30 can play a role of "oil seal" to avoid radial leakage of gas on the lower surface of the first piston ring 10.

[0032] The combined piston ring of the present invention can realize the recovery of the lubricating oil in the combustion chamber 100 above the piston 40, avoid the loss and combustion of the lubricating oil; and can reduce the risk of gas leakage. In addition, the inner support ring 12 and the outer ring 11 are convenient to assemble.

[0033] Of course, the lubricating oil recovery groove 30 only needs to meet the condition of "a circumferentially annular lubricating oil recovery groove 30 is provided on the lower surface of the first piston ring 10, and the lubricating oil recovery groove 30 is located at the connection position between the inner support ring 12 and the outer ring 11", and the specific implementation manner thereof is not limited to the specific structures disclosed in Embodiment 1 and Embodiment 2.

[0034] Furthermore, the combined piston ring with inner support further includes a second piston ring 50. The second piston ring 50 is an integral ring structure. The second piston ring 50 has an opening 500. The second piston ring 50 is superimposed above the first piston ring 10. The outer diameter of the second piston ring 50 is equal to the diameter of the outer ring 11, and the inner diameter of the second piston ring 50 is smaller than the diameter of the inner support ring 12. The first piston ring 10 and the second piston ring 50 are preferably installed together in the same ring groove 41 of the piston 40.

[0035] Of course, the first piston ring 10 of the present invention can be used alone or in combination with the second piston ring 50.

[0036] Furthermore, in combination Figure 2 and Figure 3 , the lower surface of the convex key 110 is higher than the lower surface of the outer ring 11, so that a groove 60 is formed by enclosing between the lower surface of the convex key 110 and the inner circumferential surface of the outer ring 11. The groove 60 is communicated with the lubricating oil recovery groove 30 along the circumference of the outer ring 11. Of course, the combined piston ring with inner support of the present invention may not be provided with the groove 60.

[0037] Furthermore, as Figures 3 to 5 , the inner support ring opening 120 is a T-shaped opening that is narrow on the inside and wide on the outside. The convex key 110 is columnar. The end of the convex key 110 extends inwards to the narrow section of the inner support ring opening 120. The convex key 110 is adapted to the narrow section of the inner support ring opening 120. An axial through hole 20 is formed by enclosing between the convex key 110 and the wide section of the inner support ring opening 120. The inner support ring opening 120 of the present invention may be, but is not limited to, the T-shaped opening in the drawings.

[0038] As Figure 3 shown, the outer ring 11 has an outer ring opening 111. The axial through hole 20 is communicated with the outer ring opening 111 through the lubricating oil recovery groove 30. Furthermore, as Figure 3As shown, the upper part of one outer ring opening section of the outer ring 11 extends outward along its circumference to form an upper convex platform 112, and the lower part of the other outer ring opening section corresponding to the outer ring opening of the outer ring 11 extends outward along its circumference to form a lower convex platform 113. The upper convex platform 112 and the lower convex platform 113 are arranged in an upper and lower fitting manner. The outer ring opening 111 adopts an overlapping opening structure composed of the upper convex platform 112 and the lower convex platform 113, which can avoid axial gas leakage. As Figure 3 shown, the outer ring opening 111 and the inner support ring opening 120 are arranged offset in the circumferential direction.

[0039] The above are only the embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent process transformation made by using the content of the specification of the present invention, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present invention.

Claims

1. A combined piston ring with an inner support, comprising a first piston ring. The first piston ring includes an outer ring and an inner support ring coaxially sleeved inside the outer ring, and the inner peripheral surface of the outer ring is tightly attached to the outer peripheral surface of the inner support ring; The inner support ring has an inner support ring opening, and a convex key is formed on the inner peripheral surface of the outer ring. The convex key is inserted into the inner support ring opening for positioning; It is characterized in that: An axial through hole is provided between the convex key and the inner support ring; A circumferential annular lubricating oil recovery groove is formed on the lower surface of the first piston ring, and the lubricating oil recovery groove is located at the connection position between the inner support ring and the outer ring; The axial through hole is communicated with the lubricating oil recovery groove.

2. The combined piston ring with an inner support according to claim 1, characterized in that: The outer periphery of the lower surface of the inner support ring is chamfered, so that the outer periphery of the inner support ring and the inner peripheral surface of the outer ring enclose to form the lubricating oil recovery groove.

3. The combined piston ring with an inner support according to claim 1, wherein: A circumferential annular cut groove is provided on the inner periphery of the lower surface of the outer ring, so that the outer peripheral surface of the inner support ring and the inner periphery of the outer ring enclose to form the lubricating oil recovery groove.

4. The combined piston ring with an inner support according to claim 1, characterized in that: The lower surface of the convex key is higher than the lower surface of the outer ring, so that a groove is formed between the lower surface of the convex key and the inner peripheral surface of the outer ring, and the groove is communicated with the lubricating oil recovery groove along the circumference of the outer ring.

5. The combined piston ring with an internal support according to claim 1, characterized in that: The inner support ring opening is a T-shaped opening with a narrow inner part and a wide outer part. The convex key is columnar, and the end of the convex key extends inwards to the narrow section of the inner support ring opening. The convex key is adapted to the narrow section of the inner support ring opening, and an axial through hole is formed between the convex key and the wide section of the inner support ring opening.

6. The combined piston ring with an internal support according to claim 1, characterized in that: The outer ring has an outer ring opening, and the axial through hole is communicated with the outer ring opening through the lubricating oil recovery groove.

7. The combined piston ring with internal support according to claim 6, characterized in that: An upper convex platform extends outwards along its circumference at the upper part of the cross section of one outer ring opening of the outer ring, and a lower convex platform extends outwards along its circumference at the lower part of the cross section of the other outer ring opening corresponding to the outer ring opening of the outer ring. The upper convex platform and the lower convex platform are arranged in a vertically fitting manner.

8. The combined piston ring with an internal support according to claim 6, characterized in that: The outer ring opening and the inner support ring opening are arranged staggeredly in the circumferential direction.

9. The combined piston ring with an inner support according to claim 1, characterized in that: The combined piston ring with an inner support further includes a second piston ring. The second piston ring is an integrated ring structure. The second piston ring is stacked above the first piston ring. The outer diameter of the second piston ring is equal to the diameter of the outer ring, and the inner diameter of the second piston ring is smaller than the diameter of the inner support ring.

10. The combined piston ring with an inner support according to claim 9, characterized in that: The first piston ring and the second piston ring are jointly installed in the same ring groove of the piston.

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