WO2002025090A1

WO2002025090A1 - A combined gas ring and its piston ring-piston assembly

Info

Publication number: WO2002025090A1
Application number: PCT/CN2001/000542
Authority: WO
Inventors: Weimin Tang
Original assignee: Weimin Tang
Priority date: 2000-09-20
Filing date: 2001-04-03
Publication date: 2002-03-28
Also published as: AU2001263730A1

Abstract

The invention discloses a combined gas ring for reciprocating piston ring-piston assembly. The combined gas ring includes elastic groove-ring (1), cap-ring (2), zero to several upper steel disc-ring (3) and enclosure piece (7). Under the assembled state of the gas ring with piston and cylinder, the cut-out (11) of groove-ring (1) and the cut-out (15) of cap-ring (2) stagger around their periphery. The enclosure piece (7) is located at the cut-out (11) of groove-ring (1), so that the cut-out (11) is enclosed by the enclosure piece. The invention also discloses a piston and piston ring assembly with the combined gas ring. Because there isn't leakage passage in the gas ring, gas-tight and oil control ability is good, the shortage of heating piston and destroying oil film is eliminated. Using the invention of combined gas ring can improve the engine performance and attain the piston structure with one gas ring and one oil ring.

Description

Combined air ring and piston ring-piston assembly

Technical field

The invention relates to a piston ring, in particular to a combined air ring. The invention also relates to a piston ring-piston assembly using the combined air ring, which is suitable for various reciprocating piston engines, especially for reciprocating piston two- or four-stroke engines. Background technique

The traditional air ring is usually a one-piece air ring, and a straight-through air leakage channel exists at the cut of the air ring. Therefore, the existing air ring seals on the cylinder are based on the throttling principle. Two to three air rings are sequentially installed in the ring grooves on the piston in the axial direction, and the cuts of the air rings are staggered in the circumferential direction. In order to form the "逑宫式" gas-sealing structure. This structure has a series of disadvantages caused by inter-ring gas flow and inter-ring gas flow. It cannot eliminate the short-circuit gas leakage phenomenon when the upper and lower piston ring counterparts. The righting effect of the piston ring on the piston is also caused by the rotation of the upper and lower rings. And worse.

In addition, the existing piston ring-piston assemblies currently used in reciprocating piston engines all adopt an air-sealing structure in which a plurality of air rings are sequentially arranged in the axial direction on the piston. At least two air rings are required for this type of gas sealing. Therefore, the conventional piston ring-piston assembly cannot reduce the reciprocating inertial mass of the piston by reducing the number of air rings. On the other hand, due to the structural position relationship, the load difference of each constituent ring is large, and it is difficult to improve the overall performance of the engine by giving full play to the working performance of each constituent ring. Technical solutions

An object of the present invention is to provide a combined air ring, which can prevent straight-through gas leakage to achieve the technical effects of enhancing gas sealing and controlling oil consumption of the engine oil.

Another object of the present invention is to provide a piston ring-piston assembly applied to a reciprocating piston engine. On the basis of achieving a good sealing effect, the number of air rings can be reduced to reduce the reciprocating inertial mass of the piston.

According to a first aspect of the present invention, a combination of a reciprocating piston ring-piston assembly is provided. Type gas ring, the combined gas ring includes a groove ring, a cover ring, zero to several upper steel sheet rings, and a sealing sheet, wherein, in an assembled state with a piston and a cylinder liner, a cutout on the groove ring and The cut of the cover ring located above it is staggered in the circumferential direction, and the sealing sheet is installed at the cut on the groove ring so that the cut on the groove ring is blocked in the radial direction by the sealing sheet live.

According to a second aspect of the present invention, a piston ring-piston assembly for a reciprocating piston engine is provided, wherein the piston is provided with a combined air ring according to the first aspect of the present invention.

Since the combined gas ring of the present invention does not have a free leaking channel, it has good air tightness, good performance of controlling oil, and many disadvantageous factors such as heating the piston caused by blow-by gas between the rings and damaging the oil film are eliminated together. Therefore, by adopting the combined air ring of the present invention, the overall performance of the engine can be comprehensively improved and improved, and a two-ring piston structure with one air ring and one oil ring can be realized. Brief description of the drawings

The present invention is further described in detail below with reference to the accompanying drawings and embodiments.

FIG. 1 is a partial axial cross-sectional view showing a preferred embodiment of the combined air ring of the present invention; FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a partial enlarged view of part B in FIG. 2, showing the relative positional relationship between the cut of the groove ring, the protrusion of the sealing sheet and the groove of the cover ring;

FIG. 4 is a schematic diagram showing the crust shape of the sealing sheet;

5 is a plan view showing a structure of a cover ring groove of the present invention;

6 is a plan view showing another structure of the cover ring groove of the present invention;

7 is a half cross-sectional view of the first embodiment of the piston ring-piston assembly of the present invention;

8 is a half cross-sectional view of a second embodiment of the piston ring-piston assembly of the present invention;

9 is a half cross-sectional view of a third embodiment of the piston ring-piston assembly of the present invention;

Fig. 10 is a half cross-sectional view of a fourth embodiment of the piston ring-piston assembly of the present invention. Detailed description of the preferred embodiment

As shown in FIGS. 1, 2 and 3, the combined air ring 20 of the present invention includes a grooved ring 1 having elasticity and all openings 11, a cover ring 2 with all openings 15, zero to several upper steel sheet rings 3, and One sealing sheet 7. An axially curved notch 10 extending in the circumferential direction is formed on each of the two ends of the slot ring 1 on both sides of the cutout 11, and the sealing piece 7 is inserted into the arced groove formed by the two arced notches 10. As shown in FIG. 4, the sealing sheet 7 includes a main body portion 60 and a protrusion 6 located at one end of the main body portion. Face of cover ring 2 A groove 5 is provided on one side of the groove ring 1. As shown in FIG. 2, the groove 5 is provided at a position of the cover ring 2 substantially opposite to the cover ring cutout 15 and is used for receiving the protrusion 6 of the sealing sheet. The groove 5 is sized to accommodate the entire protrusion 6. In the assembled state shown in FIG. 1, the sealing piece 7 is inserted into the arc-shaped groove of the groove ring, and the axial height HI of the main part of the sealing piece is equal to or slightly lower than the axial thickness of the groove ring 1 so that The notch 11 of the groove ring is blocked from the radial direction over the entire axial height of 1. The groove 5 is axially aligned with the protrusion 6 of the sealing sheet 7 so that the protrusion 6 of the sealing sheet 7 protruding above the upper surface of the groove ring can be inserted therein, so that the protrusion 6 and the groove 5 form a positioning device. It is used to restrict the rotation of the cover ring with respect to the groove ring to prevent the cutout 15 of the cover ring and the cutout 11 of the groove ring from axially aligning to cause leakage. Preferably, the axial height H2 of the protrusion 6 is greater than the maximum axial gap that may occur between the cover ring 2 and the groove ring 1 to ensure the limit effect of the protrusion 6 on the cover ring.

Figures 5 and 6 show two structural forms of the cover ring groove 5, respectively. The groove 5 shown in Figure 5 is open to the inner diameter of the cover ring 2, while the groove 5 shown in Figure 6 is not open to the inner diameter. Regardless of whether the inner diameter of the groove 5 and the cover ring 2 is open or not, in the assembled state of the combined air ring and piston of the present invention, the size of the cover ring groove 5 and the sealing sheet protrusion 6 relative to the groove ring cut 11 The circumferential position is set so that the cover ring groove 5 cannot communicate with the cutout 11 on the groove ring due to the limiting effect of the sealing piece protrusion 6 to avoid high-pressure gas passing through the groove 5 and the cutout portion located radially outward of the sealing piece leakage.

Since the number of each constituent ring of the combined air ring of the present invention can be different, and each of the constituent rings can have different cross-sectional shapes, the combined air ring can have various combinations. However, regardless of the combination form, in the assembled state of the combined air ring in the piston ring-piston assembly installed in the cylinder liner 9, the cutout 11 of the groove ring and the cutout 15 of the cover ring located above it are staggered in the circumferential direction. The sealing sheet 7 is inserted into the arc-shaped groove located at the cut of the groove ring and blocks the cut 11 of the groove ring from the radial direction. The protrusion 6 of the sealing sheet 7 is inserted into the groove 5 matched with it Limiting the rotation of the cover ring relative to the groove ring is a basic feature of the combined air ring. In the assembled state, as shown in FIG. 2, the sealing sheet 7 blocks the notch 11 of the groove ring 1 in the radial direction; the notch 11 of the groove ring and the notch 15 of the cover ring are located at different positions in the circumferential direction and are inserted through The sealing piece protrusion 6 installed in the cover ring groove 5 locks the groove ring and the cover ring in this orientation. Therefore, the high-pressure gas 4 in the cylinder can neither leak downwards directly through the cutouts of any constituent ring, nor can it bypass the ringbacks of each constituent ring and pass through the notch 11 of the groove ring, the piston ring bank 13 and the cylinder wall 14 Leakage occurred in channel 12. It can be seen that the sealing principle of the combined air ring of the present invention to the cylinder has changed. It is no longer the traditional throttling working principle, but is based on the full sealing working principle.

As a modification of the above embodiment, the cover ring 2 may not be formed with a groove, and the sealing sheet does not have a protrusion 6 accordingly. In the assembled state, the top end of the sealing sheet 7 is approximately the same as the upper surface of the groove ring 1. Qi Flat. With this structure, it is preferable to additionally provide a positioning member that prevents the groove ring and the cover ring from relatively rotating in the circumferential direction. In addition, the shape of the notches formed at both ends of the notch of the groove ring is not limited to the above-mentioned arc shape, and other shapes of notches such as linear notches can also be used.

The following describes preferred embodiments of the piston'ring-piston assembly of the present invention with reference to FIGS. 7-10. FIG. 7 is a half cross-sectional view of the first embodiment of the piston ring-piston assembly of the present invention. As shown in FIG. 7, the piston 8 is provided with only one combined air ring 20 of the present invention, which is mainly used for a two-stroke engine. In the embodiment of the piston ring-piston assembly shown in FIG. 8, the piston 8 is provided with two piston rings, and the first ring groove arranged above is the combined air ring 20 of the present invention. In the second ring groove below is an oil ring 30, which is a typical two-ring piston structure. In a conventional piston ring-piston assembly with three piston rings, the upper two piston rings are air rings and the lowermost piston ring is an oil ring. FIG. 9 shows an embodiment of a piston ring-piston assembly having three piston rings according to the invention. The piston used in the piston ring-piston assembly of the present invention shown in FIG. 9 is similar to the piston used in the conventional three-piston ring piston ring-piston assembly, except that the configuration of each piston ring is different: In the third embodiment of the present invention In the piston ring-piston assembly of the example, the first ring located at the top is the combined air ring 20 of the present invention; the second ring located at the middle is the oil ring 30; and the third ring located at the bottom is the third ring The piston ring is a conical ring 40 having a tapered outer peripheral surface. In order to facilitate oil return, oil return holes 50 and pressure relief holes 60 are respectively drilled at the bottom and the bottom of the ring groove where the cone surface ring is located toward the pressure bearing surface of the piston. With this structure, because the operating temperature of the oil ring 30 is increased, and the third piston ring 40 has the function of roughing the oil, the oil scraping effect can be improved while the original compression height is basically unchanged. Reduce oil consumption. For the piston ring-piston assembly of the third embodiment of the present invention, since the piston therein is similar in structure to the existing piston, the piston ring-piston assembly structure of the third embodiment of the present invention can be directly applied to the existing engine Without having to make major improvements to the existing piston structure. FIG. 10 shows another three-piston ring piston ring-piston assembly of the present invention, which is mainly used in a diesel engine. In the piston ring-piston assembly shown in FIG. 10, the first piston ring located at the top is a trapezoidal ring, a cymbal ring or an air ring 70 having another shape in section; the second piston ring located in the middle is the original ring Invented combined air ring 20; the third piston ring located at the bottom is the oil ring 30. In this structure, the air ring 70 located above the combined air ring of the present invention plays a shielding role, and adopts a trapezoidal or cymbal ring, which can solve the problem of the ring groove cementing snap ring. Since the first radon gas ring twists a part of the gas pressure by 70 minutes, the gas pressure of the combined gas ring of the present invention below it is relatively reduced, so this structure is suitable for a diesel engine with a higher pressure, especially a supercharged diesel engine. As can be seen from the piston ring-piston assembly of the above-mentioned four embodiments of the present invention, its basic feature is that it is provided with the combined air ring of the present invention. Single piston ring shown in Figures 7 and 8 And double piston ring piston structure, its gas sealing and oil control performance is much better than the traditional one-piece air ring piston structure. The three-ring piston structure of the present invention shown in FIGS. 9 and 10 can be directly applied to an existing piston.

The preferred embodiments of the present invention have been described above. However, those skilled in the art should understand that the foregoing embodiments are illustrative and not restrictive, and various improvements can be made to the present invention without departing from the spirit and scope of the present invention as defined by the appended claims.

Claims

Request for Profit

1. A combined air ring for a reciprocating piston ring-piston assembly, the combined air ring comprising an elastic groove ring (1), a cover ring (2), and zero to several upper steel plate rings (3) and a sealing sheet (7), wherein, in the assembled state of the combined air ring with the piston (8) and the cylinder liner (9), the cutout (11) on the groove ring (1) and the The cutouts (15) of the cover ring (2) above it are staggered in the circumferential direction, and the sealing piece (7) is installed at the cutouts (11) on the grooved ring (1) so that the grooved ring The cut (11) in (1) is blocked in the radial direction by means of the sealing sheet (7).

2. The combined air ring according to claim 1, further comprising a positioning device for restricting the relative rotation of the groove ring and the cover ring in the circumferential direction to ensure the cover ring cutout (15) and the groove ring cutout (11) Not right

V.

3. The combined air ring according to claim 1, wherein two ends of the groove ring (1) located on both sides of the cutout O) each have an axial arc-shaped groove (10) extending in a circumferential direction. The sealing piece (7) is inserted into an arc groove formed by two curved notches (10), and the axial height (HI) of the sealing piece is equal to or slightly lower than the axial direction of the groove ring (1). height.

4. The combined air ring according to claim 3, wherein the sealing piece (7) has a protrusion protruding toward the cover ring at one end of the sealing piece and higher than the axial height of the groove ring. (6), and the cover ring (2) is formed on a side facing the groove ring (1) with a groove (5) capable of accommodating the entire protrusion paired with the sealing piece protrusion (6) ), In the assembled state, the cover ring groove (5) is axially centered with the sealing piece protrusion (6) fitted in the grooved ring arc groove, and the convexity of the sealing piece (7) The lifting ring (6) is inserted into the cover ring groove (5) to limit the rotation of the cover ring (2) relative to the groove ring (1).

5. The combined air ring according to claim 4, wherein the cover ring groove (5) and the cutout (15) on the cover ring are located at substantially opposite radial positions.

6. The combined air ring according to claim 4, wherein the groove (5) on the cover ring can be opened to the inside diameter of the cover ring or not to be opened to the inside diameter of the cover ring. .

7. The combined air ring according to claim 4, wherein the axial height (H2) of the sealing piece protrusion is greater than the maximum axial gap that may occur between the cover ring and the groove ring.

8. The combined air ring according to claim 4, wherein the size of the cover ring groove (5) and the circumferential position of the sealing sheet protrusion (6) relative to the groove ring cut (11) are set as such It is determined that the cover ring groove (5) cannot communicate with the cutout (11) on the groove ring due to the limiting effect of the sealing sheet protrusion.

9. A piston ring-piston assembly for a reciprocating piston engine, wherein the piston is The combination air ring (20) according to any one of claims 1 to 8 is installed.

10. The piston ring-piston assembly according to claim 9, wherein there is only one combined air ring (20) on the piston ring-piston assembly.

11. The piston ring-piston assembly according to claim 9, wherein the piston ring-piston is a piston ring-piston assembly having two piston rings, and a first ring groove is arranged on the piston. The combined air ring (20) is described, and the second ring groove is provided with an oil ring (30).

12. The piston ring-piston assembly according to claim 9, wherein the piston ring-piston is a piston ring-piston assembly having three piston rings, and a first ring groove is arranged on the piston. The combined air ring (20) is described. The second ring groove is provided with an oil ring (30), and the third ring groove is provided with a tapered surface ring (40) whose outer peripheral surface is a tapered surface.

13. The piston ring-piston assembly according to claim 12, wherein, at the bottom of the third ring groove and below the ring groove, oil return holes (50 ) And Diarrhea (60).

14. The piston ring-piston assembly according to claim 9, wherein the piston ring-piston assembly has a piston ring-piston assembly with three piston rings, and a trapezoid is arranged on the first ring groove of the piston. The air ring (70) of the U-shape or the other shape is configured with the combined air ring (20) in the second ring groove and an oil ring (30) in the third ring groove.