KR100444863B1 - Piston ring - Google Patents

Abstract

The present invention relates to a structure of a piston ring that integrates three conventional piston rings into a single ring, and improves the sealing property of the combustion gas by eliminating gaps in the piston ring.

A piston having only one ring groove formed thereon;

A circular ring shape, the one-sided cross section of which has a "ㅌ" shape with an outer side open and a retainer fitted to the ring groove;

The inner circumferential edge of the fitting portion is inserted into the upper groove of the retainer in a circular ring shape while being elastically supported. A first slide ring having a reduced arc shape;

A second slide ring fitted while being elastically supported in the lower groove of the retainer in a state of being symmetrical with the first slide ring based on the partition wall of the retainer; Characterized in that consists of.

Description

Piston ring structure {Piston ring}

The present invention relates to a structure of a piston ring, and more particularly, to integrate a piston ring, which has been conventionally mounted in one, into one ring, and to remove the incision gap of the piston ring to improve the sealing property of the combustion gas. It relates to the structure of the ring.

In general, the piston ring seals the combustion gas, scrapes the lubricating oil on the cylinder wall appropriately to suppress the lubricating oil consumption as much as possible, and serves as a cooling to transfer the heat of the piston to the cylinder.

6 illustrates a structure in which a piston ring is coupled to a piston. As shown in the figure, a ring groove 11 for fitting a plurality of rings is formed on the upper outer circumferential surface of the piston 10, and the piston ring 12 is fitted into the ring groove 11. The piston ring 12 is made of a circular shape having one side cut to have a gap, it is generally made of two compression rings 13 and one oil ring (14).

The function of the piston ring 12 is maintained by the oil film formed between the perturbation surface and the cylinder 15 according to the reciprocating motion, and the state of the oil film is determined by the speed of the piston and the surface pressure between the piston ring and the cylinder. Therefore, it is necessary to set the minimum surface pressure necessary to maintain the function and at the same time reduce the frictional resistance, and determine the dimensions of each part according to the surface pressure.

The combustion gas is sealed by an oil film on the outer circumference of the compression ring 13. However, it is not possible to prevent the leakage of gas in the gap resulting from the gap between the incision and the initial accuracy, the deformation during operation, and the poor adhesion due to wear. Therefore, in general, the blowby gas pressure is lowered sequentially by using two or three compression rings 13 to reduce the leakage of gas.

The oil ring 14 serves to prevent the lubricant from rising by scraping off the lubricant other than the amount necessary for the function of the compression ring 13, so that the contact width with the cylinder 15 is narrowed to improve the ability to increase the surface pressure and followability. In order to improve the thickness, it is necessary to reduce the thickness and width to suppress the expansion of the gap with the cylinder 15 due to the inclination of the piston ring 12.

The oil ring 14 is generally used with an expander integrated type and combination. Integral oil ring is suitable for low-speed engines that focus on durability. Combination type is mainly used for high-speed engines because of good lubricating oil sealability and good tracking of cylinder deformation. However, when the piston 10 of the engine behaves, a considerable influence is transmitted to the behavior of the piston ring 12 described above.

In order to satisfy the requirements of the piston ring, various design parameters such as ring width, thickness, incision clearance, and tension should be optimized.Parkerizing treatment for initial familiarity or chrome plating or nitriding treatment for improved wear resistance There is a case. In addition, the piston ring occupies about 70% of the total oil consumption of the engine, which is an important part of determining the engine oil consumption.

In order to meet these design requirements, it is necessary to optimize all the design variables. To this end, it is necessary to perform optimization experiments through several trials and errors. It is a very difficult problem.

Therefore, the present invention has been made to solve the above problems, to integrate the three existing piston rings into one ring, and to remove the incision gap of the piston ring to improve the sealing property of the combustion gas It is an object to provide a structure of a piston ring.

The present invention as a means for achieving the above object,

A piston having only one ring groove formed thereon;

A circular ring shape, the one-sided cross section of which has a "ㅌ" shape with an outer side open and a retainer fitted to the ring groove;

The inner circumferential edge of the fitting portion is inserted into the upper groove of the retainer in a circular ring shape while being elastically supported. A first slide ring having a reduced arc shape;

And a second slide ring fitted while being elastically supported in the lower groove of the retainer in a state of being symmetrical up and down with the first slide ring based on the barrier rib of the retainer.

1 is a view of the piston and the piston ring mounted state formed by the present invention.

Figure 2 is an enlarged view showing a state in which the piston ring formed by the present invention is mounted.

Figure 3 is an enlarged cross-sectional view of the piston ring formed by the present invention.

Figure 4 is a view showing the mounting state of the leaf spring according to the present invention.

5 is a view showing an operating state of the leaf spring of the present invention.

Figure 6 is a view for explaining the prior art.

※ Explanation of code for main part of drawing

20: piston 21: ring groove

22: top land portion 23: annular projection

24: coupling hole 25: cylinder liner

30: piston ring 31: retainer

32: bulkhead 34: upper groove

35: lower groove 40: the first slide ring

42: second slide ring 50: leaf spring

52: first plunger 54: second plunger

60: oil passage

Hereinafter, with reference to the accompanying drawings, preferred embodiments according to the configuration and operation of the present invention will be described in detail.

1 is a view of the piston and the piston ring formed by the present invention is mounted, Figure 2 is an enlarged view showing the mounted state of the piston ring formed by the present invention, Figure 3 is formed by the present invention Figure 4 is an enlarged cross-sectional view of the piston ring, Figure 4 is a view showing the mounting state of the leaf spring according to the present invention, Figure 5 is a view showing the operating state of the leaf spring according to the present invention.

Reference numeral 20 shown in the drawings indicates a piston formed by the present invention, and reference numeral 30 indicates a piston ring according to the present invention.

The piston 20 is conventionally formed with only one ring groove 21 on the top, unlike a plurality of ring grooves. In addition, the top land portion 22 of the piston 20 is separated and formed based on the ring groove 21 described above. That is, as shown in the drawing, the annular protrusion 23 is formed at the center of the piston 20, and the coupling hole 24 is drilled in the center of the top land portion 22 to be separated to be coupled to each other. .

Therefore, in the engine manufacturing process, the piston ring 30 is interposed between the ring groove 21 in a state where the top land portion 22 is removed, and then the engaging hole 24 of the top land portion 22 is annular. (23) will be fitted and welded. After welding as described above, it is preferable to remove the machining portion of the upper portion.

The piston ring 30 is inserted into the ring groove 21 and is retained in the retainer 31 for enclosing the parts of the entire piston ring, and accommodated in the upper groove 34 and the lower groove 35 of the retainer 31. It consists of a leaf spring 50 for elastically supporting the first slide ring 40 and the second slide ring 42 in contact with the wall surface of the cylinder liner 25.

First, the retainer 31 has a circular ring shape and its one-sided cross section is formed in a "ㅌ" shape with an outer side open. The outer periphery of the upper wall 31a and the lower wall 31b of the retainer 31 is rounded outside, and the inside thereof is stepped.

In particular, the retainer 31 is fitted in the upper groove 34 and the lower groove 35 so that the first and second slide rings 40, 42 and the leaf spring 50, etc., which are annular. It is preferable that the partition wall 32 is formed to be separated between the upper wall 31a and the lower wall 31b. That is, the parts are inserted into the upper groove 34 and the lower groove 35, and then the incision is welded, and then the weld is processed to remove the beads.

In addition, the first slide ring 40 and the second slide ring 42 are accommodated in the upper groove 34 and the lower groove 35 of the retainer 31, respectively. 42 are each elastically supported by annular leaf springs 50.

That is, an annular leaf spring 50 is formed in the upper groove 34 and the lower groove 35 of the retainer 31 so that the slide rings 40 and 42 collide with the wall surface of the cylinder liner 25. It will buffer the force transmitted in the process.

In particular, the leaf spring 50 is configured in an annular shape in which a sinusoidal curve having a constant pitch is continuous. And the outer side of the leaf spring 50 is formed with a first plunger 52 for supporting the leaf spring 50 is elastically corresponding to the behavior of the piston 20, the leaf spring 50 Inside the second plunger 54 is formed in the upper groove 34 and the lower groove 35 of the retainer 31.

In addition, the first slide ring 40 is in contact with the wall of the cylinder liner 25 in a circular ring shape, the cross-sectional shape of the arc shape in which the longest diameter is located on the lower side and the diameter of the outer circumference decreases toward the upper side The inner side is stepped, and the fitting part 41 which is thinner than the outer peripheral side is formed. That is, the fitting portion 41 of the first slide ring 40 is to be fitted into the upper groove 34 of the retainer 31.

In the second slide ring 42, the first slide ring 40 is symmetrically formed with respect to the partition wall 32 of the retainer 31.

In addition, an oil passage 60 is formed in the middle of the lower wall 31b of the retainer 31 and in the middle of the main body of the piston 20 such that the lower groove 35 connects the crank cases to each other.

Referring to the operation of the present invention formed as described above are as follows.

When the engine is started and the piston 20 moves up and down, the piston ring 30 is freely moved in the radial direction, and the elasticity is greatly improved.

That is, the force transmitted while the first slide ring 40 and the second slide ring 42 hit the wall of the cylinder liner 25 is buffered by the leaf spring 50.

In particular, the plate spring 50 is the first plunger 52 is pressed by the plate spring 50 when the force is transmitted to the side when the piston 20 moves as shown in FIG. The leaf spring 50 is to buffer the force to one side.

That is, when the first slide ring 40 and the second slide ring 42 are in close contact with the cylinder liner 25, the cylinder liner 25 and the piston 20 may move along the up and down movement of the piston 20. When the piston ring 30 moves in an unpredictable form, such as a gap, a gap between the piston ring 30 and the ring groove 21, the state of movement of the piston ring 30 changes every time. In this case, the first plunger 52 moves left and right by the elasticity of the leaf spring 50 in the retainer 31, and the first slide ring 40 and the second slide are driven by the first plunger 52. The ring 42 makes a relative motion of different forms.

When the gap with the cylinder liner 25 increases, the gap decreases, and when the gap with the cylinder liner 25 decreases, the first slide ring 40 and the second slide ring 42 are different from each other. Will move. In this way, the first slide ring 40 and the second slide ring 42 move relative to each other according to the movement state of the piston 20 and the piston ring 30, thereby improving the followability, airtightness, and wear resistance. In addition, the oil scraped off by the movement of the first slide ring 40 and the second slide ring 42 is the oil passage 60 formed between the lower wall 31b of the retainer 31 and the main body of the piston 20. Through the crankcase.

In the present invention formed as described above, the piston ring, which has been formed in the past, is formed as a single piston ring, so that the number of parts is reduced, as well as the assembly process and manufacturing cost are reduced, and the first slide ring and the second slide ring are The relative movement between the piston and the cylinder liner is adjusted, thereby improving the followability, airtightness, and wear resistance of the piston and piston ring.

Claims (11)

A piston 20 having only one ring groove 21 formed thereon; A circular ring shape, the one-sided cross section of which has a "ㅌ" shape with an outer side open, the retainer 31 being fitted into the ring groove 21; The inner circumference of the fitting portion 41 is inserted into the upper groove 34 of the retainer 31 in a circular ring shape while being elastically supported, and the cross-sectional shape of the outer circumference which comes into contact with the wall surface of the cylinder liner 25 is A first slide ring 40 formed in an arc shape in which the diameter portion is located below and the diameter of the outer circumference thereof decreases toward the upper side; A second that is fitted while being elastically supported in the lower groove 35 of the retainer 31 in a state of being symmetrical up and down with the first slide ring 40 based on the partition wall 32 of the retainer 31. Slide ring 42; In the structure of the ring of the piston configured to include, The outer circumferential diameter of the center partition wall 32 of the retainer 31 is formed smaller than the outer circumference of the upper wall 31a and the lower wall 31b, The inner ring side of the first slide ring (40) and the second slide ring (42) of the piston ring structure, characterized in that each annular plate spring (50) is interposed. delete delete delete The method of claim 1, Each of the leaf springs 50 is formed in an annular shape as a whole, the structure of the piston ring, characterized in that the sine curve having a predetermined pitch is formed continuously. The method of claim 1, The outer circumferential side of each of the leaf spring 50 is characterized in that the first plunger 52 for supporting the outer side of the leaf spring 50, which is elastically corresponding to the behavior of the piston 20 is formed The structure of the piston ring. The method of claim 1, The inner circumferential side of each of the leaf springs (50), the second plunger (54) is a structure of the piston ring, characterized in that formed in the upper groove (34) and the lower groove (35) of the retainer (31). delete The method of claim 1, The outer periphery of the upper wall (31a) and the lower wall (31b) of the retainer (31), the outer side is rounded, the inner side of the structure of the piston ring is formed stepped. The method of claim 1, The structure of the piston ring, characterized in that the oil passage (60) is formed to communicate with each other in the middle of the lower wall (31b) of the retainer (31) and the body of the piston (20). The method of claim 1, The upper wall 31a, the lower wall 31b and the partition wall 32 of the retainer 31 are formed separately, and the upper groove 34 has a first sliding ring 40, a leaf spring 50, The first and second plungers 52 and 54 are accommodated, and the lower groove 35 receives the second sliding ring 42, the leaf spring 50, and the first and second plungers 52 and 54. And the side wall and the inner circumferential wall of the upper wall (31a) and the inner circumferential wall of the lower wall (31b) are welded to each other.