KR20040020700A - Oil ring mounting apparatus of piston - Google Patents

Abstract

PURPOSE: A structure for mounting an oil ring of a piston is provided to reduce the oil film layer on a cylinder wall to reduce the oil consumption since upper and lower side rails of the oil ring expand and compress according to the movement direction of a piston. CONSTITUTION: A structure for mounting an oil ring of a piston includes a ring groove(21) have upper and lower slant parts(22,23) defined with respect to an oil hole(24) on an inner periphery, and upper and lower annular side rails(31,32) respectively positioned at the upper and lower parts of the ring groove to scratch oil from the wall of a cylinder when a piston(20) moves up and down. A plurality of links(33) are radially disposed to connect inner peripheries of the upper and lower side rails by a predetermined angle. Annular expanders(34) are axially supported to the centers of the links by annular hinge shafts(35). The axially supported parts of the annular expanders are branched into two parts toward an opened outside of the ring groove. The branched upper parts(34b) are near the upper side rail while the others(34c) are near the lower side rail.

Description

Oil ring mounting apparatus of piston

The present invention relates to an oil ring mounting structure of the piston, and more particularly, the upper and lower side rails of the oil ring scraping oil of the cylinder wall during the operation of the piston are configured to expand and compress according to the operation direction of the piston. Therefore, the present invention relates to an oil ring mounting structure of a piston, which reduces the oil layer of the cylinder wall, thereby reducing the consumption of oil.

The role of the piston ring in the engine is to maintain the tightness of the combustion chamber against compression and expansion gas pressure, to prevent the expansion gas from leaking from the combustion chamber into the crankcase and to transfer most of the heat received to the cylinder wall. In addition, the oil sprayed on the cylinder wall is scraped off to form the required minimum oil film and at the same time, the remaining oil is prevented from entering the combustion chamber and rising. Among these, the ring mainly used for airtightness is called a compression ring, and the ring that scrapes oil is called an oil ring. Automotive gasoline engines typically use two compression rings and one or two oil rings.

Such piston rings play a big role in improving engine performance and durability, and various types of compression rings having different structures and shapes have been developed.

FIG. 6 is a view illustrating a state in which a conventional general oil ring is mounted on a piston. An annular ring groove 11 having a predetermined depth is formed on an upper portion of the piston 10, and a joint gap is formed in the ring groove 11. An annular oil ring 12 is fitted. The conventional oil ring 12 is composed of an annular ring having a U-shaped cross section, as shown in the drawing, so that oil drawn from the cylinder wall can be guided to the oil hole 13 formed in the piston 10. It is composed.

However, the conventional oil ring should maintain the minimum oil film necessary for lubrication. However, when excessive tension is generated in the process of forming the minimum oil film, the amount of oil flowing into the combustion chamber increases rapidly. It acts as a resistance. Therefore, there is no method to control the oil inflow in the combustion chamber by maintaining the optimum condition for the up and down movement of the piston. Therefore, the piston is designed after seeing that the smallest amount of oil is consumed or flowed through many tests. I'm doing it.

The present invention has been made to solve the above problems, the upper and lower side rails of the oil ring scraping the oil of the cylinder wall during the operation of the piston is configured to expand and compress according to the operating direction of the piston It is an object to provide an oil ring mounting structure of a piston which reduces the oil layer of the wall, thereby reducing the consumption of oil.

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

In the structure that the ring groove is formed in the upper portion of the piston, the oil ring for scraping off the oil of the cylinder wall is fitted in the ring groove,

A ring groove having upper and lower portions of the inner circumference formed as an inclined surface based on the oil hole;

An annular upper side rail positioned at an upper side of the ring groove and serving to scrape oil from the cylinder wall when the piston descends;

An annular lower side rail positioned at the lower side of the ring groove and serving to scrape oil from the cylinder wall when the piston is raised;

A plurality of links arranged in an annular shape to connect the inner circumferences of the upper side rail and the lower side rail at predetermined angular intervals;

It is held in the center of the links by an annular hinge axis, the ledge being bifurcated toward the open outer side of the ring groove, the branched upper side being proximate to the upper side rail, and the lower side to the lower side rail. An annular expander having an adjacent cross-sectional shape; Characterized in that comprises a.

1 is a cross-sectional view of an oil ring according to the present invention.

Figure 2 is a perspective view showing a portion of the oil ring formed by the present invention cut.

3 is a state in which the oil ring formed by the present invention is mounted to the piston.

4 and 5 is an operating state diagram of the oil ring according to the present invention,

4 is a view showing a case where the piston is lowered.

5 is a view showing a case in which the piston is raised.

6 is a view for explaining a conventional technology.

※ Explanation of code for main part of drawing

20: piston 21: ring groove

22: upper inclined surface 23: lower inclined surface

24: oil hole 25: cylinder wall

30: oil ring 31: upper side rail

32: lower side rail 33: link

34: expander 34d: through hole

35: annular hinge shaft 36: annular ring

Hereinafter, preferred embodiments of the oil ring according to the present invention will be described in detail with the accompanying drawings.

1 is a cross-sectional view of the oil ring according to the present invention, Figure 2 is a perspective view showing a portion of the oil ring formed by the present invention, Figure 3 is a state in which the oil ring formed by the present invention is mounted to the piston Figure 4 and Figure 5 and Figure 5 is an operating state diagram of the oil ring according to the present invention, Figure 4 shows a case where the piston is lowered Figure 5 shows a case where the piston is raised.

Reference numeral 20 shown in the drawing indicates a piston formed by the present invention, and reference numeral 30 indicates an oil ring formed by the present invention.

The piston 20 has a ring groove 21 for fitting a piston ring to the upper portion of the piston 20 like a conventional piston. The cross-sectional shape of the ring groove 21 is an oil hole formed to return oil. On the basis of 24, the upper and lower portions are formed as inclined surfaces (22, 23). That is, one side cross-sectional shape of the ring groove 21 is' It is composed of shapes.

The oil ring 30 includes an upper side rail 31, a lower side rail 32, a link 33 connecting the upper and lower side rails 31, 32, and the link 33. It is hinged to the upper side rail 31 and the lower side rail 32 and expander 34 to guide the expansion and compression is composed of.

The upper and lower side rails 31 and 32 are formed in an annular shape having a predetermined width, and one side of the upper and lower side rails 31 and 32 is formed with a gap (not shown) for allowing the diameter of the ring to be expanded or compressed.

In addition, the link 33 hinges the inner circumferential side of the upper side rail 31 and the lower side rail 32 positioned up and down while maintaining a predetermined distance, and the upper and lower parts of the annular shape are hinged. The side rails 31 and 32 are arranged in an annular shape at predetermined angular intervals. That is, the upper side rail 31 and the lower side rail 32 are configured to uniformly expand and compress by the plurality of links 33.

On the other hand, the centers of the respective links 33 arranged in an annular shape are axially coupled by the annular hinge shaft 35.

And the annular hinge shaft (35) connecting the links (33) is to axially expand the annular expander (34). The cross-sectional shape of the expander 34 has a branched portion 34a, which is supported by the annular hinge shaft 35, bifurcated toward the open outer side of the ring groove 21. 'In shape, the upper portion 34b is formed to be close to the upper side rail 31, the lower portion 34c is formed to be close to the lower side rail (32). In addition, a through hole 34d for passing oil scraped from the cylinder wall 25 by the upper side rail 31 or the lower side rail 32 into the oil hole 24 is provided in the middle of the expander 34. It is formed at predetermined intervals.

An annular ring 36 for cushioning is interposed between the upper and lower side rails 31 and 32 and the upper portion 34b and the lower portion 34c of the expander 34, respectively. The cross section of the annular ring 36 is formed in a small circular shape so as to reduce the friction and guide the movement when the expander 34 is expanded in the circumferential direction or compressed in the center direction of the circle. In order to install the annular ring 36, a part of the annular ring 36 is fitted to the upper surface of the upper portion 34b and the lower surface of the lower portion 34c of the expander 34, respectively. The fitting groove 37 is formed. The fitting groove 37 is preferably formed in a double so that the annular ring 36 can be fitted in a double.

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

When the engine is started, the piston moves up and down at high speed, and oil is injected into the crankcase to lubricate and cool the engine.

In this process, the oil ring 30 fitted into the ring groove 21 of the piston 20 forms an oil film while scraping off the oil remaining on the cylinder wall 25.

However, the upper side rail 31 and the lower side rail 32 of the oil ring 30 according to the present invention extend or extend in accordance with the movement direction of the piston 20 based on the expander 34 and the annular hinge shaft 35. Compressed

First, when the piston 20 is downward, the oil ring 30 is in close contact with the upper surface of the ring groove 21, at which time the inner circumferential surface of the upper side rail 31 moves along the upper inclined surface 22. As a result, its diameter is expanded. The lower side rail 32 is then compressed based on the annular hinge shaft 35. Therefore, the upper side rail 31 scrapes off the oil layer adhered to the cylinder wall 25, and this oil is led to the oil hole 24 through the through hole 34d penetrated in the middle of the expander 34.

On the contrary, when the piston 20 is upward, the oil ring 30 is in close contact with the lower surface of the ring groove 21. At this time, the inner circumferential surface of the lower side rail 32 moves along the lower inclined surface 23. As a result, its diameter is expanded. The upper side rail 31 is then compressed based on the annular hinge shaft 35. Therefore, even when the piston 20 is raised, the oil adhering to the cylinder wall 25 is scraped off. The scraped oil is led to the oil hole 24 through the through hole 34d formed in the middle of the expander 34.

In this way, the behavior of the upper side rail 31 and the lower side rail 32 is adjusted according to the movement direction of the piston 20 by the upper inclined surface 22 and the lower inclined surface 23 formed on the inner circumferential surface of the ring groove 21. Not only when the piston 20 is lowered, but also when the piston 20 is raised, the oil remaining on the cylinder wall 25 is scraped off.

According to the present invention configured as described above, the behavior of the upper side rail and the lower side rail of the oil ring is adjusted according to the direction of movement of the piston by the upper inclination angle and the lower inclination angle formed on the inner circumferential surface of the ring groove, so that the piston is not only downward but also the piston. In this ascending process, the oil remaining on the cylinder wall is scraped off. Therefore, the oil film of the cylinder wall is minimized, thereby minimizing the amount of oil flowing into the combustion chamber, thereby improving engine performance and reducing oil consumption.

Claims (3)

In the structure that the ring groove is formed in the upper portion of the piston, the oil ring for scraping off the oil of the cylinder wall is inserted into the ring groove, A ring groove 21 having upper and lower portions of the inner circumference formed as an inclined surface based on the oil hole 24; An annular upper side rail 31 positioned on the upper side of the ring groove 21 and serving to scrape oil from the cylinder wall 25 when the piston 20 descends; An annular lower side rail 32 positioned at the lower side of the ring groove 21 and serving to scrape oil from the cylinder wall 25 when the piston 20 is raised; A plurality of links 33 arranged in an annular shape connecting the inner circumferences of the upper side rail 31 and the lower side rail 32 to each other at predetermined angular intervals; It is held in the center of the link 33 by the annular hinge shaft 35, the bearing portion 34a is bifurcated into two branches toward the open outer side of the ring groove 21, the branched upper portion 34b ) Is formed close to the upper side rail 31, the lower portion 34c has an annular expander 34 having a cross-sectional shape that is formed adjacent to the lower side rail (32); Oil ring mounting structure of the piston, characterized in that comprises a. The method of claim 1, An oil ring mounting structure of the piston, characterized in that between the upper and lower side rails (31, 32) and the upper and lower sides of the expander (34) is provided with an annular ring (36) for buffering, respectively. The method of claim 1, The through hole for introducing oil scraped from the cylinder wall 25 by the upper side rail 31 and the lower side rail 32 to the oil hole 24 during the axial portion 34a of the expander 34. An oil ring mounting structure of a piston, characterized in that (34d) is formed.