KR20170027063A

KR20170027063A - A piston ring turning structure

Info

Publication number: KR20170027063A
Application number: KR1020150123507A
Authority: KR
Inventors: 손상철
Original assignee: 현대자동차주식회사
Priority date: 2015-09-01
Filing date: 2015-09-01
Publication date: 2017-03-09

Abstract

The present invention relates to a piston ring forced rotation structure for preventing the end gaps of the piston rings from being superimposed on one another in a piston having a cooling gallery formed therein for cooling and formed with grooves for a plurality of piston ring rings on the outer circumferential surface As a result,
And an oil supply hole for forcibly driving the piston ring is formed in the cooling gallery to supply the pressurized cooling oil of the cooling gallery to the end gap end surface of the piston. Thus, the end gap is formed in the ring groove The piston rings are rotated by the pressure of the oil supplied through the holes, thereby preventing the end gaps of the piston rings from overlapping with each other without the need of adding new parts. There is an effect that can be immediately applied to the existing piston ring.

Description

Piston Ring Rotating Structure

The present invention relates to a piston ring forced rotation structure for forcibly rotating piston rings mounted on a piston of an automobile, and more particularly, to a piston ring forced rotation structure in which a piston ring And more particularly to a piston ring forced rotation structure that is adapted to forcibly rotate a piston ring.

Generally, a piston reciprocating in a cylinder of an automobile is equipped with a plurality of piston rings, typically, the piston rings include a top ring for sealing between the cylinder and the piston to prevent gas from leaking out of the cylinder, A second ring for keeping the thickness of the oil film at the inner wall of the cylinder constant with the seal and a lower oil ring for scraping off oil from the cylinder wall to prevent the oil from flowing into the combustion chamber, .

Clearances are necessarily required between the piston and the cylinder inner wall. However, it is preferable that the gap is minimized considering the expansion and contraction due to the heat of the piston ring since gas does not leak or the oil does not flow back through the gaps.

Generally, the piston rings are cut for assembly to the piston to form an end gap with a predetermined gap. The end gap of the top ring is designed to be smaller than the end gap of the second ring. This is because the combustion pressure during the explosion stroke causes the ring behavior and stability of the ring behavior during intake stroke will be.

Such an end gap may be an unburned gas during the combustion stroke, that is, a passage through which blowby gas is discharged to the outside and an oil consumption passage. In order to prevent the problem of the end gap, the piston rings are usually disposed at an angle of 90 degrees. However, the piston rings are moved by the engine operation, and the end gaps may be matched with each other.

As an example of the technique for minimizing the problem of the end ring of the piston ring, Korean Patent Laid-Open No. 10-2006-0070199 discloses a piston ring for filling the space of the end gap by using a spring and an adapter, Japanese Patent Application Laid-Open No. 10-2006-0066249 discloses a piston top ring structure in which a top ring is formed in a spiral shape in the shape of a coil spring and an upper ring, a middle ring, and a lower ring to maintain the shape of a closed curve.

However, the above-mentioned prior art techniques have a complicated structure and a problem of layout when the piston is mounted.

Korean Patent Publication No. 10-2006-0070199 Korean Patent Publication No. 10-2006-0066249

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems of the prior art by providing an anti-glare device in which, when an end gap is provided through a hole formed in a ring groove for mounting a piston ring And to provide a piston ring forced rotation structure with an improved structure to prevent overlapping by forcibly rotating the piston ring by the pressure of the oil.

In order to achieve the above object, the piston ring forced rotation structure according to the present invention is characterized in that in a piston having a plurality of piston ring grooves formed on the outer circumferential surface thereof and having a cooling gallery formed therein for cooling, In order to prevent the piston rings from being arranged in a superimposed manner,

And an oil supply hole for forcibly driving a piston ring formed in the cooling gallery to supply the pressurized cooling oil of the cooling gallery to the end gap end surface of the piston.

Preferably, the oil supply hole is branched at the height corresponding to the grooves for each piston ring so as to be communicated from the upper surface of the grooves to at least one selected from the bottom surface

The oil supply holes are preferably arranged at a plurality of locations in the circumferential direction of the ring grooves on the outer circumferential surface of the piston at a predetermined angle in a cooling gallery formed annularly from both sides of the piston.

Two oil supply holes formed in the cooling gallery are formed at four positions, and two opposing ones of the oil supply holes are formed at positions corresponding to the ends of the top ring or the second ring, while one of the other two positions corresponds to the end of the coil spring And the other one may be formed at a position corresponding to the oiling end.

It is also preferable that the oil supply holes are inclined so that the cooling oil supplied from the oil supply hole is directed to the end face of the end gap when the end gap of the piston ring is located.

According to the present invention, when the end gap is located in the hole formed in the ring groove, the piston ring is rotated by the pressure of the oil supplied through the hole, thereby preventing the end gap of the piston rings from overlapping . There is an advantage that it can be immediately applied to existing piston rings.

1 is a schematic perspective view of a piston assembly of an improved construction according to the present invention;
Figure 2 is a perspective view schematically illustrating a cooling gallery shape for mounting piston rings in the piston assembly of Figure 1;
Fig. 3 is a schematic cross-sectional view and partial enlarged view for explaining the action of oil supplied from the cooling gallery of Fig. 2; Fig.
Fig. 4 is a view for explaining an action of forcefully rotating a piston ring by operating oil supplied from a cooling gallery in Fig. 3;

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described more fully hereinafter with reference to the accompanying drawings, in which embodiments of the invention are shown.

1 and 2, a piston 1 formed with grooves 3 for a plurality of piston rings 2 is formed with oil supply holes 10 extending from a cooling gallery 5 formed for cooling do.

Regarding the formation of a cooling gallery in a piston, in the "apparatus for improving the cooling efficiency of a piston " of the registered domestic patent application No. 10-0427068 (registered April, 2004) An oil inlet for introducing oil supplied from the oil jet installed on the lower side of the piston is formed at one side of the flow passage, and an oil inlet And the first outlet is formed vertically downward.

The cooling gallery 5 according to the present invention utilizes the principle of a flow passage for cooling a piston ring in the prior art, and is formed to be bent at positions corresponding to the grooves for each piston ring, and is formed at a height corresponding to the grooves for each piston ring Thereby forming oil supply holes 10 communicating with the upper and lower surfaces of the grooves.

The cooling gallery 5 may be formed as one engine oil passage as in the case of a conventional flow passage for cooling a piston ring. However, as shown in the embodiment shown in the drawing, It is advantageous to obtain the oil supply pressure to such an extent that

The cooling gallery 5 is formed by inserting a salt core having a predetermined curvature at a predetermined position at the time of casting the piston, casting the piston, and then removing the salt core to form a cooling oil passage It is widely known. Such a salt core can be formed by bonding the salt with a binder or sintering the salt horses.

According to the present invention, an oil supply hole 10 for forcibly driving a piston ring formed by branching in the cooling gallery 5 is formed so that the cooling gallery is opened to the upper surface or the bottom surface of the piston ring grooves at the time of forming the cooling gallery, And then casting the shaped portions in an inclined manner.

It is preferable that the oil supply hole 10 is disposed at at least four positions in the circumferential direction of the ring grooves of the outer circumferential surface of the piston at an angle of 90 degrees to the cooling gallery 5 formed at both sides in the piston. Two opposed two of the four oil supply holes 10 are formed at positions corresponding to the ends of the top ring or the second ring while one of the other two is formed at a position corresponding to the end of the coil spring, And is formed at a position corresponding to the end of the oil ring.

3 and 4, according to the present invention, the cooling oil is pressurized in the oil supply hole 10 formed obliquely toward the bottom of the ring groove 3 in the cooling gallery 5 of the piston, The cooling oil supplied obliquely in this manner is directed toward the end face of the end gap when the end gap 11 of the piston ring 2 is positioned, so that the force in the lateral direction acts on the piston ring in the direction of the arrow, The piston ring is forcibly rotated by the oil in the piston ring groove.

As described above, the piston rings are oillessly ejected from the three piston ring grooves at four 90-degree angularly spaced positions, so that the three piston rings can be arranged in such a manner that their end gaps do not overlap each other The end gaps of the piston rings are arranged so as to overlap with each other so that unburned gas in the combustion stroke, that is, the blowby gas, is discharged to the outside and the oil is prevented from leaking.

The present invention can be used to prevent the end gaps of the piston rings mounted on the automobile's pistons from overlapping.

1: Piston 2: Piston ring
3; Groove 5: Cooling Gallery
10: Oil supply hole

Claims

A piston ring forced rotation structure for preventing a plurality of piston ring grooves formed on an outer circumferential surface from overlapping the end gaps of the piston rings in a piston having therein a cooling gallery formed for cooling,
And a piston ring forcibly driven oil supply hole formed in the cooling gallery so as to supply the pressurized cooling oil of the cooling gallery to the end gap end surface of the piston.

2. The piston ring forced rotation structure according to claim 1, wherein the oil supply hole is branched at a height corresponding to the grooves for each piston ring so as to communicate with the upper surface of the grooves and at least one selected from the bottom surface.

The forced rotation structure for a piston ring according to claim 1, wherein the oil supply holes are arranged at a plurality of locations in the circumferential direction of the ring grooves on the outer circumferential surface of the piston at predetermined angles in a cooling gallery formed annularly from both sides of the piston.

4. The apparatus of claim 3, wherein four oil supply holes are formed in the cooling gallery, wherein two opposing oil supply holes are formed at positions corresponding to ends of the top ring or the second ring, Wherein the piston ring is formed at a position corresponding to an end of the coil spring and the other is formed at a position corresponding to the end of the oil ring.

2. The piston ring forced rotation structure according to claim 1, wherein the oil supply holes are inclined so that the cooling oil supplied from the oil supply hole is directed to the end face of the end gap when the end gap of the piston ring is located.