JPH023011Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a piston ring device used in an internal combustion engine, and more specifically to a combination oil ring device.

(Prior art) The function of the oil ring is to seal the lubricating oil from entering the combustion chamber, scrape off excess lubricating oil present on the cylinder inner wall and return it to the oil pan, and always maintain an appropriate lubricating oil film on the cylinder inner wall. It is about forming.

Conventionally, as a combination oil ring that performs the above functions, for example, as shown in FIG. 7, a combination of two side rails 101, 101 and one spacer expander 102 has been widely used.

Such a so-called three-piece combination oil ring transmits tension to the two side rails 101, 101 by one spacer expander 102, and the inner wall of the cylinder C and the oil seal groove 10.
3. Since the seal is applied to the upper and lower surfaces, the following problems arose.

That is, if there are significant irregularities on the inner wall surface of the cylinder C, the ability of one side rail 101 to follow the inner wall surface of the cylinder C will be inhibited, resulting in a drop in surface pressure or an inability to follow the inner wall surface of the cylinder C, resulting in a problem with the sealing function. This sometimes occurred.

(Problems to be Solved by the Invention) In view of the conventional combination oil described above, the present invention is designed to reduce the sealing function even when the piston swings violently or when there are significant irregularities on the inner wall surface of the cylinder. The purpose of the present invention is to provide a novel combination oil seal device.

(Means for solving the problem) The combination oil ring according to the present invention is characterized in that the seat ring 2 is connected to the oil ring so that the inner peripheral surface of the seat ring 2 having the abutment is in contact with the back surface of the oil ring groove 1. a spring ring 3 disposed in the groove 1, having protrusions 3, 3' and pressure receiving parts 3c, 3'c on the upper and lower sides of the seat ring 2, respectively, and having an abutment;
3', and the protrusions 3 of the spring rings 3, 3' are provided.
b, 3'b and a rail ring 4 having an abutment so as to be held by pressure receiving parts 3c, 3'c are combined.

(Function) The oil ring groove 1 is divided into upper and lower parts by the seat ring 2, and the spring rings 3, 3' and the rail ring 4 are arranged above and below the seat ring 2, so the upper and lower rail rings 4 are independent from each other. and move.

In addition, since the seat ring 2 is in contact with the back surface of the oil ring groove 1 in a lined state or with zero tension, the lubricating oil in the space where the lower spring rings 3, 3' and the rail ring 4 are arranged infiltrates toward the combustion chamber. I won't let you.

(Example) Examples of the present invention will be described below.

1 to 4 illustrate an embodiment of the present invention, in which 1 is an oil ring groove formed in a piston P, 2 is a seat ring having an abutment S as shown in FIG. It is arranged in the ring groove 1 so as to be in contact with the back surface of the oil ring groove 1 in a lined state or with zero tension. 3 is a spring ring having an abutment, which is arranged above and below the seat ring. As is clear from the developed view of FIG. 2, the spring ring 3 is made by bending a strip-shaped thin plate with a large number of notches 3a alternately formed on both sides of the plate in the same direction along the two-dot chain line, and forming protrusions 3b on both sides. A pressure receiving surface 3c is formed and then formed into a ring shape.
4 is a rail ring with the same shape as seat ring 2,
The spring ring 3 is arranged vertically so as to be held between the protrusion 3b and the pressure receiving surface 3c. FIG. 4 illustrates the operating state of the first embodiment when the piston P swings, showing the upper and lower rail rings 4,
4, it can be seen that all of them follow the inner wall surface of cylinder C well.

5 and 6 illustrate another embodiment of the present invention, which has the same structure as the previous embodiment except for the shape of the spring ring. That is, as is clear from the developed view of FIG. 6, the spring ring 3' is made by bending a strip-shaped thin plate with a number of notches 3'a alternately formed on both sides of the plate along the two-dot chain line, and forming a protrusion 3' on one side. b, and then formed into a ring shape. Therefore, the rail rings 4, 4 are held by the projection 3'b and the outer peripheral edge 3'c of the spring ring 3'.

(Effects of the invention) As can be seen from the above explanation, the invention has the following effects.

(1) The oil ring groove is divided into upper and lower parts by a seat ring, and a spring ring and a rail ring are arranged above and below the seat ring, so the rail rings can move independently, and therefore the piston Even when the cylinder swings violently or when the cylinder inner wall surface has significant unevenness, both rail rings follow the cylinder inner wall surface well and can perform a sufficient seal.

(2) Since the seat ring is in contact with the back surface of the oil groove in a lined state or with zero tension, it is possible to prevent the lubricating oil in the space where the lower spring ring and rail ring are arranged from penetrating into the combustion chamber.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the present invention, in which Figure 1 is a longitudinal sectional view showing a combination oil ring device, Figure 2 is a developed view of the spring ring shown in Figure 1, and Figure 3 1 is a perspective view showing the shapes of the seat ring and rail ring shown in FIG. 1, and FIG. 4 is a longitudinal sectional view showing the operating state of the combination oil ring device shown in FIG. 1. 5 and 6 show other embodiments of the present invention, in which FIG. 5 is a longitudinal sectional view showing a combination oil ring device, and FIG. 6 is a developed view of the spring ring shown in FIG. 5. FIG. 7 is a longitudinal sectional view of a conventional combination oil ring device. 1...Oil ring groove, 2...Seat ring,
3, 3'...Spring ring, 3c, 3'c...Pressure receiving part, 3b, 3'b...Protrusion, 4...Rail ring.

Claims (1)

[Scope of utility model registration request] A seat ring is arranged in the oil ring groove so that the inner peripheral surface of the seat ring having an abutment is in contact with the back surface of the oil ring groove, and a spring ring having an abutment and a protrusion and a pressure receiving part on the upper and lower sides of the seat ring is installed. 1. A combination oil ring device comprising: a rail ring having an abutment so as to be held by the protrusion of the spring ring and the pressure receiving portion;