JPS61233268A - Combination oil ring - Google Patents

Abstract

PURPOSE:To improve sealing ability, by a method wherein a tongue piece is cut and risen in an internal projection and in a range, extended between coupling members, toward the external periphery side. CONSTITUTION:A tongue piece 7 is cut and risen in an internal peripheral projection 2 of a spacer expander and in a range, extended between coupling members 3 thereof, toward an external periphery side, and pressure collecting surfaces 71 are formed integrally with the tongue piece at upper and lower ends in the direction of an axis of the forward end of the tongue piece. Thus, the pressure collecting surfaces 71, formed to the forward end of the tongue piece, are positioned between pressure collecting surfaces 11 formed to an external projection 1. This reduces a gap between the pressure collecting surfaces to half that of a conventional type, resulting in production of about uniform surface pressure at a side rail 4 throughout the whole periphery thereof and in reliable seal.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an oil ring used for lubricating oil control among piston rings used in a reciprocating internal combustion engine. More specifically, a spacer expander, and sides that are disposed above and below the spacer expander and are pressed in the outer circumferential direction by the spacer expander to come into pressure contact with the inner wall surface of the cylinder and also with the upper and lower surfaces of the ring groove of the piston. This invention relates to an improvement of a combination oil ring consisting of a rail.

<Prior art> In a reciprocating internal combustion engine, as the piston reciprocates, lubricating oil is efficiently scraped from the inner wall of the cylinder and skillfully circulated back to prevent it from entering the combustion chamber. An oil ring is installed in the ring groove. Various modifications have been made to the shape of such oil rings in order to improve not only their material quality but also their functionality. An example of an oil ring that has been widely used in the past is the oil ring disclosed in Japanese Patent Publication No. 33-10104. This oil ring is an oil ring as shown in Fig. 4.5, and the spacer expander used in this oil ring is composed of a corrugated flat plate as a whole as shown in Fig. 4, and the corrugation is a series of outer Convex portions 1 and inner convex portions 2 are provided alternately, and these convex portions 1.2 are connected by a connecting member 3 extending in the radial direction.

A projection 21 is integrally provided on the upper and lower end surfaces of each inner convex portion, and a pressure receiving surface 11 is integrally provided on the upper and lower edges of the outer convex portion in the axial direction. It is a directional wave type spacer expander.

A pair of side rails 4 are assembled on both upper and lower end surfaces of this spacer expander as shown in FIG. 5, and the spacer expander is used by being mounted in a piston ring groove 51 provided in a piston 5.

This combination oil ring transmits the tension of the spacer expander to the side rail supported by the pressure-receiving surface 11 via the protrusion 21 that is inclined toward the inner circumference, and causes the side rail to be attached to the inner circumferential surface of the cylinder 6. 61 and the upper and lower surfaces 52 and 53 of the piston ring groove to seal and control the lubricating oil.

However, due to the recent effects of high output and high rotation,
Problems have arisen with sealing between the upper and lower surfaces of the piston ring groove.

<Problems to be Solved by the Invention> As mentioned above, in the conventional combination oil ring, the sealing on the upper and lower surfaces of the piston ring groove is insufficient, and the lubricating oil cannot be sufficiently controlled, resulting in an increase in lubricating oil consumption. I was invited.

The present invention focuses on this point and attempts to solve the conventional defects by improving the sealing performance on the upper and lower surfaces of the piston ring groove.

At the same time, it is an attempt to improve the followability of the side rail to the inner circumferential surface of the cylinder.

<Means for Solving the Problems> In order to solve the above problems, the present invention consists of an annular corrugated flat plate as a whole, and the corrugation has a series of outer convex portions and a series of inner convex portions alternately. The two convex portions are connected by a connecting member extending in the radial direction, and the upper and lower axial edges of the inner convex portion are provided with protrusions integrally therewith, and the upper and lower axial edges of the outer convex portion are provided with protrusions. This is a combination oil ring consisting of a spacer expander whose edge is integrally provided with a pressure receiving surface and a pair of side rails disposed above and below the spacer expander, and is constructed as follows.

That is, the problem is solved by cutting and raising the tongue toward the outer circumferential side over the inner convex portion of the spacer expander and the connecting member, and providing pressure-receiving surfaces integrally with the top and bottom of the tip of the tongue in the axial direction. This is what I did.

More preferably, the pressure-receiving surfaces provided above and below in the axial direction of the tip of the tongue and the pressure-receiving surfaces of the upper and lower axial edges of the outer convex portion are preferably located on the same circumference.

<Function> As described above, the tongue piece is cut and raised toward the outer circumferential side over the inner circumferential convex portion of the spacer expander and the connecting member,
In addition, by providing pressure receiving surfaces integrally with the top and bottom of the tip of the tongue in the axial direction, the pressure receiving surface provided on the tip of the tongue can be provided between the pressure receiving surface and the pressure receiving surface provided on the conventionally existing outer convex portion. The pressure-receiving surface will be located.

Therefore, conventionally, the gap between the pressure receiving surfaces of the outer convex part was wide, and the surface pressure between the upper and lower surfaces of the piston ring groove was reduced, reducing the sealing performance. By providing the pressure-receiving surface provided at the tip of the tongue, which is a feature of the present application, between the pressure-receiving surfaces, the gap between the pressure-receiving surfaces can be shortened to half that of the conventional one.

Therefore, a uniform surface pressure is obtained over the entire circumference of the side rail, which ensures reliable sealing on the upper and lower surfaces of the piston ring groove, making it possible to reduce lubricant consumption.

At this time, it is preferable to provide the pressure receiving surface of the conventional outer convex portion and the pressure receiving surface of the tip of the tongue, which is a feature of the present application, on the same circumference in order to obtain a uniform surface pressure distribution. .

Further, by forming the tongue portion, a circumferential hole is formed in the inner convex portion and the connecting member, and the presence of the circumferential hole also has the following additional effects.

First, when there were no circumferential holes, the upper and lower protrusions were connected in the axial direction, so only the same tension could be transmitted to the two upper and lower side rails, but with the circumferential holes, The upper and lower protrusions are unique, and the most suitable tension can be transmitted to the upper and lower side rails, respectively, so the ability to follow the inner peripheral surface of the cylinder and the upper and lower parts of the piston ring is significantly improved.

Furthermore, this circumferential hole also functions as an oil chamber because the excess lubricating oil present on the inner peripheral surface of the cylinder is scraped off by the side rail and is returned to the oil pan via this circumferential hole. have

<Example> An example of the combination oil ring of the present invention will be described with reference to the accompanying drawings. In addition, as a conventional combination oil ring,
The same parts as those explained in Fig. 2.3 are given the same symbols.

FIG. 1 shows a perspective view of a spacer expander used in the combination oil ring of the present invention.

This spacer expander is made of an annular corrugated flat plate as a whole, and has an truncated annular shape with an abutment at one location. The corrugation comprises a series of outer protrusions 1 and a series of inner protrusions 2 alternating with each other, these protrusions 1.2 being connected by a radially extending connecting member 3.

A protrusion 21 is provided integrally with the upper and lower edges of the inner convex portion 2 in the axial direction, and a pressure receiving surface 11 is provided integrally with the upper and lower edges of the outer convex portion 1 in the axial direction.

Then, the tongue piece 7 is cut and raised toward the outer circumferential side over the inner protrusion 2 and the connecting member 3, leaving the upper and lower protrusions 21 in the axial direction of the inner protrusion 2. Pressure-receiving surfaces 71 are provided integrally with the top and bottom of the tongue tip 7 in the axial direction.

The tongue piece 7 is formed in a press process when manufacturing a spacer expander.

The axial width of the tongue piece 7 shown in FIG. 1 is wide at the pressure receiving surface 71, and is narrower at other parts. Although an example is shown in which the upper and lower lines are parallel, the portions other than the pressure receiving surface 71 may be gradually narrowed toward the inner circumference, as shown in FIG. At this time, the narrowest width B1 of the base 72 is 1/3 of the width B between the upper and lower pressure receiving surfaces.
It is desirable to leave 1/3 of the amount, as a strength problem will occur if it is not left.

Further, the positional relationship between the pressure receiving surface 71 of the tongue piece 7 and the pressure receiving surface 11 of the outer convex portion 1 should be such that they are located on the same circumference in order to apply uniform surface pressure to the side rail in the circumferential direction. is desirable.

Further, it is desirable that the pressure receiving surface 71 of the tongue piece 7 and the pressure receiving surface 11 of the outer convex portion 1 have the same area in order to apply a uniform surface pressure to the side rail in the circumferential direction.

FIG. 2 shows how the combination oil ring of the present invention is used. A pair of side rails 4 are assembled on both upper and lower end surfaces of a spacer expander having the above-mentioned configuration, and a piston ring groove 51 provided in a piston 5 is used. will be installed on the

Note that 6 indicates a cylinder. Since the number of pressure-receiving surfaces is twice that of the conventional one, uniform surface pressure can be applied to the upper and lower surfaces when the tension of the spacer expander is transmitted to the side rail 4 via the protrusion 21. Significantly improves bottom sealing performance. Furthermore, the circumferential hole 8 created by forming the tongue piece 7 allows the upper and lower projections 21, 21 to move independently, thereby improving the ability to follow the cylinder inner circumferential surface 61. Moreover, since this circumferential hole functions as an oil chamber, it can be used without a special oil chamber, but depending on the model, an oil chamber may be formed separately.

<Effects of the Invention> Since the combination oil ring of the present invention is configured as described above, the pressure receiving surface provided on the tongue piece is located between the pressure receiving surfaces provided on the conventionally existing outer convex portion and the pressure receiving surfaces. So,
The spacing between pressure-receiving surfaces is half of the conventional one. Therefore, the surface pressure on the upper and lower surfaces of the piston ring groove becomes uniform, and the sealing performance of the upper and lower surfaces is significantly improved, which has the effect of reducing lubricating oil consumption.

In addition, the upper and lower protrusions can move independently through the circumferential holes created by the tongues, which improves the ability of the side rail to follow the inner circumferential surface of the cylinder and improves the sealing performance on the outer circumferential surface of the side rail. has.

Furthermore, since the circumferential hole can function as an oil chamber, it has the effect of improving the flowability of the 1llIIW4 oil.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the spacer expander used in the combination oil ring of the present invention, and FIG.
2 is a cross-sectional view of essential parts showing a state in which the spacer expander shown in the figure is used in combination with a side rail, and corresponds to the AA cross section in FIG. 1. FIG. Fig. 3 is a front view showing another embodiment, Fig. 4 is a perspective view of a conventional spacer expander, and Fig. 5 is a sectional view of main parts when the spacer expander of Fig. 4 is used in combination with a side rail. It is. Explanation of symbols 1...Outer convex portion 11...Pressure receiving surface 2...Inner convex portion 21...Protrusion 3...Connecting member 4...Side rail

Claims (2)

[Claims] (1) Consisting of a corrugated flat plate having an annular shape as a whole, the corrugation is provided with a series of outer protrusions and a series of inner protrusions alternately, and these protrusions are connected by a connecting member extending in the radial direction. A spacer expander is provided with a projection integrally provided on the upper and lower axial edges of the inner convex portion, and a pressure receiving surface is provided integrally with the upper and lower axial edges of the outer convex portion. In a combination oil ring consisting of a pair of side rails disposed above and below a spacer expander, a tongue piece is cut and raised toward the outer circumferential side over the inner convex portion of the spacer expander and the connecting member, and A combination oil ring characterized by having a pressure-receiving surface integrally provided at the top and bottom of one end in the axial direction. (2) The spacer expander is characterized in that the pressure receiving surfaces provided above and below in the axial direction of the tip of the tongue and the pressure receiving surfaces on the upper and lower axial edges of the outer convex portion are located on the same circumference. A combination oil ring according to claim 1.