JPH065105B2 - Combination oil ring - Google Patents

Description

TECHNICAL 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, the spacer expander and the spacer expanders arranged above and below the spacer expander are pressed in the outer peripheral direction to be pressed against the inner wall surface of the cylinder and also to the upper and lower surfaces of the ring groove of the piston. The present invention relates to an improvement of a combined oil ring including a side rail.

<Prior Art> In a reciprocating internal combustion engine, in order to prevent the lubricating oil on the inner wall surface of the cylinder from being efficiently scratched by the reciprocating motion of the piston and then being able to circulate it back to prevent it from going to the internal combustion chamber, The oil ring is installed in the ring groove. Such an oil ring is variously devised in order to improve its function as well as its material. As the oil ring most often used conventionally, for example, there is an oil ring disclosed in Japanese Patent Publication No. 33-10104. This oil ring is an oil ring as shown in FIGS. 4 and 5, and the spacer expander used for this oil rig is composed of a corrugated flat plate as a whole as shown in FIG. 4, and its waveform is a series of outer convex portions. 1 and inner convex portion 2
And the convex portions 1 and 2 are connected alternately by a connecting member 3 extending in the radial direction.

A protrusion 21 is provided on each of the upper and lower end surfaces of each inner convex portion, and a pressure receiving surface 11 is integrally formed 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 combined with the upper and lower end surfaces of this spacer expander as shown in FIG. 5, and are mounted in a piston ring groove 51 provided in the piston 5 for use.

This combined oil ring transmits the tension of the spacer expander to the side rail supported by the pressure receiving surface 11 via the projection 21 inclined toward the inner peripheral side, and the side rail is connected to the inner peripheral surface of the cylinder 6. The hot water is controlled by pressing 61 and the upper and lower surfaces 52, 53 of the piston rig groove to seal the hot water.

However, due to the recent effects of high output and high rotation,
There is a problem with the sealing performance on the upper and lower surfaces of the piston ring groove.

<Problems to be solved by the invention> As described above, in the conventional combined oil ring, the seals on the upper and lower surfaces of the piston ring groove are insufficient, and the lubricating oil cannot be sufficiently controlled, resulting in an increase in the amount of lubricating oil consumed. Was there.

The present invention focuses on this point and solves the conventional defects by improving the sealability on the upper and lower surfaces of the piston ring groove.

At the same time, it is intended to improve the followability of the side rail to the inner peripheral surface of the cylinder.

<Means for Solving the Problems> The present invention is composed of an annular corrugated flat plate as a whole in order to solve the above problems, and the corrugations alternately have a series of outer convex portions and a series of inner convex portions. Both of these convex portions are connected by a connecting member that extends in the radial direction, and projections are provided integrally on the upper and lower edges of the inner convex portion in the axial direction, and the upper and lower axial portions of the outer convex portion are A combination oil ring including a spacer expander having a pressure receiving surface integrally provided on the edge thereof and a pair of side rails arranged above and below the spacer expander is configured as follows.

That is, the tongue piece is cut and raised toward the outer peripheral side over the inner convex portion and the connecting member of the spacer expander, and the pressure receiving surface is provided integrally with the tip end portion of the tongue piece in the axial upper and lower directions. It was done.

More preferably, it is desirable that the pressure receiving surfaces provided above and below the tip end portion of the tongue piece in the axial direction and the pressure receiving surface at the axial edge of the outer convex portion are located on the same circumference.

<Operation> As described above, the tongue piece is cut and raised toward the outer peripheral side over the inner peripheral convex portion and the connecting member of the spacer expander,
Further, since the pressure receiving surfaces are provided integrally with the tongue tip upper and lower portions in the axial direction, the tongue tip is provided between the pressure receiving surface and the pressure receiving surface provided on the conventional outer convex portion. The pressure receiving surface is located.

Therefore, the gap between the pressure receiving surface and the pressure receiving surface of the outer convex portion is wide, and the surface pressure of the upper and lower surfaces of the piston ring groove during this period is reduced, which deteriorates the sealing performance. By providing the pressure receiving surface provided at the tip of the tongue piece, which is a feature of the present invention, between the pressure receiving surfaces, the gap between the pressure receiving surfaces can be reduced to half of the conventional one.

Therefore, a substantially uniform surface pressure can be obtained over the entire circumference of the side rails, so that the upper and lower surfaces of the piston ring groove can be reliably sealed and the consumption of lubricating oil can be reduced.

At this time, it is preferable that the pressure receiving surface of the outer convex portion and the pressure receiving surface of the tip of the tongue, which is a feature of the present invention, are provided 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, but the presence of this circumferential hole also has an additional effect as described below.

First, when there is no circumferential hole, since it is connected in the axial direction of the upper and lower protrusions, the same tension transmission could not be obtained for the two upper and lower side rails. , The upper and lower protrusions have uniqueness,
Since most suitable tensions can be transmitted to the upper and lower side rails, the followability with respect to the cylinder inner peripheral surface and the top and bottom of the piston rig is significantly improved.

Furthermore, this circumferential hole also acts as an oil window because it serves to return the oil scraped off by the side rails to the excess lubricating oil present on the inner circumferential surface of the cylinder to the oil pan through this circumferential hole. Have.

<Example> An example of the combined oil ring of the present invention will be described with reference to the accompanying drawings. As a conventional combination oil ring,
The same parts as those described in FIGS. 2 and 3 are designated by the same reference numerals.

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

The spacer expander as a whole is composed of an annular corrugated flat plate, and has a truncated annular shape having a single butting point. The corrugation alternately comprises a series of outer convex portions 1 and a series of inner convex portions 2, and these both convex portions 1 and 2 are connected by a connecting member 3 extending in the radial direction.

Protrusions 21 are integrally provided on the upper and lower edges of the inner convex portion 2 in the axial direction, and pressure receiving surfaces 11 are integrally provided on 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 peripheral side across the inner convex portion 2 and the connecting member 3, leaving the projections 21 on the upper and lower sides in the axial direction of the inner convex portion 2. Pressure receiving surfaces 71 are provided above and below the tongue piece tip end portion 7 in the axial direction integrally therewith.

The tongue piece 7 is formed by a press working process when manufacturing the spacer expander.

The width of the tongue piece 7 shown in FIG. 1 in the axial direction is wide at the pressure receiving surface 71, and is narrower at other portions. Although the upper and lower lines are parallel to each other, 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 width B1 of the base portion 72 that becomes the smallest becomes 1/3 of the width B between the upper and lower pressure receiving surfaces.
It is desirable to leave ⅓ because there is a problem in strength if it is not left.

Further, the pressure receiving surface 71 of the tongue piece 7 and the pressure receiving surface 11 of the outer convex portion 1 may be arranged so as to be located on the same circumference in order to apply a uniform surface pressure to the side rails in the circumferential direction. desirable.

Furthermore, 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 rails in the circumferential direction.

The usage state of the combined oil ring of the present invention is shown in FIG. 2. A pair of side rails 4 are combined with the upper and lower end surfaces of the spacer expander having the above-described structure, and a piston ring groove 51 provided in the piston 5 is provided. Be attached to.
In addition, 6 shows a cylinder. In this way, the number of pressure receiving surfaces is twice that of the conventional pressure receiving surface. Therefore, when the tension of the spacer expander is transmitted to the side rails 4 via the protrusions 21, uniform surface pressure can be applied to the upper and lower surfaces. The bottom surface sealing property is significantly improved. Further, since the vertical projections 21 and 21 can independently move due to the circumferential hole 8 formed by forming the tongue piece 7, the followability to the cylinder inner peripheral surface 61 is improved. Moreover, since this circumferential hole functions as an oil window, it can be used without specially opening the oil window. However, depending on the model, another oil window may be formed.

<Effects of the Invention> Since the combined oil ring of the present invention is configured as described above, the pressure receiving surface provided on the tongue is positioned between the pressure receiving surface provided on the conventionally existing outer convex portion and the pressure receiving surface. So
The distance between the pressure receiving surfaces is half that of the conventional one. Therefore, the surface pressure on the upper and lower surfaces of the piston ring groove becomes uniform, the sealing performance on the upper and lower surfaces is significantly improved, and the consumption of lubricating oil can be reduced.

Also, since the upper and lower protrusions can move independently due to the circumferential hole formed by this tongue, the followability of the side rail to the cylinder inner peripheral surface is improved and the sealing performance on the side rail outer peripheral surface is also improved. Have.

Further, since the circumferential holes can function as an oil window, the circulation of lubricating oil can be improved.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a spacer expander used in the combined oil ring of the present invention, and FIG.
FIG. 2 is a cross-sectional view of a main part showing a state in which a side rail is used in combination with the spacer expander in the figure, and corresponds to the AA cross section in FIG. 1. FIG. 3 is a front view showing another embodiment, and FIG. 4 is a perspective view of a conventional spacer expander,
FIG. 5 is a sectional view of an essential part when a side rail is used in combination with the spacer expander of FIG. DESCRIPTION OF SYMBOLS 1 ... Outer convex portion 11 ... Pressure receiving surface 2 ... Inner convex portion 21 ... Protrusion 3 ... Connecting member 4 ... Side rail 5 ... Piston 51 ... Piston ring groove 6 ... Cylinder 61 ... Cylinder inner peripheral surface 7 ... Tongue piece 71 ... Pressure receiving surface 8 ... Circumferential hole 72 ... Tongue base

Claims (2)

[Claims] 1. A corrugated flat plate as a whole, the corrugations alternately comprising a series of outer convex portions and a series of inner convex portions, both convex portions being connected by a radially extending connecting member. A spacer expander in which projections are provided integrally on the upper and lower edges of the inner protrusion in the axial direction, and pressure receiving surfaces are integrally formed on the upper and lower edges of the outer protrusion in the axial direction. And a pair of side rails arranged above and below the spacer expander, wherein the tongue piece extends to the outer peripheral side across the inner convex portion and the connecting member at all the inner peripheral convex portions of the spacer expander. A combined oil ring, which is cut and raised toward the top, and is provided with a pressure receiving surface integrally with the tip end of the tongue in the axial upper and lower directions. 2. In the spacer expander, the pressure receiving surfaces provided at the axially upper and lower ends of the tongue piece and the axially upper and lower edges of the outer convex portion are located on the same circumference. The combined oil ring according to claim 1, which is characterized.