JP2594891Y2 - Steel combination oil control ring - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil control ring used for an internal combustion engine, and more particularly to a steel combination oil control ring capable of reducing abrasion of ears of a spacer expander for pressing the oil control ring radially outward. I do.

[0002]

2. Description of the Related Art As shown in FIGS. 4 and 5, a conventional steel combination oil control ring comprises two upper and lower spring steel side rails 1 and a stainless steel spacer expander sandwiched between the side rails 1. 2 and 3 steel pieces. The spacer expander 2 has a U-shaped waveform, and ears 3 formed at substantially equal intervals in the peaks and valleys support the inner peripheral surface 1 a of the side rail 1. An elastic force that presses the cylinder in the radial direction is applied. In addition, the spacer expander 2 pushes the side rail 1 in the vertical direction of the ring groove, that is, in the axial direction, by the inclination angle θ formed outside the ear portion 3.
Keep the side of the ring groove confidential. In particular, it is effective in preventing oil rising due to high boost during engine braking.

The other type of steel combined oil control ring shown in FIG. 6 has a small projection 4 formed on the surface of the spacer 2 which abuts on the rail 1. Recently, the height (total length) of the piston has been shortened, and an oil control ring has been required which can follow a severe swing motion of the piston. With the increase in the speed of the swing motion of the piston and the increase in the swing angle, it has become necessary to further improve the ability of the piston ring to follow the cylinder wall. The oil control ring shown in FIG. 6 is characterized in that the small projections 4 are formed in response to this requirement so that the surface pressure on the ring groove is uniformly increased over the entire circumference. Also, the swinging motion of the piston,
A stable oil control action occurs in response to cylinder wear and deformation. Furthermore, since sufficient confidentiality of the side of the ring groove is maintained, pumping action is prevented,
It has the effect of reducing oil consumption.

FIG. 4 shows an example in which the spacer expander 2 has a waveform shape in the vertical direction, while FIG. 7 shows an example in which the spacer expander 2 has a waveform shape in the horizontal direction. An opening 5 serving as an oil passage is formed in the spacer expander 2.

[0005] Side rail 1 and spacer expander 2
It is generally assumed that there is no relative movement (relative rotation) between
The relative circumferential movement between the side rail 1 and the spacer expander 2 due to the vibration of the piston, the cylinder, the piston ring, etc. due to the weight reduction, and the inherent change in the amplitude,
That is, irregular rotation has occurred.

[0006] Side rail 1 and spacer expander 2
Irregular rotation between the two causes the following malfunction of the combined oil ring and lowers the oil control function.

(A) The relative rotational movement of the side rail 1 and the spacer expander 2 causes the inner peripheral surface of the side rail 1 and the ear 3 of the spacer expander 2 which are the high pressure contact parts to be rapidly worn and combined. Reduce the tension and surface pressure of the oil control ring.

(B) The preferable relative positional relationship between the side rail 1 and the spacer expander 2 is broken, and the abutment of the upper and lower side rails 1 and the abutment of the spacer expander 2 coincide with each other in the axial direction. This causes an increase in the amount of leakage, a decrease in oil scraping performance, and damage to the abutment of the spacer expander 2.

(C) The rotation of the side rail 1 causes the abutment to cut the side surface of the ring groove (especially in the case of an aluminum alloy piston), increase the amount of wear, and lower the side rail function.

[0010] Side rail 1 and spacer expander 2
In order to solve the above-mentioned problem caused by the relative rotational movement of the side rails, there have been proposed some means for preventing the relative rotation between the side rail 1 and the spacer expander 2.

Japanese Utility Model Laid-Open Publication No. 54-16147 discloses that at least one concave portion is formed on the inner peripheral side of a side rail, and when a piston having a combined oil control ring is disposed in a cylinder bore, a lug portion of a spacer expander is formed. The radially outwardly acting elastic force protrudes the radially outwardly facing ear against the concave portion of the side rail that does not directly contact the inner peripheral surface of the side rail, and engages the concave portion with this ear. The configuration to make it possible is shown.

Further, separately from the means for forming the concave portion,
Japanese Utility Model Laid-Open No. 1-77869 and Japanese Utility Model Laid-Open No. 3-67759.
As disclosed in Japanese Unexamined Patent Publication, it has been proposed to provide fine irregularities, that is, notches on the inner peripheral surface of the side rail.

[0013]

In the conventional oil control ring, the effective contact area between the inner peripheral surface of the side rail and the ear portion of the spacer expander is reduced, so that the contact is further increased under the use condition of high contact surface pressure. The surface pressure increases, and the inner peripheral surface of the side rail is worn faster, so that the inner rail is worn earlier to the notch depth.

[0014] Accordingly, an object of the present invention is to provide a combined oil control ring that can prevent relative rotation of the side rail with respect to the spacer expander.

[0015]

The steel combined oil control ring according to the present invention comprises a side rail (1) made of steel and an ear (3) for abutting the side rail (1) on the inner periphery. And a stainless steel spacer expander (2) formed at substantially equal intervals. The side rail (1) is pressed radially outward via the ear (3) by the elasticity of the spacer expander (2).
In this combined steel oil control ring, a recess (7) is formed at the center in the circumferential direction of the lug (3), and projections (6) are formed on both sides of the recess (7) in the circumferential direction. The inner peripheral surface (1a) of the rail (1) is brought into contact with the projection (6) of the ear (3). The concave portion (7) is H = 0.006 to 0.0 with respect to a straight line connecting the vertices of the protrusion (6).
It is formed in an arc shape having a radius of 0.010 to 0.700 mm at a depth of 60 mm.

[0016]

A concave portion (7) is formed in an arc shape having a radius of 0.010 to 0.700 mm at a depth of H = 0.006 to 0.060 mm at the center on the outer peripheral surface of the ear portion (3). When formed, the inner peripheral surface (1a) of the side rail (1) does not come into contact with the concave portion (7), and only two points of the protrusions (6) provided on both sides of the concave portion (7) are side contacted by a large contact pressure. It comes into contact with the inner peripheral surface (1a) of the rail (1). For this reason, contact of the inner peripheral surface (1a) of the side rail (1) with the concave portion (7) of the ear portion (3) can be avoided, so that the side rail (1) with respect to the spacer expander (2) during operation of the internal combustion engine. Relative rotation can be reliably prevented.
With a radius of 0.010 to 0.700 mm, the concave portion (7) can be easily formed in an arc shape in the ear portion (3), and the strength of the ear portion (3) does not decrease.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a steel combined oil control ring according to the present invention will be described below with reference to FIGS. In these drawings, the same portions as those shown in FIGS. 4 to 7 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 1 is a partially enlarged perspective view of the ear 3 shown in FIG. As shown in FIG. 1, the combined oil control ring made of steel according to the present invention includes a spacer expander 2.
A pair of protrusions 6 are formed on the outer side of the ear part 3 and on both ends in the circumferential direction of the ear part 3, respectively, as shown in FIG.
The concave portion 7 is formed by the R portion at the center in the circumferential direction. The protrusions 6 are formed integrally with and simultaneously with the spacer when the spacer expander 2 is press-molded. The depth H in the radial direction of the recess 7 is H with respect to a straight line connecting the vertices of the protrusion 6.
= 0.006 to 0.060 millimeters. The tip of the projection 6 of the ear 3 is in contact with the inner peripheral surface 1 a of the side rail 1. The radius of the R portion forming the concave portion 7 is 0.010 to 0.70.
0 millimeters, preferably 0.054 to 0.540 millimeters. In this embodiment, H = 0.006 to 0.00.
When the concave portion 7 is formed at the center on the outer peripheral surface of the ear portion 3 in an arc shape having a depth of 060 mm and a radius of 0.010 to 0.700 mm, the inner peripheral surface 1 of the side rail 1 is formed.
a does not come into contact with the recess 7, and only two points of the protrusions 6 provided on both sides of the recess 7 come into contact with the inner peripheral surface 1 a of the side rail 1 with a large contact pressure. For this reason, contact of the inner peripheral surface 1a of the side rail 1 with the concave portion 7 of the ear 3 can be avoided, so that relative rotation of the side rail 1 with respect to the spacer expander 2 during operation of the internal combustion engine can be reliably prevented. . If the depth H of the concave portion 7 is 0.006 mm or less, the inner peripheral surface 1a of the arc-shaped side rail 1 does not contact only two points at both ends of the ear portion 3, and the depth H is 0.060. If it is more than millimeter, manufacturing becomes difficult. 0.01
With a radius of 0 to 0.700 mm, the concave portion (7) can be easily formed in an arc shape in the ear portion (3), and the strength of the ear portion (3) does not decrease.

The present inventor has made a number of oil control rings and a number of conventional oil control rings according to the present invention in which the projections 6 are provided on the spacer expander 2 so that the swing of the piston is large and the side rail can rotate independently. Each of the six types of engines including the L4 type engine and the V6 type engine, which are likely to be generated, was mounted on five engines, and a side rail rotation test was performed. As a result, in the conventional oil control ring, the side rails independently rotated with respect to the spacer expander of 22%, but in the oil control ring according to the present invention, there was no spacer expander in which the side rails independently rotated.

The embodiment of the present invention is not limited to the above-described embodiment, but can be modified. For example, the outside of the ear part 3 may be a simple plane, but as shown in FIG. 5 or FIG. 6, an inclined surface is formed together with the projection 6 on the outside of the ear part 3 of the spacer expander 2, and The side rail 1 may be pressed in the axial direction.

[0021]

As described above, according to the present invention, the independent rotation of the side rails during operation of the engine can be prevented, so that the wear of the side rails and the spacer expander can be suppressed, and the life of the engine can be extended. . Since the ear projections are processed at the same time when the spacer expander is press-molded, no additional processing is required, and the molding of the raw material does not take place excessively.

[Brief description of the drawings]

FIG. 1 is a partially enlarged perspective view of a lug of a steel combination oil control ring according to the present invention.

FIG. 2 is a plan view of an ear part.

FIG. 3 is a perspective view of an ear showing another embodiment.

FIG. 4 is a sectional view of a conventional steel combination oil control ring.

FIG. 5 is a sectional view taken along the line AA in FIG. 4;

FIG. 6 is a sectional view of another conventional steel combination oil control ring.

FIG. 7 is a cross-sectional view of another conventional steel combination oil control ring.

[Explanation of symbols]

1. Side rail, 1a Inner peripheral surface, 2. Spacer expander, 3. Ear part, 6. Projection,
7. . Recess,

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 2-41763 (JP, U) JP-A 1-78768 (JP, U) JP-A 60-14261 (JP, U) JP-A 1-76 158545 (JP, U) Jikken 63-11 312 (JP, Y2) Jikgyo 5-5327 (JP, Y2) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16J 9/00-9 / 28

Claims (1)

(57) [Scope of request for utility model registration] 1. A stainless steel side expander comprising: a side rail formed of steel; and a stainless steel spacer expander having ears abutting on the side rail formed at substantially equal intervals on an inner peripheral portion thereof.
The side rail is a steel combined oil control ring that is pressed radially outward through the ear by the elasticity of the spacer expander. A protrusion is formed on each side, and the inner peripheral surface of the side rail is brought into contact with the protrusion of the ear, and the concave portion is H = 0.006 with respect to a straight line connecting the vertices of the protrusion.
0.010-0.7 at a depth of ~ 0.060 mm
A steel combined oil control ring formed in an arc shape having a radius of 00 millimeters.