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Oil ring

a technology of oil rings and rings, applied in the field of oil rings, can solve the problems affecting the oil control function and the pressure of the oil ring on the cylinder wall surface cannot be reduced beyond a certain limit, so as to achieve the effect of reducing the friction resistan

Inactive Publication Date: 2017-06-29
HONDA MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The technical effect of this patent is to provide an oil ring that can reduce frictional resistance without compromising the function of controlling the oil film thickness. This is achieved by designing the outer peripheral surface of the oil ring with a first slant angle and a second slant angle, which causes the oil ring to tilt during the upward and downward strokes of the piston, resulting in a reduction of lubricating oil film thickness and an improvement in fuel efficiency. Additionally, the oil ring is designed to engage the cylinder wall surface with an optimum slant angle.

Problems solved by technology

The frictional resistance may be reduced by decreasing the pressure exerted on the cylinder wall surface by the oil ring, but it may impair the oil control function of the oil ring such as the scraping of the lubricating oil off the cylinder wall surface.
Therefore, the pressure of the oil ring on the cylinder wall surface cannot be reduced beyond a certain limit.

Method used

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Embodiment Construction

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[0023]An oil ring embodying the present invention is described in the following with reference to FIG. 1.

[0024]As shown in FIG. 1, a cylinder block 2 of an internal combustion engine 1 is provided with a cylinder 3 having a circular cross section and extending along a prescribed axial line (which is assumed to be extending vertically for the convenience of description), and a piston 4 is slidably received in the cylinder 3. A combustion chamber is defined by an upper part of the cylinder 3, the top surface of the piston 4 and a cylinder head not shown in the drawing. The outer peripheral part of the piston 4 is formed with a first ring groove 6, a second ring groove 7 and a third ring groove 8, in that order from the top. Each of these ring grooves is annular in shape. The first ring groove 6 and the second ring groove 7 receive a first pressure ring 11 and a second pressure ring 12, respectively, and the third ring groove 8 receives an oil ring 13.

[0025]The third ring groove 8 inc...

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Abstract

Provided is an oil ring (13) that can minimize the frictional resistance without impairing the oil control function such as the scraping of lubricating oil from the cylinder wall surface by the oil ring. The oil ring consists of an upper side rail (16), a lower side rail (17) and an annular expander (18) interposed between the two side rails, and is received in an oil ring groove (8) with a prescribed vertical clearance (20) that permits tilting of the side rails. An outer peripheral surface (16E, 17E) of each side rail is provided with a radially inward slant. Therefore, during the upward stroke of the piston, the upper side rail tilts in the radially outward direction so that the effective slant angle of the outer peripheral surface of the upper side ring is adjusted to an optimum value.

Description

TECHNICAL FIELD[0001]The present invention relates to an oil ring for a piston of a reciprocating machine such as an internal combustion engine, and in particular to a composite oil ring including a pair of side rails and an expander interposed between the two side rails.BACKGROUND ART[0002]The oil ring used in the pistons of conventional reciprocating internal combustions typically consists of a three piece oil ring including a pair of annular side rails positioned one above the other and a space expander interposed between the two side rails. See JP2003-194222A, for instance.[0003]In recent years, there has been an increasing desire to reduce the frictional resistance between the oil ring and the associated cylinder wall surface in view of improving fuel economy. The frictional resistance may be reduced by decreasing the pressure exerted on the cylinder wall surface by the oil ring, but it may impair the oil control function of the oil ring such as the scraping of the lubricating ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F16J9/20
CPCF16J9/206F16J9/066F16J9/203
Inventor KAWASE, NAOKAZUNAKAGAWA, HAJIME
Owner HONDA MOTOR CO LTD
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