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Combined oil control ring

An oil control ring and side rail technology, applied in piston rings, machines/engines, mechanical equipment, etc., can solve the problems of insufficient experimental evidence, no consideration of other parameters, different requirements, etc., to achieve stable stability, prevent sticking, The effect of reducing oil consumption

Inactive Publication Date: 2018-11-09
RIKEN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, as described above, the ratio 2X / Y is set at 0.04 to 0.15 in Patent Document 6, and is set at 0.13 to 0.25 in Patent Document 7, and the respective required ranges are different, and experimental evidence is insufficient.
In addition, in Patent Document 6 and Patent Document 7, the influence of other parameters is not considered

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 11

[0076] Example 11 (E11)

[0077] A combined oil ring was manufactured in the same manner as in Example 1, except that the intermediate portion was formed as a spacer in which the intermediate portion was inclined substantially in the circumferential direction as shown in FIG. 3( a ) and FIG. 3( b ). The protrusion width A1 at one end in the circumferential direction of the protrusion part was formed to be 0.12 mm, and the protrusion width A2 at the other end was formed to be 0.15 mm. Thus, S min Same as Example 1.

Embodiment 12

[0078] Example 12 (E12)

[0079] A combined oil ring was produced in the same manner as in Example 1, except that the intermediate portion was formed as a spacer expander having a convex shape in the substantially circumferential direction as shown in FIGS. 4( a ) and 4 ( b ). The protrusion width A3 at the center of the circumferential direction of the protrusion was formed to be 0.12 mm, and the protrusion width A4 at both ends in the circumferential direction was formed to be 0.15 mm. Thus, S min Same as Example 1.

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PUM

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Abstract

The present invention provides a combined oil control ring for vehicle engines, wherein even in a long-term engine operation, sticking between a spacer expander and a side rail does not occur, and anexcellent oil control function can be maintained. To this end, the combined oil control ring is composed of: an ear part in which each of a crest part and a trough part of the spacer expander pressesthe inner circumferential surface of the side rail; a protruding part for supporting the side rail; and a middle part between the ear part and the protruding part, wherein the ratio Smin / S0 is set to1.9% or more where Smin is the minimum axial cross-sectional area of the middle part formed between the middle part and the side surface of the side rail facing the middle part and S0 is the axial cross-sectional area from the bottom of an oil groove of a piston, in which the combined oil control ring is installed, to an inner wall of a cylinder liner.

Description

technical field [0001] The present invention relates to a combined oil control ring mounted on a piston of an automobile engine, and more particularly to a combined oil control ring composed of a pair of side rails and a spacer expander formed with peaks and valleys in the axial wave form. Background technique [0002] As the most important issue for modern society, we actively promote measures related to the reduction of global environmental load. Among them, carbon dioxide (CO 2 ) reduction of emissions, conservation of oil resources, etc. are being emphasized, especially in automobile engines, the reduction of fuel consumption due to downsizing and weight reduction and reduction of various losses is more strongly demanded. On the other hand, the requirement for purification of exhaust gas is also higher, and the reduction of harmful substances contained in exhaust gas and thus the reduction of lubricating oil consumption has become a major issue. [0003] In an automobi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J9/06F02F5/00
CPCF02F5/00F16J9/068
Inventor 望月和矢
Owner RIKEN CO LTD