Combined oil ring

Patent metadata

Field	Value
Publication number	US-10520085-B2
Application number	US-201615560579-A
Country	US
Kind code	B2
Filing date	Mar 31, 2016
Priority date	Mar 31, 2015
Publication date	Dec 31, 2019
Grant date	Dec 31, 2019

Abstract

A combined oil ring in which carbon sludge and the like are not deposited between side rails and a spacer expander even if an internal combustion engine is operated for a long period of time. The combined oil ring includes an outer circumferential end portion of a space forming part and a continuous part that are closed and not open toward the outer circumferential side, thereby reducing carbon sludge deposits.

First claim

The invention claimed is:

1. A combined oil ring to be fitted in an oil ring groove of a piston, comprising:
a pair of upper and lower flat plate-like circular side rails; and
a spacer expander arranged between the pair of upper and lower side rails,
the spacer expander including:
a large number of upper pieces and lower pieces that are alternately arranged in a circumferential direction so as to be spaced apart in an axial direction and the circumferential direction;
coupling pieces that respectively couple the adjacent upper pieces and lower pieces; and
ear parts that are each formed so as to erect in an inner circumferential end portion of each of the upper pieces and the lower pieces, and serve to push the side rails, wherein:

a side rail support part that abuts on the side rail is provided in an outer circumferential end portion of at least one of an upper surface of each upper piece and a lower surface of each lower piece;
a space forming part spaced apart from the side rail support part in the axial direction is provided in any one of the upper surface of the upper piece and the lower surface of the lower piece, such that a space is formed between the side rail and any one of the upper surface of the upper piece and the lower surface of the lower piece;
the space forming part and the side rail support part are continuous in the radial direction through a continuous part;
a groove that is communicated with a through-hole in the ear part is formed in the space forming part along the radial direction;
an outer circumferential end portion of the space forming part and the continuous part are not open toward the outer circumferential side and are closed, and
the continuous part has a step including a radially extending portion and an axially extending portion, the axially extending portion extending substantially parallel to any one of the side rail support part and the space forming part.

2. The combined oil ring according to claim 1 , wherein
the groove is formed into a substantial V shape protruding upward or downward in the axial direction.

3. The combined oil ring according to claim 1 , wherein
the ear part has a trapezoidal shape when observed from an outer diameter direction.

4. The combined oil ring according to claim 1 , wherein
a shape of the through-hole when observed from an outer diameter direction is substantially similar to an outer shape of the ear part.

5. The combined oil ring according to claim 1 , wherein
a length along the axial direction from an upper surface or a lower surface of the side rail support part to the continuous part is set smaller than a plate thickness of the spacer expander.

6. The combined oil ring according to claim 1 , wherein
a length of the continuous part in the radial direction is set to be equal to or less than 0.2 mm.

7. The combined oil ring according to claim 1 , wherein
a depth of the groove is set to be equal to or more than 0.10 mm.

Assignees

• Nippon Piston Ring Co Ltd

Inventors

• Murata Yasuyuki
• Arai Kenji
• Kamata Ryosuke
• Hitosugi Hideshi
• Takahashi Kazumoto
• Tsukui Toru

Classifications

• F16J9/066 Primary

  Spring expander from sheet metal · CPC title

• F16J9/068 Primary

  corrugated in the axial direction · CPC title