Piston ring for an internal combustion engine

Patent metadata

Field	Value
Publication number	US-10125869-B2
Application number	US-201313768196-A
Country	US
Kind code	B2
Filing date	Feb 15, 2013
Priority date	Feb 17, 2012
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A power cylinder assembly for an internal combustion engine is provided. The power cylinder assembly includes a cylinder wall having a channel formed therein and a piston body with a skirt. A piston ring is seated within the channel of the cylinder wall and is sealed against the skirt of the piston body. Specifically, the piston ring has a ring body with an inner face that presents two radially inwardly extending ridges spaced axially from one another by a valley region, and the outer face presents a groove which receives a spring to bias the ridges into sliding engagement with the outer surface of the skirt of the piston body. The ring body also has at least one oil drainage port which extends radially between the valley region of the inner surface and the groove of the outer face for conveying oil from between the ridges into the groove.

First claim

What is claimed is:

1. A power cylinder assembly, comprising:
a cylinder wall having a channel formed therein, said channel extending substantially circumferentially around said cylinder wall, and said channel having a circumferentially constant and U-shaped cross-sectional shape which opens inwardly in a radial direction and is free of other openings;
a piston body having a skirt and wherein at least a portion of an outer surface of said skirt extends continuously around a circumference;
a piston ring disposed in said channel of said cylinder wall;
said piston ring having a ring body that is made of a monolithic piece of metal and that extends about an axis and has an inner face and an outer face, said inner face having only ridges that extend in the radial direction, said ridges being spaced from one another by a valley region, said outer face presenting a groove, and said ring body having a planar top surface and a planar bottom surface along a full distance between opposite gap faces that are separated from one another by a ring gap;
said piston ring further including a spring substantially circumferentially surrounding said ring body and seated in said groove on said outer face, said spring biasing said ring body inwardly in radial direction to seal said ridges against said circumferentially continuous portion of said skirt of said piston body, and said spring being a coil spring;
said ring body having at least one oil drainage port extending in the radial direction between said valley region of said inner face and said groove of said outer face for conveying oil from between said ridges to said groove;
wherein said ridges of said ring body have respective first surfaces that face away from said valley region, each first surface extending at a first angle relative to the radial direction; and
wherein said inner face of said ring body further includes second surfaces, wherein each second surface extends from one of said first surfaces to a respective one of said planar top and bottom surfaces, and wherein each second surface is angled relative to the radial direction at a second angle that is greater than zero degrees and is greater than said first angle and wherein said second angle is approximately eighty degrees.

2. The power cylinder assembly as set forth in claim 1 wherein said at least one oil drainage port in said ring body is further defined as a plurality of oil drainage ports spaced circumferentially from one another.

3. The power cylinder assembly as set forth in claim 1 wherein said ring body is uncoated.

4. The power cylinder assembly as set forth in claim 1 wherein said ring body is of cast iron or steel.

Assignees

• Federal Mogul Corp
• Tenneco Inc

Inventors

• Jenness Blair Matthew
• Pedigo Matthew Ryan
• Kantola Troy

Classifications

• F02F1/18

  Other cylinders · CPC title

• F16J9/206

  One-piece oil-scraping rings · CPC title

• F16J9/062 Primary

  Coiled spring along the entire circumference · CPC title

• F16J9/06

  using separate springs {or elastic elements} expanding the rings; Springs therefor {; Expansion by wedging} · CPC title