Piston ring
AssigneesMahle International GmbH, Mahle Metal Leve S/A
InventorsBruno Fineto, Rafael Antonio Bruno, Rafael Bettini Rabello, Marcelo Moura De Oliveira
Life of this patent
Estimating the term…
Abstract
A piston ring may include a spacer or expansion element and/or two segments. The segments may have a radial dimension between approximately 1.50 mm and approximately 1.90 mm and a height between approximately 0.30 mm and approximately 0.40 mm. The segments may have a concave profile with recesses between approximately 0.015 mm and approximately 0.030 mm and a clearance of approximately 0.150 mm. The segments may be wound via a matrix box device and a roller. The piston ring may have a circularity, expressed in the form of a decomposition as a Fourier series, with an amplitude for orders higher than 10 which is not greater than 0.10 μm.
Claims17
A piston ring, comprising:
- a spacer or expansion element;
- and
- two segments;
- wherein the spacer or expansion element is disposed between the two segments;
- wherein the segments have a radial dimension between approximately 1.50 mm and approximately 1.90 mm and a height between approximately 0.30 mm and approximately 0.40 mm;
- wherein the segments have a convex profile with (i) recesses each having a radial depth of between approximately 0.015 mm and approximately 0.030 mm at at least one location and (ii) a clearance of approximately 0.150 mm;
- wherein a first recess of the recesses is defined between a first axial point of the convex profile and a vertex of the convex profile, and a second recess of the recesses is defined between a second axial point of the convex profile and the vertex of the convex profile;
- wherein the radial depth of the first recess at the first axial point is 0.015 mm to 0.030 mm and the radial depth of the second recess at the second axial point is 0.015 mm to 0.030 mm;
- wherein the clearance is an axial distance between the first axial point and the second axial point;
- wherein the segments are wound via a matrix box device and a roller;
- and wherein the piston ring has a circularity, expressed in the form of a decomposition as a Fourier series, with an amplitude for orders higher than 10 which is not greater than 0.10 μm.
A piston ring, comprising:
- a spacer;
- and
- two segments each having (1) a radial dimension of 1.50 mm to 1.90 mm, (ii) an axial dimension of 0.30 mm to 0.40 mm, and (iii) a convex profile;
- wherein the spacer is disposed between the two segments;
- wherein the convex profile has (i) a first axial point, (ii) a second axial point, and (iii) a vertex disposed axially between the first axial point and the second axial point;
- wherein an axial distance between the first axial point and the second axial point is approximately 0.150 mm;
- wherein a radial distance between the vertex and one of the first axial point and the second axial point of the convex profile is 0.015 mm to 0.030 mm;
- and
- wherein the piston ring has a circularity, expressed in the form of a decomposition as a Fourier series, with an amplitude not greater than 0.10 μm for orders higher than 10.
Dependencies are inferred from the claim text.