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US 11,994,219 B2Granted
Side rail and oil control ring comprising same
OwnerHiroyuki Yabune, Yoshiyuki Hirade +1inventors
InventorsHiroyuki Yabune, Yoshiyuki Hirade, Kentaro Miyagawa
Life of this patent
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Abstract
A side rail forms an oil control ring together with a spacer expander, and includes: an outer peripheral surface; an inner peripheral surface having a vertically symmetrical shape in an axial cross section; a first side surface; and a second side surface. The inner peripheral surface includes an inner tip portion satisfying following Condition 1 in an axial cross section. 0.7≤R1/h0≤1.1 Condition 1: In the expression, R1 represents a curvature radius (unit: mm) of a curve forming the inner tip portion, and h0 represents a height (unit: mm) of the side rail.
Claims13
An oil control ring comprising:
- a pair of side rails including a first side rail and a second side rail;
- and
- a spacer expander disposed between the pair of side rails,
- wherein each of the first side rail and the second side rail comprises:
- a first side surface extending in a radial direction of a side rail;
- a second side surface extending in the radial direction opposite the first side surface, wherein a height of the side rail is taken from the first side surface to the second side surface in an axial direction of the side rail;
- an outer peripheral surface;
- an inner peripheral surface having a vertically symmetrical shape with respect to a center line in an axial cross section of the side rail;
- a first inclined surface between the outer peripheral surface and the first side surface;
- and
- a second inclined surface between the outer peripheral surface and the second side surface,
- wherein the spacer expander comprises a plurality of ear portions, and a plurality of rail facing portions provided adjacent to the ear portions and facing the first side surface of the first side rail and a second side surface of the second side rail,
- wherein the inner peripheral surface of the first side rail and an inner peripheral surface of the second side rail abut against the plurality of ear portions,
- wherein the inner peripheral surface forms a continuous surface that comprises a curved inner tip portion intersecting the center line, and a curved peripheral edge portion extending between the inner tip portion and the first side surface,
- wherein, in the axial cross section, the inner tip portion satisfies 0.7≤R1/h0≤1.1, wherein R1 represents a curvature radius of a curve forming the inner tip portion, and h0 represents the height of the side rail,
- wherein in the axial cross section, the peripheral edge portion has a curvature radius that is less than the curvature radius of the inner tip portion,
- wherein the peripheral edge portion is a first peripheral edge portion of the inner peripheral surface, that is curved convexly,
- wherein the inner peripheral surface comprises a second peripheral edge portion that is curved convexly and extends between the inner tip portion and the second side surface in the axial cross section,
- wherein, in the axial cross section, the first peripheral edge portion and the second peripheral edge portion satisfy 0.2≤R2/h0≤0.5, wherein R2 represents a curvature radius of curves forming the first peripheral edge portion and the second peripheral edge portion,
- wherein the outer peripheral surface comprises an outer tip portion satisfying 0.1≤R0/h0≤0.23, wherein R0 represents a curvature radius of a curve forming the outer tip portion,
- wherein in the axial cross section, a distance is taken in the radial direction from a tip of the outer peripheral surface to a boundary between the first side surface and the first inclined surface, and a thickness of the side rail is taken in the radial direction from the tip of the outer peripheral surface to a tip of the inner peripheral surface, and
- wherein the first inclined surface is set to satisfy 0.1≤a/T≤0.2, wherein a represents the distance in the radial direction, and T represents the thickness of the side rail.
19 more elements
An oil control ring comprising:
- a spacer expander extending substantially in a ring-shape;
- and
- a pair of side rails including a first side rail and a second side rail, and extending in a circumferential direction along the spacer expander,
- wherein each of the first side rail and the second side rail comprises:
- a first side surface extending substantially in a radial direction of the spacer expander;
- a second side surface extending substantially in the radial direction, wherein the second side surface is located opposite the first side surface in an axial direction of the spacer expander and a height of the side rail is taken from the first side surface to the second side surface in an axial direction of the side rail;
- an inner peripheral surface contacting the spacer expander, wherein the inner peripheral surface forms a continuous surface from the first side surface to the second side surface, that includes a curved inner tip portion forming an innermost tip in the radial direction, and a curved inner edge portion extending between the inner tip portion and the first side surface, and wherein, in an axial cross-section of the side rail, the inner tip portion has a curvature radius that is different from a curvature radius of the inner edge portion;
- an outer peripheral surface located opposite the inner peripheral surface in the radial direction, wherein the outer peripheral surface includes a curved outer tip portion that forms an outermost tip of the side rail in the radial direction, and wherein in the axial cross-section of the side rail, the outer tip portion has a curvature radius that is less than the curvature radius of the inner tip portion;
- a first inclined surface between the outer peripheral surface and the first side surface;
- and
- a second inclined surface between the outer peripheral surface and the second side surface,
- wherein the spacer expander comprises a plurality of ear portions, and a plurality of rail facing portions provided adjacent to the ear portions and facing the first side surface of the first side rail and a second side surface of the second side rail,
- wherein the inner peripheral surface of the first side rail and an inner peripheral surface of the second side rail abut against the plurality of ear portions,
- wherein the inner peripheral surface forms a continuous surface that comprises a curved inner tip portion intersecting the center line, and a curved peripheral edge portion extending between the inner tip portion and the first side surface,
- wherein, in the axial cross section, the inner tip portion satisfies 0.7≤R1/h0≤1.1, wherein R1 represents a curvature radius of a curve forming the inner tip portion, and h0 represents the height of the side rail,
- wherein in the axial cross section, the peripheral edge portion has a curvature radius that is less than the curvature radius of the inner tip portion,
- wherein the peripheral edge portion is a first peripheral edge portion of the inner peripheral surface, that is curved convexly,
- wherein the inner peripheral surface comprises a second peripheral edge portion that is curved convexly and extends between the inner tip portion and the second side surface in the axial cross section,
- wherein, in the axial cross section, the first peripheral edge portion and the second peripheral edge portion satisfy 0.2≤R2/h0≤0.5, wherein R2 represents a curvature radius of curves forming the first peripheral edge portion and the second peripheral edge portion,
- wherein the outer peripheral surface comprises an outer tip portion satisfying 0.1≤R0/h0≤0.23, wherein R0 represents a curvature radius of a curve forming the outer tip portion,
- wherein in the axial cross section, a distance is taken in the radial direction from a tip of the outer peripheral surface to a boundary between the first side surface and the first inclined surface, and a thickness of the side rail is taken in the radial direction from the tip of the outer peripheral surface to a tip of the inner peripheral surface, and
- wherein the first inclined surface is set to satisfy 0.1≤a/T≤0.2, wherein a represents the distance in the radial direction, and T represents the thickness of the side rail.
19 more elements
Dependencies are inferred from the claim text.