Cylinder liner and internal combustion engine
AssigneeKS Kolbenschmidt GmbH
InventorWolfgang Hanke
Life of this patent
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Abstract
A cylinder liner (8) for an internal combustion engine (7), comprising a middle axis (9), and an inner surface (11) running around the middle axis (9). The inner surface (11) comprises a first zone (21), and a second zone (22), which differs from the first zone. The first zone (21) comprises a reduced peak height Rpk of less than 0.2 μm, a core roughness depth Rk of 0.05 to 0.35 μm and a reduced groove depth Rvk of 1.5 to 2.5 μm. The second zone (22) comprises a reduced peak height Rpk of less than 0.2 μm, a core roughness depth Rk of 0.05 to 0.35 μm and a reduced groove depth Rvk of 0.5 to 2.5 μm.
Claims13
A cylinder liner for use in an internal combustion engine, the cylinder liner comprising:
- a middle axis, and
- an inner surface running around the middle axis,
- wherein the inner surface comprises a first zone, which runs around the middle axis, and a second zone which runs around the middle axis,
- wherein the first zone and the second zone are arranged next to each other when viewed along the middle axis,
- wherein the first zone comprises a reduced peak height Rpk of less than 0.2 μm, a core roughness depth Rk of 0.05 to 0.35 μm and a reduced groove depth Rvk of 1.5 to 2.5 μm, and
- wherein in the second zone the reduced peak height Rpk is less than 0.2 μm, the core roughness depth Rk is 0.05 to 0.35 μm and the reduced groove depth Rvk is 0.5 to 2.5 μm,
- wherein the first zone comprises a smallest material ratio Mr1 of less than 10% and a biggest material ratio Mr2 of 60 to 75%,
- wherein in the second zone the smallest material ratio Mr1 is less than 10% and the biggest material ratio Mr2 is 60 to 90%,
- wherein the inner surface further comprises a third zone which runs around the middle axis,
- wherein in the third zone the reduced peak height Rpk is less than 0.1 μm, the core roughness depth Rk is 0.05 to 0.2 μm and the reduced groove depth Rvk is 0.5 to 1.5 μm,
- wherein the second zone is arranged between the first zone and the third zone when viewed along the middle axis,
- wherein the cylinder liner is configured to receive a piston having a top dead point (OT) and a bottom dead point (UT) relative to the cylinder liner,
- wherein the first zone is positioned to include the top dead point (OT) and the third zone is positioned to include the bottom dead point (UT),
- wherein a ratio of a first height of the first zone to a total height of the inner surface of the cylinder liner is 0.02 to 0.065,
- wherein a ratio of a second height of the second zone to the total height of the cylinder liner is 0.06 to 0.1,
- wherein a ratio of a third height of the third zone to the total height of the cylinder liner is 0.7 to 0.9.
A cylinder liner for use in an internal combustion engine, the cylinder liner comprising:
- a middle axis, and
- an inner surface running around the middle axis, the inner surface comprising:
- a first zone, which runs around the middle axis, wherein the first zone includes a reduced peak height Rpk of less than 0.2 μm, a core roughness depth Rk of 0.05 to 0.35 μm, and a reduced groove depth Rvk of 1.5 to 2.5 μm;
- a second zone which runs around the middle axis, wherein the second zone includes a reduced peak height Rpk of less than 0.2 μm, a core roughness depth Rk of 0.05 to 0.35 μm and a reduced groove depth Rvk of 0.5 to 2.5 μm;
- and
- a third zone which runs around the middle axis, wherein the third zone includes a reduced peak height Rpk of less than 0.1 μm, a core roughness depth Rk of 0.05 to 0.2 μm, and a reduced groove depth Rvk of 0.5 to 1.5 μm, wherein the second zone is positioned between the first zone and the third zone when viewed along the middle axis,
- wherein the reduced groove depth Rvk of the first zone is greater than the reduced groove depth Rvk of the second zone, and the reduced groove depth Rvk of the second zone is greater than the reduced groove depth Rvk of the third zone.
Dependencies are inferred from the claim text.