Method of manufacturing a strip for a bearing
AssigneesMahle International GmbH, Mahle Engine Systems UK Ltd, Mahle Metal Leve S/A
InventorsSylvia Campbell, Paulo R. Vieira De Morais
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Abstract
A method of manufacturing a strip for a bearing may comprise roll-bonding a bearing layer comprising a tin-free aluminium alloy directly to a base layer to form a bimetal and heat-treating the bimetal at a temperature below a recrystallization initiation temperature of the aluminium alloy. A strip for a bearing manufactured using the method, and a bearing having a strip manufactured using the method, are also provided.
Claims20
A method of manufacturing a strip for a bearing, the method comprising:
- roll-bonding a bearing layer comprising a tin-free aluminium alloy directly to a base layer to form a bimetal;
- heat-treating the bimetal at a temperature below a recrystallization initiation temperature of the tin-free aluminium alloy without performing a heat treatment to the bimetal at temperatures above the recrystallization initiation temperature of the tin-free aluminium alloy;
- and
- coating a surface of the bearing layer with a sliding layer;
- wherein only the bearing layer is roll-bonded to the base layer.
A strip for a bearing, the strip comprising:
- a base layer;
- a bearing layer comprising a tin-free aluminium alloy directly roll-bonded to the base layer;
- a sliding layer disposed on a surface of the bearing layer, the sliding layer comprising a polymer overlay;
- wherein only the bearing layer is roll-bonded to the base layer to form a bimetal;
- wherein the bimetal is heat-treatable at a temperature below a recrystallization initiation temperature of the aluminium alloy without recrystallizing a microstructure of the aluminium alloy, so that a bearing comprising the strip satisfies at least one of the following:
- at a load of 110 MPa, a fatigue test pass rate of at least 90%;
- a fatigue load of at least 120 Mpa;
- and
- a hardness loss after 500 hours in a soak test at 160° C. is less than 20%.
A strip for a bearing, the strip comprising:
- a base layer;
- and
- a bearing layer comprising a tin-free aluminium alloy, wherein the bearing layer is directly roll-bonded to the base layer to form a bimetal;
- wherein the bimetal is heat-treatable at a temperature below a recrystallization initiation temperature of the aluminium alloy, and wherein a microstructure of the aluminium alloy is not recrystallized;
- and
- a sliding layer coated onto a surface of the bearing layer, the sliding layer comprising a polymer overlay.
Dependencies are inferred from the claim text.