Granted Patent B2

US 7,341,533 · App. 10/693,186 · Granted Mar 11, 2008

Abstract

Claims (30)

1. A transmission comprising:

an aluminum housing member having a bore formed therein;

a rotatable member supported on a bearing within the bore; and

wherein said bore includes a layer of thermal spray coating for improved wear resistance so that the bore supports the bearing without a steel sleeve therebetween; and

wherein said thermal spray coating comprises a steel alloy having 0.1 to 1% weight C, 0 to 14% weight Cr, 0 to 2% weight Mn, 0 to 2% weight Ni, 0 to 1% weight Si, and the balance Fe.

2. The transmission of claim 1 , wherein said steel alloy has a coating thickness between approximately 0.1 and 0.5 mm.

3. The transmission of claim 1 , wherein said thermal spray coating is applied by a two wire arc spray process.

4. The transmission of claim 1 , wherein said thermal spray coating is applied by a plasma thermal spray coating process.

5. The transmission of claim 1 , wherein said transmission is a continuously variable transmission (CVT), said rotatable member is a rotatable pulley member, and said aluminum housing member comprises a transmission case.

6. The transmission of claim 1 , wherein said transmission is a continuously variable transmission (CVT), said rotatable member is a rotatable pulley member, and said aluminum housing member comprises a transmission cover.

7. A transmission comprising:

an aluminum housing member having a bore formed therein; and

a rotatable member supported on a bearing within the bore;

wherein said bore includes a layer of thermal spray coating for improved wear resistance so that the bore supports the bearing without a steel sleeve therebetween; and

wherein said thermal spray coating comprises a nickel alloy having 15 to 25% weight Cr, 0 to 20% weight Al, 0 to 5% Y, and the balance Ni.

8. The transmission of claim 7 , wherein said nickel alloy has a coating thickness between approximately 0.02 and 0.08 mm.

9. A transmission comprising:

an aluminum housing member having a bore formed therein; and

a rotatable member supported on a bearing within the bore;

wherein said bore includes a layer of thermal spray coating for improved wear resistance so that the bore supports the bearing without a steel sleeve therebetween; and

wherein said thermal spray coating comprises a copper alloy, having 7 to 13% weight Al, 0 to 5% weight Fe, 0 to 6% Ni, and the balance Cu.

10. A continuously variable transmission (CVT) comprising:

an aluminum housing member having a bore formed therein;

a rotatable pulley member supported on a bearing within the bore;

wherein said bore includes a layer of thermal spray coating for improved wear resistance so that the bore supports the bearing without a steel sleeve therebetween; and

wherein said thermal spray coating comprises a steel alloy, having 0.1 to 1% weight C, 0 to 14% weight Cr, 0 to 2% weight Mn, 0 to 2% weight Ni, 0 to 1% weight Si, and the balance Fe.

11. The CVT of claim 10 , wherein said thermal spray coating is applied by a two wire arc spray process.

12. The CVT of claim 10 , wherein said thermal spray coating is applied by a plasma thermal spray coating process.

13. The CVT of claim 10 , wherein said aluminum housing member comprises a transmission case.

14. The CVT of claim 10 , wherein said aluminum housing member comprises a transmission cover.

Assignments (13)