Ball bearing turbocharger balancer
First Claim
1. A method of balancing a core assembly of a turbocharger, the core assembly including a rotor assembly having a compressor wheel and a turbine wheel connected for common rotation by a shaft, the method comprising:
- determining a first bending critical speed of the rotor assembly;
mounting the core assembly in a balancing machine;
engaging a drive source with the core assembly to rotate the rotor assembly;
rotating the rotor assembly to an initial phase speed that is between approximately 5500 revolutions per minute and the first bending critical speed; and
sensing a state of imbalance of the rotor assembly at the initial phase speed.
1 Assignment
0 Petitions
Accused Products
Abstract
A method of balancing a core assembly of a turbocharger. The core assembly may include a rotor assembly having a compressor wheel and a turbine wheel connected for common rotation by a shaft. A first bending critical speed of the rotor assembly may be determined. The core assembly may be mounted in a balancing machine. A drive source may be engaged with the core assembly to impart rotation. The rotor assembly may be rotated at an initial phase speed that is between approximately 5500 revolutions per minute and the first bending critical speed. A state of imbalance of the rotor assembly may be determined at the initial phase speed.
22 Citations
28 Claims
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1. A method of balancing a core assembly of a turbocharger, the core assembly including a rotor assembly having a compressor wheel and a turbine wheel connected for common rotation by a shaft, the method comprising:
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determining a first bending critical speed of the rotor assembly; mounting the core assembly in a balancing machine; engaging a drive source with the core assembly to rotate the rotor assembly; rotating the rotor assembly to an initial phase speed that is between approximately 5500 revolutions per minute and the first bending critical speed; and sensing a state of imbalance of the rotor assembly at the initial phase speed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of balancing a core assembly of a turbocharger comprising:
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assembling a rotor assembly from a compressor wheel and a turbine wheel connected for common rotation by a shaft; determining a first bending critical speed of the rotor assembly, wherein the first bending critical speed corresponds to a natural frequency of the rotor assembly; loading the core assembly in a balancing machine; engaging a drive source with the core assembly to rotate the rotor assembly; rotating the rotor assembly to an initial phase speed that is between approximately 5500 revolutions per minute and the first bending critical speed; sensing a state of imbalance of the rotor assembly; calculating a correction amount needed to provide balance to the rotor assembly based on the state of imbalance of the rotor assembly; modifying a mass of the rotor assembly based on the correction amount; and rotating the rotor assembly at a secondary phase speed after modifying the mass, wherein the secondary phase speed is equal to an operational speed of the core assembly. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of balancing a turbocharger that has a ball bearing system supporting a rotor assembly, the method comprising:
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assembling a compressor wheel, a turbine wheel, and a shaft to form the rotor assembly; determining a first bending critical speed of the rotor assembly, wherein the first bending critical speed results in a resonant vibration response of the rotor assembly; mounting a core assembly in a balancing machine; engaging a drive source with the core assembly to rotate the rotor assembly; rotating the rotor assembly at an initial phase speed that is at least 5500 revolutions per minute and that is less than the first bending critical speed; sensing a state of imbalance of the rotor assembly; calculating a correction amount needed to provide balance to the rotor assembly based on the state of imbalance of the rotor assembly; modifying a mass of the rotor assembly based on the correction amount; and rotating the rotor assembly to a secondary phase speed after modifying the mass, wherein the secondary phase speed is equal to an operational speed of the core assembly.
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21. A method of balancing a core assembly of a turbocharger comprising:
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assembling a rotor assembly from a compressor wheel and a turbine wheel connected for common rotation by a shaft; determining a first bending critical speed of the rotor assembly, wherein the first bending critical speed corresponds to a lowest rotational speed for a natural frequency of the rotor assembly; loading the core assembly in a balancing machine; engaging a drive source with the core assembly to rotate the rotor assembly; rotating the rotor assembly to an initial phase speed that is at least 5500 revolutions per minute and is less than the first bending critical speed; sensing a state of imbalance of the rotor assembly; calculating a correction amount needed to provide balance to the rotor assembly based on the state of imbalance of the rotor assembly; stopping the rotor assembly; changing a mass of the rotor assembly based on the correction amount; and rotating the rotor assembly at a secondary phase speed after modifying the mass, wherein the secondary phase speed is equal to an operational speed of the core assembly and is faster than the first bending critical speed. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28)
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Specification