A shaft balancing device having first and second supports, which are rotatable about an axis, a motor drivingly coupled to the first support, an electromagnet, which has a plurality of coil units that are disposed circumferentially about the axis, and a control module. The control module is configured to separately control operation of each of the coil units to generate a predetermined composite magnetic field that is an aggregate of a plurality of magnetic fields produced by the plurality of coil units. The predetermined composite magnetic field is fixed relative to a datum that is rotatable about the axis with the first support. The control module is further configured to rotate the predetermined composite magnetic field about the axis at a rotational velocity of the first support.

A shaft balancing device having first and second supports, which are rotatable about an axis, a motor drivingly coupled to the first support, an electromagnet, which has a plurality of coil units that are disposed circumferentially about the axis, and a control module. The control module is configured to separately control operation of each of the coil units to generate a predetermined composite magnetic field that is an aggregate of a plurality of magnetic fields produced by the plurality of coil units. The predetermined composite magnetic field is fixed relative to a datum that is rotatable about the axis with the first support. The control module is further configured to rotate the predetermined composite magnetic field about the axis at a rotational velocity of the first support.

A rotor has a rotor body having: a flange with a circumferential array of discontiguous apertures; and a surface spaced apart from the flange. One or more rotor balance weight assemblies each have a weight and a fastener. The weight has: a passageway having a first end and a second end; an internal thread along the passageway; and a boss at the first end of the passageway. The boss is in a respective one of the apertures. The fastener has: a shank having a first end and a second end and an external thread engaged to the passageway internal thread; an engagement feature at the shank first end for engagement by a tool to turn the fastener; and a head at the second end contacts the surface.

A rotor has a rotor body having: a flange with a circumferential array of discontiguous apertures; and a surface spaced apart from the flange. One or more rotor balance weight assemblies each have a weight and a fastener. The weight has: a passageway having a first end and a second end; an internal thread along the passageway; and a boss at the first end of the passageway. The boss is in a respective one of the apertures. The fastener has: a shank having a first end and a second end and an external thread engaged to the passageway internal thread; an engagement feature at the shank first end for engagement by a tool to turn the fastener; and a head at the second end contacts the surface.

A method of manufacturing a crankshaft includes the steps of: (1) forming a crankshaft blank via a first half and a second half; (2) measuring a plurality of surface variations between a predetermined surface in a first region and a corresponding predetermined surface in a second region of the crankshaft blank; (3) calculating centering offset data based on the plurality of surface variations; (4) machining a pair center holes based on the centering offset data; (5) machining a counterweight and a journal relative to the pair of center holes to produce a partially machined crankshaft; (5) milling and grinding the partially machined crankshaft to produce a finished machined crankshaft; and (6) rotating the finished machined crankshaft typically on the outermost main journals in a final balancing machine and then modifying the counterweights to eliminate undesirable vibration generated during the rotation and engine operation.

A method is described for calibrating a balancing machine, in which a rotor (1) to be corrected is rotatably mounted in bearings (2) and a correction run k is performed, wherein at least one measuring sensor (3) determines an initial vibration of the rotor (1) prior to an imbalance correction and transmits this vibration to an evaluation device (4), which stores the measured value as vibration vector {right arrow over (s)}.sub.0. After an imbalance on the rotor (1) is corrected, a residual vibration of the rotor (1) is measured by measuring sensor (3), transmitted to the evaluation unit (4) and stored as vibration vector {right arrow over (s)}.sub.1. The difference {right arrow over (s)}={right arrow over (s)}.sub.1{right arrow over (s)}.sub.0 formed from the measurement data and the corrected imbalance is stored for compensation run k as {right arrow over (s)}.sub.k and {right arrow over (u)}.sub.k by the evaluation unit (4). To undertake a calibration of the machine, one can either determine a process calibration matrix K by solving the equation system S=UK.sup.T using the collected measurement data or one can select an already available process calibration matrix using the initial vibration {right arrow over (s)}.sub.0 and/or imbalance vector {right arrow over (u)} and store it as a calibration matrix in the evaluation unit (4) and use it to calculate an unknown imbalance vector of a rotor (1).

A method is described for calibrating a balancing machine, in which a rotor (1) to be corrected is rotatably mounted in bearings (2) and a correction run k is performed, wherein at least one measuring sensor (3) determines an initial vibration of the rotor (1) prior to an imbalance correction and transmits this vibration to an evaluation device (4), which stores the measured value as vibration vector {right arrow over (s)}.sub.0. After an imbalance on the rotor (1) is corrected, a residual vibration of the rotor (1) is measured by measuring sensor (3), transmitted to the evaluation unit (4) and stored as vibration vector {right arrow over (s)}.sub.1. The difference {right arrow over (s)}={right arrow over (s)}.sub.1{right arrow over (s)}.sub.0 formed from the measurement data and the corrected imbalance is stored for compensation run k as {right arrow over (s)}.sub.k and {right arrow over (u)}.sub.k by the evaluation unit (4). To undertake a calibration of the machine, one can either determine a process calibration matrix K by solving the equation system S=UK.sup.T using the collected measurement data or one can select an already available process calibration matrix using the initial vibration {right arrow over (s)}.sub.0 and/or imbalance vector {right arrow over (u)} and store it as a calibration matrix in the evaluation unit (4) and use it to calculate an unknown imbalance vector of a rotor (1).

A method for balancing a vehicle wheel includes mounting a wheel to be balanced on a rotating shaft of a machine computerized for measuring imbalances, and selecting an optimum commercial balancing weight which, when positioned on a correction plane, minimizes residual imbalance on reference planes of the wheel where the balancing tolerance is considered. One compares the residual imbalance value at the reference planes with the prescribed balancing tolerance after subtracting a vector of the static imbalance generated by the optimum balancing weight. An indicator device is activated to indicate on the wheel the optimum axial position of a correction plane for a balancing weight where the residual imbalance at the reference planes is within tolerance.

A device for self-balancing a rotating part, such as a propeller, along a given axis is disclosed. The propeller 102 coupled to, a drive shaft with freedom for linear movement along longitudinal axis L-L; at least one pair of levers 614/616, comprising a first lever 614-1/616-1 and a second lever 614-2/616-2, that are pivotally mounted on mounting plate 606 at two diametrically opposite points 618; and at least one pair of weights 622 fixed at external ends of the levers 614/616. inner ends of levers 614/616 are operatively coupled to the propeller 102 such that when propeller 102 undergoes a linear movement in any direction along the longitudinal, axis L-L due to unbalance, inner ends of levers are, moved to cause the weights 622 to move to provide a balancing force to neutralize the unbalance in the propeller. An embodiment with only one pair of levers is also disclosed.

A device for self-balancing a rotating part, such as a propeller, along a given axis is disclosed. The propeller 102 coupled to, a drive shaft with freedom for linear movement along longitudinal axis L-L; at least one pair of levers 614/616, comprising a first lever 614-1/616-1 and a second lever 614-2/616-2, that are pivotally mounted on mounting plate 606 at two diametrically opposite points 618; and at least one pair of weights 622 fixed at external ends of the levers 614/616. inner ends of levers 614/616 are operatively coupled to the propeller 102 such that when propeller 102 undergoes a linear movement in any direction along the longitudinal, axis L-L due to unbalance, inner ends of levers are, moved to cause the weights 622 to move to provide a balancing force to neutralize the unbalance in the propeller. An embodiment with only one pair of levers is also disclosed.