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US 11,448,092 B2Granted
Torsional vibration damper
AssigneePratt & Whitney Canada Corp.
InventorGilles Begin
Life of this patent
Estimating the term…
Abstract
A rotor assembly has a drive shaft and a bladed rotor mounted to the drive shaft for rotation therewith. A dampening material is bonded to the rotor at a location where there is torsional strain energy present. Shear forces in the damping material are used to convert the torsional strain energy into heat energy, thereby providing torsional vibration damping.
Claims18
A cooling fan comprising:
- a drive shaft with an axis of rotation;
- a rotor having a hub mounted on the drive shaft, a web extending from the hub away from the axis of rotation, a circumferentially spaced array of blades on an air flow surface of the web, and a rear surface of the rotor, the rear surface having an annular concave recess around the drive shaft;
- a housing surrounding the rotor and a portion of the drive shaft, the housing having an air inlet and an air outlet, the housing defining an air flow passage with the air flow surface of the web and a shielded plenum with the rear surface of the rotor;
- and
- a vibration dampening material bonded to the rear surface of the rotor in the annular concave recess, the vibration dampening material bonded in a maximal strain zone of the rotor.
2 more elements
A method of reducing torsional vibration of a cooling fan,
- the cooling fan including a rotor having a hub mounted on a drive shaft, a web extending away from the hub, a circumferentially spaced array of fan blades on an air flow surface of the web, and a rear surface of the rotor, the method comprising:
- bonding a vibration dampening material to the rear surface of the rotor, wherein the vibration dampening material is bonded to the rear surface of the rotor at a maximal strain zone, and wherein the method further comprises determining the maximal strain zone using one of:
- finite element analysis;
- and empirical testing.
1 more element
A lightweight high speed rotor comprising:
- a drive shaft rotatable about an axis of rotation;
- a rotor carrying a plurality of blades, the rotor mounted to the drive shaft for rotation therewith, the rotor having a rear cavity;
- and
- a torsional damper bonded in the rear cavity of the rotor where torsional strain energy is present, wherein the torsional damper is composed of a vibration dampening material consisting of one of:
- particles;
- and droplets deposited on a surface of the rear cavity of the rotor.
3 more elements
Dependencies are inferred from the claim text.