Rotary shaft vibration damping
OwnerJohn C. Ziegertinventor
Life of this patent
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Abstract
Vibrations of rotary shafts, such as shafts of cutting tools used in high speed machining, are reduced by damping structures in holes in the shafts. The damping structures comprise fingers that are urged outwardly by centrifugal force due to rotation of the shafts and that slide relative to adjacent shaft surfaces due to shaft vibrations, so that vibrational energy is absorbed frictionally. Chatter, a self-excited vibration of a cutting tool, can be substantially reduced in this manner.
Claims15
A vibration damper for a hollow rotary shaft, comprising an elongated structure adapted to be inserted in the shaft for rotation therewith and having a plurality of fingers that are constructed to be urged against inner surface portions of the shaft in response to rotation of the shaft and to slide relative to the shaft in response to shaft vibrations.
In combination with a hollow rotary shaft, a vibration damper inserted in the shaft and having a plurality of fingers that extend longitudinally of the shaft, and that are constructed to be urged against inner surface portions of the shaft by centrifugal force in response to rotation of the shaft, and to slide relative to the inner surface portions in response to vibration of the shaft.
In combination with a rotary shaft, a vibration damper comprising a plurality of fingers extending in corresponding recesses in the shaft, the fingers being constructed to be urged outwardly against surface portions of the recesses in response to centrifugal force when the shaft rotates, and to slide relative to the surface portions of the recesses in response to vibration of the shaft.
A method of damping vibrations of a hollow rotating shaft, which comprises
- providing a plurality of damping fingers extending longitudinally in the shaft;
- urging the fingers against inner surface portions of the shaft in response to centrifugal force;
- and
- sliding the fingers relative to the inner surface portions of the shaft in response to shaft vibrations.
A method of damping vibrations of a hollow rotating shaft, which comprises:
- providing a damping structure in the shaft;
- urging portions of the damping structure outwardly against inner surface portions of the shaft in response to centrifugal force;
- sliding the portions of the damping structure relative to the inner surface portions of the shaft in response to vibration of the shaft;
- and
- absorbing vibrational energy by friction between the portions of the damping structure and the inner surface portions of the shaft.
Dependencies are inferred from the claim text.