US4060009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balancing rotors
Assignee: Peugeot Motor Co PLC
•
Filing: 1975-10-23
•
Granted: 1977-11-29
•
Expires: 1995-10-23
Abstract
Abstract A rotor to be balanced has an annular cavity containing two balls free to roll around the cavity. An initially inert thermo-setting adhesive is coated around the cavity. The rotor is rotated to a speed just above its first resonant frequency of vibration and the balls take up balancing positions in the cavity counter balancing the out of balance of the shaft. The adhesive is activated by a temporarily placed external heat source to permanently lock the balls in the balancing position so that the shaft is permanently balanced.
Inventors
- 👤 Howard John Wyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:14
CPC Classifications
G; G01; G01M; G01M1/00; G01M1/30; G01M1/36; F; F16; F16C; F16C3/00; F16C3/02; F16F; F16F15/00; F16F15/32; F16F15/322; F16F15/36; F16F15/363
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
155 words
A method of balancing an out of balance rotor comprising the steps of providing within a cavity encircling the rotor axis a plurality of weights which are free to move around the cavity with the cavity and said weights being separated by an initially inert thermo-setting adhesive which freely permits movement of the weights within said cavity and which subsequently may be activated to permanently bond the weights to the cavity in the required positions, rotating the shaft to a speed at which the shaft is between two resonant frequencies of vibration and is nearer the lower of those frequencies so that the weights take up positions within the cavity which counteract any out of balance condition of the shaft and then temporarily applying heat to the region of the rotor having the cavity containing the weights so as to activate the adhesive and permanently lock the weights to the cavity in the balancing position.
Claim 2
Independent Claim
155 words
A method of balancing an out of balance rotor comprising the steps of providing within a cavity encircling the rotor axis a plurality of weights which are free to move around the cavity with the cavity and said weights being separated by an initially inert thermo-setting adhesive which freely permits movement of the weights within said cavity and which subsequently may be activated to permanently bond the weights to the cavity in the required positions, rotating the shaft to a speed at which the shaft is between two resonant frequencies of vibration and is nearer the lower of those frequencies so that the weights take up positions within the cavity which counteract any out of balance condition of the shaft and then temporarily applying heat to the region of the rotor having the cavity containing the weights so as to activate the adhesive and permanently lock the weights to the cavity in the balancing position.
Claim 3
Dependent Claim
24 words
A method as claimed in claim 1 wherein the two reasonant frequencies are the first and second resonant frequencies of vibration of the shaft.
Claim 4
Dependent Claim
30 words
A method as claimed in claim 1 wherein the shaft is rotated to a speed at which it is just above the lower of the two resonant frequencies of vibration.
Claim 5
Dependent Claim
30 words
A method as claimed in claim 1 wherein the rotor is a propeller shaft of a vehicle and wherein the propeller shaft is balanced when in situ on the vehicle.
Claim 6
Dependent Claim
16 words
A method as claimed in claim 1 wherein the thermosetting bonding agent is an epoxy resin.
Claim 7
Dependent Claim
36 words
A method as claimed in claim 1 wherein the heat is temporarily applied to the part of the rotor containing the cavity by temporarily encircling such part of the rotor with a high frequency heating coil.
Claim 8
Dependent Claim
33 words
A method as claimed in claim 1 in which the rotor is hollow with the weights being located in the hollow rotor itself or in a housing secured in or around the rotor.
Claim 9
Dependent Claim
41 words
A method as claimed in claim 1 wherein the rotor is a hollow annular housing and the weights comprise at least two balls located within and free to roll around the housing, the housing having said adhesive applied on its surface.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-28 | 1981-05-30 | 1981-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-28 | 1985-05-30 | 1985-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-28 | 1989-05-30 | 1989-11-29 | $7700.00 | Window Closed / Lapsed |