IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
UP-0571533
(2004-09-10)
|
등록번호 |
US-7694540
(2010-05-20)
|
우선권정보 |
JP-2003-317607(2003-09-10); JP-2004-021005(2004-01-29) |
국제출원번호 |
PCT/JP2004/013227
(2004-09-10)
|
§371/§102 date |
20060310
(20060310)
|
국제공개번호 |
WO05/026574
(2005-03-24)
|
발명자
/ 주소 |
- Ishida, Yukio
- Liu, Jun
- Uchimura, Shoji
- Morimitsu, Hideki
- Ishiguro, Hirohide
|
출원인 / 주소 |
- Lin, Jun
- Ishida, Yukio
- Sintokogio, Ltd.
|
대리인 / 주소 |
Finnegan, Henderson, Farabow, Garrett & Dunner, L.L.P.
|
인용정보 |
피인용 횟수 :
14 인용 특허 :
3 |
초록
▼
A device for damping runout vibration of a rotating shaft system at least including a rotating shaft and a rotating body rotatably supported by the shaft. A ring (24) is provided outside a bearing (23) fitted on a rotating shaft with a clearance between the ring and an outer ring of the bearing. A v
A device for damping runout vibration of a rotating shaft system at least including a rotating shaft and a rotating body rotatably supported by the shaft. A ring (24) is provided outside a bearing (23) fitted on a rotating shaft with a clearance between the ring and an outer ring of the bearing. A vibration damping mechanism includes, in order to suppress runout vibration of a rotating shaft system from the radially outside of the ring (24), a blade spring (25) compressed by a preload and a stopper (26) for setting an operation limit of the blade spring.
대표청구항
▼
The invention claimed is: 1. A device for suppressing the whirling vibration of a rotating-shaft system that includes at least a rotating shaft and a rotating rotor supported by the rotating shaft, said device comprising: a first anti-rotating casing for surrounding said rotating shaft such that a
The invention claimed is: 1. A device for suppressing the whirling vibration of a rotating-shaft system that includes at least a rotating shaft and a rotating rotor supported by the rotating shaft, said device comprising: a first anti-rotating casing for surrounding said rotating shaft such that a radial direction of said casing is substantially orthogonal to said rotating shaft, wherein said first anti-rotating casing is arranged so that a whirling vibration of said rotating-shaft system can be transferred to said first anti-rotating casing, but wherein said first anti-rotating casing cannot rotate; a second anti-rotating casing laterally-placed apart from said first anti-rotating casing to create a clearance within a predetermined range between said first anti-rotating casing and said second anti-rotating casing; and suppressing means for suppressing the whirling vibration, said suppressing means including an elastic member having one end attached to a fixed position on an outside of said second anti-rotating casing, and having a free end, wherein said elastic member is compressed by applying a preload so as to suppress the whirling vibration of said rotating-shaft system from radiating outward thereof, and a stopper member that is located at a side of the free end of the elastic member for limiting an operating range of said elastic member. 2. The device of claim 1, wherein a deflection difference is provided between said clearance that generates a force that is provided to dampen the whirling vibration. 3. The device of claim 1, wherein said stopper member mechanically limits said operating range of said elastic member. 4. The device of claim 1, further comprising adjusting means for adjusting the magnitude of the restorative force of said elastic member, the magnitude of said preload to compress said elastic member, and said position of the stopper member. 5. The device of claim 1, wherein the whirling vibration of the rotating-shaft system is an unsteady vibration. 6. The device of claim 1, wherein said rotating-shaft system cooperates in a rotating machinery. 7. The device of claim 6, wherein said rotating machinery includes a washing machine or a centrifugal machine. 8. The device of claim 7, wherein said rotating machinery is a washing machine that includes a washing tub and a motor, and the rotating-shaft system is attached to a shaft that connects the washing tub to a rotating axis of said motor. 9. The device of claim 8, wherein the location of said first anti-rotating casing is beneath said washing tub, or is laterally on said washing tub, or is located near said washing tub. 10. The device of claim 1, wherein said clearance is variable, and wherein a force for suppressing the whirling vibration is provided by a restoring force of said rotating shaft itself or provided by restoring forces of said rotating shaft and a plurality of springs, based on the sizes of the clearance. 11. The device of any one of claims 1 or 10, wherein said first anti-rotating casing is a bearing for supporting said rotating shaft. 12. The device of any one of claims 1 or 10, wherein said second anti-rotating casing forms an annular shape. 13. The device of any one of claims 1 or 10, wherein a plurality of said suppressing means is positioned at a plurality of positions. 14. The device of claim 13, wherein a deflection difference is provided between said elastic member of one of said suppressing means and said elastic member of another suppressing means to generate a force that is provided to suppress the whirling vibration. 15. The device of claim 13, wherein each elastic member is a blade-spring assembly. 16. The device of claim 15, wherein each blade-spring assembly comprises one sheet of a blade spring or blade springs in which a plurality of blade springs is stacked. 17. The device of claim 16, wherein the number of said blade springs or said blade springs of at least one blade-spring assembly differs from that of all other blade-spring assemblies. 18. A device for suppressing a whirling vibration of a rotating-shaft system that includes at least a rotating shaft and a rotating rotor supported by the rotating shaft, said device comprising: one anti-rotating casing for surrounding said rotating shaft to create a clearance between said anti-rotating casing and said rotating shaft such that the radial direction of said casing is substantially orthogonal to said rotating shaft, wherein said casing is arranged such that the whirling vibration of said rotating-shaft system can be transferred to said casing, but such that said casing cannot rotate: means for suppressing the whirling vibration including at least one elastic member having one end attached to a fixed position on an outside of said one anti-rotating casing, and having a free end, wherein said elastic member is compressed by applying a preload so as to suppress the whirling vibration of said rotating-shaft system; and a stopper member that is located at a side of the free end of the elastic member for limiting an operating range of said elastic member. 19. The device of claim 18, further comprising a damping unit having a plurality of blade springs that are in contact with said rotating shaft for continuously damping the energy of said rotor. 20. The device of claim 18, wherein said anti-rotating casing is co-axially mounted on said rotating shaft through the intermediary of a bearing for supporting said rotating shaft. 21. The device of claim 18, wherein a predetermined range of the size of said clearance is established by a combination of said elastic member and said stopper member. 22. A method for suppressing a whirling vibration of a rotating-shaft system that includes at least a rotating shaft and a rotating rotor supported by the rotating shaft, said method comprising the steps of: providing a first anti-rotating casing for surrounding said rotating shaft such that a radial direction of said casing is substantially orthogonal to said rotating shaft, wherein said casing is arranged so that a whirling vibration of said rotating-shaft system can be transferred to said casing, but so that said casing cannot rotate; outwardly and concentrically providing a second anti-rotating casing for said first anti-rotating casing to create a clearance within a predetermined range between said first anti-rotating casing and said second anti-rotating casing; providing an auxiliary spring that is compressed by applying a preload near said second anti-rotating casing so as to contact or not contact the periphery of said second anti-rotating casing based on the magnitude of the whirling vibration of said rotating-shaft system; and wherein the vibration characteristic of said rotating-shaft system is in a first state or a second state based on whether said auxiliary spring contacts said first anti-rotating casing, if r≦δ, said vibration characteristic being in said first state where said rotating-shaft system vibrates sympathetically in ω=√{square root over ( )}(k1/m), since the spring constant of k1 of said rotating shaft is small, and if r≧δ, said vibration characteristic is in said second state where said rotating-shaft system vibrates sympathetically at ω=√{square root over ( )}{(k1+k2)/m}, since the stiffness of the spring constant of k2 of said auxiliary spring is added, where ω is a rotation velocity of said rotor, δ is a width of said clearance measured along a radial direction of said casings, m is the combined masses of said rotor and said first anti-rotating casing and r is a displacement of said rotor.
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