US4936555A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vibration damping device
Assignee: Bridgestone Corp
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Filing: 1989-07-31
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Granted: 1990-06-26
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Expires: 2009-07-31
Abstract
Abstract A bush-type vibration damping device having an inner cylinder and an outer cylinder arranged in such a way that their axes extend in parallel with each other, and an elastic member is interposed between the inner and outer cylinders. A pressure receiving chamber, a first sub-liquid chamber and a second sub-liquid chamber are provided at one side of the inner cylinder. The first sub-liquid chamber has a not smaller resistance to expansion by pressure than the second sub-liquid chamber. The first and second sub-liquid chambers are connected to the pressure receiving liquid chamber through first and second communication passages, respectively. The second communication passage produces a not smaller resistance to flowing liquid than the first communication passage. Vibration of a comparatively low frequency and large amplitude is adsorbed by the flow resistance encountered by a liquid displaced through the second communication passage, while vibration of a comparatively high frequency and small amplitude causes a resonance of the liquid in the first passage so as to limit increase in the dynamic spring constant.
Inventors
- 👤 Tatsuro Ishiyama
- 👤 Takao Ushijima
- 👤 Toshiyuki Tabata
- 👤 Toshihiko Aihara
- 👤 Hajime Takeguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:57
CPC Classifications
F; F16; F16F; F16F13/00; F16F13/04; F16F13/06; F16F13/08; F16F13/14
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
243 words
A vibration damping device having an inner cylinder and an outer cylinder arranged through the intermediary of an elastic body in such a way that the axes of said cylinders extend in parallel with each other, comprising: (a) an expandable and contractable pressure-receiving liquid chamber disposed on one side of said inner cylinder and facing said elastic member; (b) first and second sub-liquid chambers provided on the same side of said inner cylinder as said pressure-receiving liquid chamber; (c) a first communication passage providing communication between said pressure-receiving liquid chamber and said first sub-liquid chamber; (d) a second communication passage providing communication between said pressure-receiving liquid chamber and said second sub-liquid chamber and producing a not smaller resistance than said first communication passage to a liquid flowing therethrough; (e) first expansion and contraction means for allowing said first sub-liquid chamber to expand and contract; and (f) second expansion and contraction means for allowing said second sub-liquid chamber to expand and contract, said second expansion and contraction means having resistance to pressure not greater than that of said first expansion and contraction means; whereby, vibration of a comparatively law frequency and large amplitude is absorbed by the resistance encountered with the liquid flowing through said second communication passage, while vibration of a comparatively high frequency and small amplitude vibration causes a resonance of the liquid in said first communication passage so as not to increase the dynamic spring constant of said vibration damping device.
Claim 2
Dependent Claim
243 words
A vibration damping device having an inner cylinder and an outer cylinder arranged through the intermediary of an elastic body in such a way that the axes of said cylinders extend in parallel with each other, comprising: (a) an expandable and contractable pressure-receiving liquid chamber disposed on one side of said inner cylinder and facing said elastic member; (b) first and second sub-liquid chambers provided on the same side of said inner cylinder as said pressure-receiving liquid chamber; (c) a first communication passage providing communication between said pressure-receiving liquid chamber and said first sub-liquid chamber; (d) a second communication passage providing communication between said pressure-receiving liquid chamber and said second sub-liquid chamber and producing a not smaller resistance than said first communication passage to a liquid flowing therethrough; (e) first expansion and contraction means for allowing said first sub-liquid chamber to expand and contract; and (f) second expansion and contraction means for allowing said second sub-liquid chamber to expand and contract, said second expansion and contraction means having resistance to pressure not greater than that of said first expansion and contraction means; whereby, vibration of a comparatively law frequency and large amplitude is absorbed by the resistance encountered with the liquid flowing through said second communication passage, while vibration of a comparatively high frequency and small amplitude vibration causes a resonance of the liquid in said first communication passage so as not to increase the dynamic spring constant of said vibration damping device.
Claim 3
Dependent Claim
22 words
A vibration damping device according to claim 1, wherein said first and second communication passages are arranged to surround said inner cylinder.
Claim 4
Dependent Claim
17 words
A vibration damping device according to claim 1, wherein said second communication passage surrounds said inner cylinder.
Claim 5
Dependent Claim
41 words
A vibration damping device according to claim 1, wherein said pressure-receiving liquid chamber is disposed in the vicinity of said inner cylinder, while said first and second sub-liquid chambers are disposed on the radially outer side of said pressure-receiving liquid chamber.
Claim 6
Dependent Claim
28 words
A vibration damping device according to claim 2, wherein said first and second communication passages are curved at an equal radius of curvature and have different cross-sectional areas.
Claim 7
Dependent Claim
24 words
A vibration damping device according to claim 1, wherein said first and second sub-liquid chambers are separated from each other by an elastic member.
Claim 8
Dependent Claim
41 words
A vibration damping device according to claim 6, wherein an elastic member for allowing expansion and contraction of said second sub-liquid chamber is more easily deformable than said elastic member which separates said first and second sub-liquid chambers from each other.
Claim 9
Dependent Claim
31 words
A vibration damping device according to claim 1, wherein said pressure-receiving chamber and said first sub-liquid chamber are separated from each other by a plate member fixed in said elastic member.
Claim 10
Dependent Claim
28 words
A vibration damping device according to claim 1, wherein said first and second communication passages surround an intermediate cylinder which is fixed to said outer cylinder coaxially therewith.
Claim 11
Dependent Claim
171 words
A vibration damping device having an inner cylinder and an outer cylinder arranged through the intermediary of an elastic member in such a way that the axes of said cylinders extend in parallel with each other, comprising: (a) a pressure-receiving chamber disposed between said inner cylinder and said outer cylinder; (b) a first sub-liquid chamber disposed on the outer side of said pressure-receiving chamber; (c) an expandable and contractable second sub-liquid chamber disposed on the outer side of said first sub-liquid chamber; (d) expansion and contraction means for allowing expansion and contraction of said first sub-liquid chamber, said expansion and contracting means having a greater resistance to pressure than said second sub-liquid chamber; (e) a first communication passage providing communication between said pressure-receiving liquid chamber and said first sub-liquid chamber; and (f) a second communication passage surrounding said inner cylinder and providing communication between said pressure-receiving liquid chamber and said second sub-liquid chamber, said second communication passage providing a greater resistance than said first communication passage to a liquid flowing therethrough.
Claim 12
Dependent Claim
171 words
A vibration damping device having an inner cylinder and an outer cylinder arranged through the intermediary of an elastic member in such a way that the axes of said cylinders extend in parallel with each other, comprising: (a) a pressure-receiving chamber disposed between said inner cylinder and said outer cylinder; (b) a first sub-liquid chamber disposed on the outer side of said pressure-receiving chamber; (c) an expandable and contractable second sub-liquid chamber disposed on the outer side of said first sub-liquid chamber; (d) expansion and contraction means for allowing expansion and contraction of said first sub-liquid chamber, said expansion and contracting means having a greater resistance to pressure than said second sub-liquid chamber; (e) a first communication passage providing communication between said pressure-receiving liquid chamber and said first sub-liquid chamber; and (f) a second communication passage surrounding said inner cylinder and providing communication between said pressure-receiving liquid chamber and said second sub-liquid chamber, said second communication passage providing a greater resistance than said first communication passage to a liquid flowing therethrough.
Claim 13
Dependent Claim
17 words
A vibration damping device according to claim 10, wherein said first communication passage surrounds said inner cylinder.
Claim 14
Dependent Claim
35 words
A vibration damping device according to claim 11, wherein said first and second communication passages surround said inner cylinder at an equal radius of curvature and have different cross-sectional areas for passage of a liquid.
Claim 15
Dependent Claim
27 words
A vibration damping device according to claim 10, wherein said pressure-receiving chamber and said first sub-liquid chambers are separated from each other through a thin-walled plate member.
Claim 16
Dependent Claim
23 words
A vibration damping device according to claim 13, wherein said first communication passage is formed so as to penetrate said thin-walled plate member.
Claim 17
Dependent Claim
24 words
A vibration damping device according to claim 10, wherein said first and second sub-liquid chambers are separated from each other by an elastic diaphragm.
Claim 18
Dependent Claim
37 words
A vibration damping device according to claim 15, wherein a part of the wall defining said second sub-liquid chamber is made of an elastic diaphragm thinner than said elastic diaphragm separating said first and second sub-liquid chambers.
Claim 19
Dependent Claim
113 words
A vibration damping device according to claim 10, wherein said first and second sub-liquid chambers communicate with each other via a small chamber which communicates with said sub-liquid chambers through a multiplicity of small holes, said small chamber accommodating a thin-walled vibration plate, aid vibration plate being held in contact with the wall of said small chamber in response to a vibration of a low frequency and a large amplitude so as to disconnect both sub-liquid chambers from each other, whereas, when vibration of a high frequency and a low amplitude is applied, said vibration plate finely vibrates so as to prevent increase in the dynamic spring constant of said vibration damping device.
Claim 20
Dependent Claim
214 words
A vibration damping device arranged between a vibration source and a part to be isolated from the vibration, comprising: (a) an inner cylinder connected to one of said vibration source and said part; (b) an outer cylinder connected to the other of said vibration source and said part and arranged in parallel with said inner cylinder; (c) an elastic body member through which said inner and outer cylinders are connected to each other; (d) a pressure-receiving chamber formed in said elastic member at one side of said inner cylinder and capable of expanding and contracting in response to vibration; (e) a first sub-liquid chamber disposed between said pressure-receiving chamber and said outer cylinder and capable of expanding and contracting; (f) a second sub-liquid chamber provided between said first sub-liquid chamber and said outer cylinder and capable of expanding and contracting; (g) a first communication passage providing communication between said pressure-receiving chamber and said first sub-liquid chamber; (h) a second communication passage providing communication between said pressure-receiving liquid chamber and said second sub-liquid chamber and producing a not smaller flow resistance than said first communication passage to a liquid flowing therethrough; and (i) expansion and contraction means for enabling said first sub-liquid chamber to have a greater resistance to pressure than said second sub-liquid chamber.
Claim 21
Dependent Claim
214 words
A vibration damping device arranged between a vibration source and a part to be isolated from the vibration, comprising: (a) an inner cylinder connected to one of said vibration source and said part; (b) an outer cylinder connected to the other of said vibration source and said part and arranged in parallel with said inner cylinder; (c) an elastic body member through which said inner and outer cylinders are connected to each other; (d) a pressure-receiving chamber formed in said elastic member at one side of said inner cylinder and capable of expanding and contracting in response to vibration; (e) a first sub-liquid chamber disposed between said pressure-receiving chamber and said outer cylinder and capable of expanding and contracting; (f) a second sub-liquid chamber provided between said first sub-liquid chamber and said outer cylinder and capable of expanding and contracting; (g) a first communication passage providing communication between said pressure-receiving chamber and said first sub-liquid chamber; (h) a second communication passage providing communication between said pressure-receiving liquid chamber and said second sub-liquid chamber and producing a not smaller flow resistance than said first communication passage to a liquid flowing therethrough; and (i) expansion and contraction means for enabling said first sub-liquid chamber to have a greater resistance to pressure than said second sub-liquid chamber.
Claim 22
Dependent Claim
19 words
A vibration damping device according to claim 18, wherein said first and second communication passages surround said inner cylinder.
Claim 23
Dependent Claim
60 words
A vibration damping device according to claim 18, wherein said first and second sub-liquid chambers are separated from each other by a first thin-walled elastic member, said second sub-liquid chamber being defined by a second thin-walled elastic member facing ambient air, said first thin-walled elastic member has a greater resistance to deformation by pressure than said second thin-walled elastic member.
References Cited (Backward Citations)
US4840357A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-06-25 | 1993-12-25 | 1994-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-06-25 | 1997-12-25 | 1998-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-06-25 | 2001-12-25 | 2002-06-26 | $7700.00 | Window Closed / Lapsed |