Patent US3926074A successfully refreshed from Google Patents.
US3926074A
Expired / Lapsed
US
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Resonance preventive system for power transmission systems of internal combustion engines
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1974-03-27
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Granted: 1975-12-16
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Expires: 1994-03-27
Abstract
Abstract Herein disclosed is a resonance preventive system for use with a power transmission system of an internal combustion engine. The resonance preventive system comprises a fluid coupling with variable torsional rigidity disposed midway of the power transmission system, a detector for detecting operation conditions of the engine in terms of its RPM and/or its applied load for producing a signal indicative of the operating conditions, and a control responsive to the signal of the detector for supplying a fluid control signal, which has its pressure and flow rate varied in accordance with the engine operating conditions, to the fluid coupling so that the resonance point of the power transmission system may be shifted in response to the variation in the engine operating conditions.
Inventors
- 👤 Eisuke Sugahara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:23
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/10; F16F15/12; F16F15/121; F16F15/124
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
137 words
A resonance preventive system for use with a power transmission system of an internal combustion engine, said resonance preventive system comprising: a fluid coupling with variable torsional rigidity disposed midway of the power transmission system between input and output transmission system elements, said coupling comprising a hollow annular rubber member means fixedly coupled between said input and output elements and forming a fluid pressure chamber therebetween; means for detecting the rotative speed and/or the applied load on said engine and for producing a signal indicative thereof; and control means responsive to said signal for supplying a control fluid whose pressure and flow rate varies in accordance with variance of said signal to said fluid coupling chamber to vary the torsional rigidity of said annular rubber member means to shift the resonance point of the power transmission system.
Claim 2
Dependent Claim
137 words
A resonance preventive system for use with a power transmission system of an internal combustion engine, said resonance preventive system comprising: a fluid coupling with variable torsional rigidity disposed midway of the power transmission system between input and output transmission system elements, said coupling comprising a hollow annular rubber member means fixedly coupled between said input and output elements and forming a fluid pressure chamber therebetween; means for detecting the rotative speed and/or the applied load on said engine and for producing a signal indicative thereof; and control means responsive to said signal for supplying a control fluid whose pressure and flow rate varies in accordance with variance of said signal to said fluid coupling chamber to vary the torsional rigidity of said annular rubber member means to shift the resonance point of the power transmission system.
Claim 3
Dependent Claim
140 words
The resonance preventive system as claimed in claim 1, wherein said power transmission system comprises in order from said engine, a fly wheel, a clutch and a speed reduction mechanism, said fluid coupling is positioned between said fly wheel and said clutch, said control means comprises a fluid feeder positioned within said power transmission system intermediate said fluid coupling and said clutch, conduit means coupling said fluid feeder to said fluid coupling, a first control device, a second control device, said first control device receiving an input control signal from said detecting device and feeding an output signal to said second control device, a preset control element feeding a control signal to said second control device, and said second control device feeding a fluid control signal to said fluid feeder for controlling fluid feed from feeder to said fluid coupling.
Claim 4
Dependent Claim
119 words
The resonance preventive system as claimed in claim 1, wherein said annular rubber member means comprises a pair of annular rubber elements and wherein a hub is of a diameter less than that of said annular casing, and means secure said annular rubber elements at their peripheries respectively to said casing and said hub, means mount said hub and said casing to respective elements of said power transmission system for rotation under torisonal restraint provided by said rubber elements, at least one of said annular elements defines said fluid pressure chamber and said control fluid is supplied to said chamber, whereby, said fluid coupling has its torsional rigidity varied depending upon the pressure of the fluid within said chamber.
Claim 5
Dependent Claim
47 words
The resonance preventive system as claimed in claim 3, wherein said means forming said fluid chamber within said rubber elements comprise at least one annular passage formed within at least one of Said rubber elements with said passage lying intermediate of said annular casing and said hub.
Claim 6
Dependent Claim
32 words
The resonance preventive system as claimed in claim 3, wherein said fluid chamber is formed by the opposed surfaces of said annular rubber elements intermediate of said annular casing and said hub.
Claim 7
Dependent Claim
34 words
The resonance preventive system as claimed in claim 5, further comprising a flexible pipe carried between the opposed surfaces of said rubber elements with said pipe forming a fluid chamber internal of said elements.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |