US3617102A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High speed gas bearing structures
Assignee: TOYDA KOKI KK
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Filing: 1969-09-08
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Granted: 1971-11-02
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Expires: 1989-09-08
Abstract
Abstract In a high-speed gas bearing structure wherein a rotary shaft is rotatably journaled by a high-pressure thin gas film, there are provided means to detect the number of revolutions of the rotary shaft, a control circuit connected to the detecting means to produce an output signal when the number of revolutions of the rotary shaft reaches a substable region beyond the first resonance point and a control valve energized by the output from the control circuit to reduce the pressure of high-pressure gas supplied to the gas bearing.
Inventors
- 👤 Ryuji Wada
- 👤 Masuo Nakato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:45
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/06; F16C32/0603; F16C32/0614; F16C32/0629; F16C32/064; F16C32/0644; F16C32/0681; F16C32/0685; F16C32/0696
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
142 words
In a high-speed gas-bearing structure comprising a gas bearing creating a static supporting force by a film of gas supplied from outside, means to supply gas under pressure to said gas bearing, a rotary shaft journaled in said gas bearing with a small gap therebetween and rotatably supported by said static supporting force of said gas film formed in said gap, means to drive said rotary shaft, the improvement which comprises means to detect the number of revolutions of said rotary shaft, a control circuit responsive to the output of said detecting means to produce an output signal when the number of revolutions of said rotary shaft reaches a substable region beyond the first resonance point and a control valve responsive to said output signal to reduce the pressure of said gas supplied to said gas bearing from said gas supply means.
Claim 2
Dependent Claim
142 words
In a high-speed gas-bearing structure comprising a gas bearing creating a static supporting force by a film of gas supplied from outside, means to supply gas under pressure to said gas bearing, a rotary shaft journaled in said gas bearing with a small gap therebetween and rotatably supported by said static supporting force of said gas film formed in said gap, means to drive said rotary shaft, the improvement which comprises means to detect the number of revolutions of said rotary shaft, a control circuit responsive to the output of said detecting means to produce an output signal when the number of revolutions of said rotary shaft reaches a substable region beyond the first resonance point and a control valve responsive to said output signal to reduce the pressure of said gas supplied to said gas bearing from said gas supply means.
Claim 3
Dependent Claim
38 words
The high-speed gas-bearing structure according to claim 1 wherein said gas bearing comprise a radial bearing and a thrust bearing and said rotary shaft is journaled in the radial and axial directions by said radial and thrust bearings.
Claim 4
Dependent Claim
68 words
The high-speed gas bearing structure according to claim 1 wherein said means for detecting the number of revolutions of said rotary shaft comprises bright and dark portions formed on the outer periphery of said rotary shaft and light projected upon said bright and dark portions is received by a photoelectric element to generate electric pulses of the number corresponding to the number of revolutioNs of said rotary shaft.
Claim 5
Dependent Claim
71 words
The high-speed gas bearing structure according to claim 1 wherein said control circuit comprise s a digital-analogue converter for converting a digital quantity corresponding to the number of revolutions of said rotary shaft and obtained by said detecting means into an analogue quantity, an amplifier for amplifying the output of said digital-analogue converter and a Schmidt circuit which operates when the output from said amplifier reaches a preset operating voltage level.
Claim 6
Dependent Claim
58 words
The high-speed gas bearing structure according to claim 1 wherein said control valve comprises an electromagnetic valve whereby when said electromagnetic valve is deenergized by said output signal a movable valve member is moved with respect to a stationary valve member to vary the opening therebetween to reduce the pressure of said gas supplied to said gas bearing.
Claim 7
Dependent Claim
52 words
The high-speed gas-bearing structure according to claim 5 wherein the stroke of said movable valve member operated by the excitation of said output signal is made adjustable to control the opening between said movable and stationary valve members to adjust the reduction in pressure of said pressurized gas flowing through said opening.
References Cited (Backward Citations)
FR1266160A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-01 | 1975-05-03 | 1975-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-01 | 1979-05-03 | 1979-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-01 | 1983-05-03 | 1983-11-02 | $7700.00 | Window Closed / Lapsed |