US3814122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for preventing foaming of oil
Assignee: Atsugi Motor Parts Co Ltd
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Filing: 1972-11-10
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Granted: 1974-06-04
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Expires: 1992-11-10
Abstract
Abstract A foam-preventing device for automobile hydraulic power units, comprising an intermediate pressure chamber located between an oil tank of the unit and the outlet of a flow-rate control valve of the unit for by-passing excess oil to the oil tank. Excess oil is forced by this arrangement to flow through the intermediate chamber so as to avoid a sudden pressure change and foaming thereof.
Inventors
- 👤 S Akaike
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:34
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/28; F15; F15B; F15B21/00; F15B21/04; F15B21/047; Y; Y10; Y10T; Y10T137/00; Y10T137/4673; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7765
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
137 words
A device for preventing foaming of oil being by-passed in an automobile hydraulic power unit which latter includes a by-pass type flow-rate control valve which selectively by-passes part of the discharge from an oil pump into an oil tank so as to ensure desired oil flow toward loads of the unit, the device comprising an intermediate pressure chamber communicating with the outlet of said control valve through one port and having one orifice formed through a wall of said pressure chamber which faces said oil tank, whereby the entirety of the discharge part from said oil pump is guided to flow toward said oil tank through said orifice of the pressure chamber, the pressure of the discharge being regulated at a level between that at the discharge from said oil pump and that in said oil tank.
Claim 2
Independent Claim
137 words
A device for preventing foaming of oil being by-passed in an automobile hydraulic power unit which latter includes a by-pass type flow-rate control valve which selectively by-passes part of the discharge from an oil pump into an oil tank so as to ensure desired oil flow toward loads of the unit, the device comprising an intermediate pressure chamber communicating with the outlet of said control valve through one port and having one orifice formed through a wall of said pressure chamber which faces said oil tank, whereby the entirety of the discharge part from said oil pump is guided to flow toward said oil tank through said orifice of the pressure chamber, the pressure of the discharge being regulated at a level between that at the discharge from said oil pump and that in said oil tank.
Claim 3
Dependent Claim
22 words
The device as defined in claim 1, wherein the differential pressure across said orifice of the pressure chamber is 0.5 to 3Kg/cm2.
Claim 4
Dependent Claim
21 words
The device as defined in claim 1, wherein said pressure chamber is an elongated cylindrical chamber disposed adjacent said control valve.
Claim 5
Dependent Claim
39 words
The device as defined in claim 3, wherein said pressure chamber receives the by-pass oil from said control valve at one longitudinal end thereof while delivering the by-pass oil to said oil tank at the opposite longitudinal end thereof.
Claim 6
Dependent Claim
36 words
The device as defined in claim 3, further comprising a stay bolt for said cylindrical pressure chamber, extending along the longitudinal center line thereof, for holding members close to at least one end of said chamber.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |