US4548239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic slide valve
Assignee: ESKILDSEN CHRISTAIN BISPEVAENGET 18 NYBOL 6400 SONDERBORG DENMARK
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Filing: 1984-01-16
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Granted: 1985-10-22
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Expires: 2004-01-16
Abstract
Abstract The invention relates to a hydraulic control valve assembly for controlling a consumer unit such as a servomotor of a vehicle steering system. The valve assembly has a conventional port arrangement which includes two selectively pressurizeable and drainable motor ports connectable to a servomotor and supply and exhaust ports connectable respectively to a pump and a drain tank. A slide valve has a central wall section between two motor ports which completely block a central supply port when the slide valve is in a neutral position. Two metering control load sensing ports are on opposite sides of the supply port and when the slide valve is in a neutral position the load sensing ports are in throttling relation to the slide valve motor ports. The load sensing ports are sufficiently closely adjacent the supply port that when in operation when the supply port is partially overlapped by one of the motor ports one of the load ports on the opposite side of the supply port is closed by the central section of the slide member.
Inventors
- 👤 Christian Eskildsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:13
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F15B13/0416; F15B13/0417; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/8667; Y10T137/86694; Y10T137/86702; Y10T137/87169; Y10T137/87177; Y10T137/87185
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
367 words
A hydraulic control valve, comprising, a housing having a cylindrically shaped bore, said housing having pump and tank connections and two servomotor load connections, said bore having a supply orifice, said bore having a pair of metering control orifices on opposite sides of said supply orifice in closely spaced relation thereto, said bore having a pair of inner load control orifices on opposite sides of said metering control orifices, said bore having a pair of outer exhaust orifices on opposite sides of said load control orifices, all of said orifices being in the form of annular grooves, said housing having passage means connecting said supply orifice to said pump connection and passage means connecting said load control orifices to said load connections, said housing having passage means connecting said exhaust orifices to said tank connections, a slide member disposed in said bore and being axially displaceable relative thereto, said slide member having axially inner and outer changeover ports cooperable with said orifices upon movement of said slide member in opposite directions to selectively connect opposite ones of said motor connections to said pump and tank connections, said inner changeover ports being separated by a center section which when said slide member is in a neutral position covers said supply orifice and places said metering orifices in fluid throttling communication with said inner changeover ports, said slide member having two cavities formed by two end walls and a central wall, said inner and outer ports having fluid communication with said cavities with said inner ports being adjacent said central wall and said outer ports being adjacent said end walls, said metering control orifices being sufficiently closely adjacent said supply orifice that when in operation when said supply orifice is partially overlapped by one of said inner ports one of said metering control orifices on the opposite side of said supply orifice is closed by said central section of said slide member, the inner edges of said inner changeover ports partially overlapping both of said metering control orifices when said slide member is in the neutral position, and said housing exhaust orifices having their axially inner edges slightly overlapping said slide member outer changeover ports in the neutral position.
Claim 2
Dependent Claim
367 words
A hydraulic control valve, comprising, a housing having a cylindrically shaped bore, said housing having pump and tank connections and two servomotor load connections, said bore having a supply orifice, said bore having a pair of metering control orifices on opposite sides of said supply orifice in closely spaced relation thereto, said bore having a pair of inner load control orifices on opposite sides of said metering control orifices, said bore having a pair of outer exhaust orifices on opposite sides of said load control orifices, all of said orifices being in the form of annular grooves, said housing having passage means connecting said supply orifice to said pump connection and passage means connecting said load control orifices to said load connections, said housing having passage means connecting said exhaust orifices to said tank connections, a slide member disposed in said bore and being axially displaceable relative thereto, said slide member having axially inner and outer changeover ports cooperable with said orifices upon movement of said slide member in opposite directions to selectively connect opposite ones of said motor connections to said pump and tank connections, said inner changeover ports being separated by a center section which when said slide member is in a neutral position covers said supply orifice and places said metering orifices in fluid throttling communication with said inner changeover ports, said slide member having two cavities formed by two end walls and a central wall, said inner and outer ports having fluid communication with said cavities with said inner ports being adjacent said central wall and said outer ports being adjacent said end walls, said metering control orifices being sufficiently closely adjacent said supply orifice that when in operation when said supply orifice is partially overlapped by one of said inner ports one of said metering control orifices on the opposite side of said supply orifice is closed by said central section of said slide member, the inner edges of said inner changeover ports partially overlapping both of said metering control orifices when said slide member is in the neutral position, and said housing exhaust orifices having their axially inner edges slightly overlapping said slide member outer changeover ports in the neutral position.
Claim 3
Dependent Claim
21 words
A control valve according to claim 1 characterized in that said slide member inner and outer changeover ports are radial bores.
Claim 4
Dependent Claim
35 words
A control valve according to claim 2 characterized in that said radial bores are of equal size with the number of said outer changeover ports being larger than the number of said inner changeover ports.
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) | 1988-10-21 | 1989-04-22 | 1989-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-10-21 | 1993-04-22 | 1993-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-10-21 | 1997-04-22 | 1997-10-22 | $7700.00 | Window Closed / Lapsed |