US3870074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve for controlling a reversible, rotary hydraulic motor
Assignee: Deere and Co
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Filing: 1974-04-26
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Granted: 1975-03-11
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Expires: 1994-04-26
Abstract
Abstract A pilot-operated direction control valve includes first and second valve stems respectively axially shiftably mounted in identical first and second sleeve-lined bores having respective opposite closed and open ends with the open ends being in fluid communication with a fluid reservoir. Each valve bore includes first annular recesses adapted for connection to a source of fluid pressure, and the first and second bores respectively have second annular recesses respectively adapted for connection to first and second work ports of a hydraulic motor. Mounted on each of the valve stems are first and second valve elements respectively of the poppet and spool type, the first valve element acting to control the flow of fluid between the first and second recesses of a respective bore and the second valve element acting to control the flow of fluid between the second recess and the open end of the bore. The first valve elements are respectively slidable in the pair of bores adjacent the closed ends thereof and have metering orifices therein which place the first recesses in fluid communication with the closed ends of the bores. A pair of fluid passages respectively extend substantially axially through the pair of valve stems and connect the closed ends of the bores to the reservoir. A pair of closure members are respectively associated with the pair of fluid passages of the pair of valve stems and normally block the fluid passages to maintain a balanced pressure condition across the first valve elements, the pair of closure members being selectively shiftable to respectively permit flow through the pair of passages to establish pressure drops across the associated first valve elements. This causes a respective first valve element, its associated valve stem and the associated second valve element to be shifted downwardly resulting in the unseating of the first valve element and the movement of the second valve element to a blocking position wherein it prevents flow between the second recess and open end of the associated bore.
Inventors
- 👤 Paul Edmund Hanser
- 👤 William Lee Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:38
CPC Classifications
F; F15; F15B; F15B13/00; F15B13/02; F15B13/04; F16; F16K; F16K11/00; F16K11/10; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86574; Y10T137/86582; Y10T137/8659; Y10T137/87169; Y10T137/87193; Y10T137/87209
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
284 words
A valve for controlling the flow of fluid to and from first and second work ports of a reversible, rotary hydraulic motor, comprising: a valve body defining similar first and second valve bore means having axially spaced first and second ports and first locations arranged in that order from respective second locations; the first ports of each bore means being adpated for connection to a source of fluid pressure, the second ports of the first and second bore means respectively being adapted for connection to first and second motor work ports and the first locations of each bore means being adapted for connection to a fluiD reservoir; each of said first and second bore means having a valve stem axially shiftably mounted thereon and spaced therefrom to define an annular passage extending at least between the first ports and first locations; first and second valve elements carried by each valve stem in sliding engagement with a respective bore means at respective locations between the first and second ports and between the second ports and first locations thereof; each of said valve stems being shiftable in a respective bore means between a neutral position wherein the first valve element on the valve stem is engaged with a first valve surface means of the respective bore means to block fluid communication between the first and second ports while the second valve element means is spaced from second valve surface means of the respective bore means to permit fluid communication between the second port and first location, and an actuated condition wherein the first valve element is unseated from said first valve surface means and said second valve element is seated with the second valve surface means.
Claim 2
Dependent Claim
284 words
A valve for controlling the flow of fluid to and from first and second work ports of a reversible, rotary hydraulic motor, comprising: a valve body defining similar first and second valve bore means having axially spaced first and second ports and first locations arranged in that order from respective second locations; the first ports of each bore means being adpated for connection to a source of fluid pressure, the second ports of the first and second bore means respectively being adapted for connection to first and second motor work ports and the first locations of each bore means being adapted for connection to a fluiD reservoir; each of said first and second bore means having a valve stem axially shiftably mounted thereon and spaced therefrom to define an annular passage extending at least between the first ports and first locations; first and second valve elements carried by each valve stem in sliding engagement with a respective bore means at respective locations between the first and second ports and between the second ports and first locations thereof; each of said valve stems being shiftable in a respective bore means between a neutral position wherein the first valve element on the valve stem is engaged with a first valve surface means of the respective bore means to block fluid communication between the first and second ports while the second valve element means is spaced from second valve surface means of the respective bore means to permit fluid communication between the second port and first location, and an actuated condition wherein the first valve element is unseated from said first valve surface means and said second valve element is seated with the second valve surface means.
Claim 3
Dependent Claim
284 words
A valve for controlling the flow of fluid to and from first and second work ports of a reversible, rotary hydraulic motor, comprising: a valve body defining similar first and second valve bore means having axially spaced first and second ports and first locations arranged in that order from respective second locations; the first ports of each bore means being adpated for connection to a source of fluid pressure, the second ports of the first and second bore means respectively being adapted for connection to first and second motor work ports and the first locations of each bore means being adapted for connection to a fluiD reservoir; each of said first and second bore means having a valve stem axially shiftably mounted thereon and spaced therefrom to define an annular passage extending at least between the first ports and first locations; first and second valve elements carried by each valve stem in sliding engagement with a respective bore means at respective locations between the first and second ports and between the second ports and first locations thereof; each of said valve stems being shiftable in a respective bore means between a neutral position wherein the first valve element on the valve stem is engaged with a first valve surface means of the respective bore means to block fluid communication between the first and second ports while the second valve element means is spaced from second valve surface means of the respective bore means to permit fluid communication between the second port and first location, and an actuated condition wherein the first valve element is unseated from said first valve surface means and said second valve element is seated with the second valve surface means.
Claim 4
Dependent Claim
284 words
A valve for controlling the flow of fluid to and from first and second work ports of a reversible, rotary hydraulic motor, comprising: a valve body defining similar first and second valve bore means having axially spaced first and second ports and first locations arranged in that order from respective second locations; the first ports of each bore means being adpated for connection to a source of fluid pressure, the second ports of the first and second bore means respectively being adapted for connection to first and second motor work ports and the first locations of each bore means being adapted for connection to a fluiD reservoir; each of said first and second bore means having a valve stem axially shiftably mounted thereon and spaced therefrom to define an annular passage extending at least between the first ports and first locations; first and second valve elements carried by each valve stem in sliding engagement with a respective bore means at respective locations between the first and second ports and between the second ports and first locations thereof; each of said valve stems being shiftable in a respective bore means between a neutral position wherein the first valve element on the valve stem is engaged with a first valve surface means of the respective bore means to block fluid communication between the first and second ports while the second valve element means is spaced from second valve surface means of the respective bore means to permit fluid communication between the second port and first location, and an actuated condition wherein the first valve element is unseated from said first valve surface means and said second valve element is seated with the second valve surface means.
Claim 5
Dependent Claim
144 words
The valve defined in claim 1 wherein each of the first and second valve bore means is larger in diameter at its first port and first locations than at a central section thereof which cooperates with a respective valve stem to form said annular passage; the first and second valve elements carried by a respective valve stem each being slidably mounted in the central section of a respective bore means and including metering groove means located such that when the valve stem is in its neutral position the metering groove means of the first and second valve elements are respectively located entirely in the central section of the bore means and when the valve stem is in its actuated position the metering grooves of the first and second valve elements are respectively located partially and entirely in the central section of the bore means.
Claim 6
Dependent Claim
80 words
The valve defined in claim 1 wherein each of the first and second valve bore means includes a reduced in diameter central section extending between the first port and first location thereof and includes a valve seat facing axially in the direction of said second location at a location at one end of the central section between the first port and second location; and each of said first valve elements including poppet surface means engageable with a respective valve seat.
Claim 7
Dependent Claim
27 words
The valve defined in claim 3 wherein each of the second valve elements include spool surfaces engageable with the central section of a respective valve bore means.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |