Patent US3880050A successfully refreshed from Google Patents.
US3880050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for regulating the operation of hydraulic machines
Assignee: Individual
•
Filing: 1973-04-24
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Granted: 1975-04-29
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Expires: 1993-04-24
Abstract
Abstract A servo mechanism for the slide block of a variable delivery radial piston pump, for the tilting plate of an axial piston pump or for analogous regulating members of hydraulic motors has a housing which is bolted to the body of a hydraulic machine and receives a reciprocable piston which is movable in a cylinder of the housing to thereby displace the regulating member of the hydraulic machine when the cylinder receives pressurized fluid. The flow of fluid into and from the cylinder is regulated by a spool-like control member surrounding an axially movable follower plunger which is biased against the piston by a spring. The control member can be moved axially by a pinion and is biased in opposite directions by two helical springs one of which surrounds the follower plunger and the other of which surrounds an axially adjustable stop supporting a retainer which can be biased against the adjacent end face of the control member. The control member is automatically moved to a neutral position corresponding to the neutral position of the regulating member in the hydraulic machine when it is not held against such movement by the pinion. The bias of one of the two helical springs is half the bias of the other helical spring when the control member assumes its neutral position. The control member cannot move back and forth beyond the neutral position except when shifted by the pinion.
Inventors
- 👤 Werner Rometsch
- 👤 Karl Veil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:53
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/12; F04B49/123; F15; F15B; F15B9/00; F15B9/02; F15B9/08; F15B9/10
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
215 words
The combination of a hydraulic machine having a movable regulating member with a servo mechanism which is actuatable to move said regulating member in a predetermined direction, said mechanism comprising a housing having an inlet for pressurized fluid and an outlet including a cylinder; a piston displaceable in said cylinder by pressurized fluid to move said regulating member in said direction; fluid flow controlling means including a control member movable in said housing between two end poritions and a plurality of intermediate positions including a neutral position to thereby control the flow of fluid between said cylinder and said inlet and outlet; first and second resilient means mounted in said housing and acting upon said control member in opposite directions so as to bias said control member in said neutral position with forces of first and second magnitude and to bias said control member in at least some of the other positions thereof; shifting means operable to move said control member; and stop means provided in said housing and being engaged by said control member in said neutral position when said control member is not held against movement to said neutral position by said shifting means, said stop means being adjustable relative to said housing to thereby change said neutral position of said control member.
Claim 2
Dependent Claim
215 words
The combination of a hydraulic machine having a movable regulating member with a servo mechanism which is actuatable to move said regulating member in a predetermined direction, said mechanism comprising a housing having an inlet for pressurized fluid and an outlet including a cylinder; a piston displaceable in said cylinder by pressurized fluid to move said regulating member in said direction; fluid flow controlling means including a control member movable in said housing between two end poritions and a plurality of intermediate positions including a neutral position to thereby control the flow of fluid between said cylinder and said inlet and outlet; first and second resilient means mounted in said housing and acting upon said control member in opposite directions so as to bias said control member in said neutral position with forces of first and second magnitude and to bias said control member in at least some of the other positions thereof; shifting means operable to move said control member; and stop means provided in said housing and being engaged by said control member in said neutral position when said control member is not held against movement to said neutral position by said shifting means, said stop means being adjustable relative to said housing to thereby change said neutral position of said control member.
Claim 3
Dependent Claim
53 words
The combination of claim 1, wherein said first resilient means biases said control member from one of said end positions with a first predetermined force and said second resilient means biases said control member from the other of said end positions with a second predetermined force which equals or approximates said first force.
Claim 4
Dependent Claim
220 words
The combination of a hydraulic machine having a movable regulating member with a servo mechanism which is actuatable to move said regulating member in a predetermined direction, said mechanism comprising a housing having an inlet for pressurized fluid and an outlet and including a cylinder; a piston displaceable in said cylinder by pressurized fluid to move said regulating member in said direction; fluid flow controlling means including a control member movable in said housing between two end positions and a plurality of intermediate positions including a neutral position to thereby control the flow of fluid between said cylinder and said inlet and outlet; first and second resilient means mounted in said housing and acting upon said control member in opposite directions so as to bias said control member in said neutral position with forces of first and second magnitude and to bias said control member in at least some of the other positions thereof; shifting means operable to move said control member and comprising a toothed rack provided on said control member and A gear meshing with said rack and rotatably mounted in said housing; and stop means provided in said housing and being engaged by said control member in said neutral position when said control member is not held against movement to said neutral position by said shifting means.
Claim 5
Dependent Claim
220 words
The combination of a hydraulic machine having a movable regulating member with a servo mechanism which is actuatable to move said regulating member in a predetermined direction, said mechanism comprising a housing having an inlet for pressurized fluid and an outlet and including a cylinder; a piston displaceable in said cylinder by pressurized fluid to move said regulating member in said direction; fluid flow controlling means including a control member movable in said housing between two end positions and a plurality of intermediate positions including a neutral position to thereby control the flow of fluid between said cylinder and said inlet and outlet; first and second resilient means mounted in said housing and acting upon said control member in opposite directions so as to bias said control member in said neutral position with forces of first and second magnitude and to bias said control member in at least some of the other positions thereof; shifting means operable to move said control member and comprising a toothed rack provided on said control member and A gear meshing with said rack and rotatably mounted in said housing; and stop means provided in said housing and being engaged by said control member in said neutral position when said control member is not held against movement to said neutral position by said shifting means.
Claim 6
Dependent Claim
228 words
The combination of a hydraulic machine having a movable regulating member with a servo mechanism which is actuatable to move said regulating member in a predetermined direction, said mechanism comprising a housing having a bore and an inlet for pressurized fluid and an outlet, both communicating with said bore, and said housing including a cylinder; a piston displaceable in said cylinder by pressurized fluid to move said regulating member in said direction; fluid flow controlling means including a control member having an axial bore and being reciprocable in said bore of said housing between two end positions and a plurality of intermediate positions including a neutral position, and a follower plunger in said axial bore of said control member to thereby control the flow of fluid between said cylinder and said inlet and outlet; first and second resilient means mounted in said housing and acting upon said control member in opposite directions so as to bias said control member in said neutral position with forces of first and second magnitude and to bias said control member in at least some of the other positions thereof; shifting means operable to move said control member; and stop means provided in said housing and being engaged by said control member in said neutral position when said control member is not held against movement to said neutral position by said shifting means.
Claim 7
Dependent Claim
228 words
The combination of a hydraulic machine having a movable regulating member with a servo mechanism which is actuatable to move said regulating member in a predetermined direction, said mechanism comprising a housing having a bore and an inlet for pressurized fluid and an outlet, both communicating with said bore, and said housing including a cylinder; a piston displaceable in said cylinder by pressurized fluid to move said regulating member in said direction; fluid flow controlling means including a control member having an axial bore and being reciprocable in said bore of said housing between two end positions and a plurality of intermediate positions including a neutral position, and a follower plunger in said axial bore of said control member to thereby control the flow of fluid between said cylinder and said inlet and outlet; first and second resilient means mounted in said housing and acting upon said control member in opposite directions so as to bias said control member in said neutral position with forces of first and second magnitude and to bias said control member in at least some of the other positions thereof; shifting means operable to move said control member; and stop means provided in said housing and being engaged by said control member in said neutral position when said control member is not held against movement to said neutral position by said shifting means.
Claim 8
Dependent Claim
18 words
The combination of claim 4 further comprising spring means arranged to urge said follower plunger against said piston.
Claim 9
Dependent Claim
17 words
The combination of claim 4, wherein one of said resilient means is guided by said follower plunger.
Claim 10
Dependent Claim
103 words
The combination of claim 4, wherein said stop means includes a carrier which extends into the bore of said housing and includes an abutment, and a motion transmitting member movable along said carrier toward and from engagement with said abutment and bearing against one end of said control member in said neutral position as well as when said control member moves beyond said neutral position toward one of said end positions thereof, one of said resilient means being arranged to bias said motion transmitting member toward said abutment, said motion transmitting member engaging said abutment in said neutral position of said control member.
Claim 11
Dependent Claim
31 words
The combination of claim 7, further comprising a sealing member for one end of the bore in said housing, said sealing member having threads mating with complementary threads of said carrier.
Claim 12
Dependent Claim
220 words
The combination of a hydraulic machine having a movable regulating member with a servo mechanism which is actuatable to move said regulating member in a predetermined direction, said mechanism comprising a housing having an inlet for pressurized fluid and an outlet and including a cylinder; a piston displaceable in said cylinder pressurized fluid to move said regulating member in said direction; fluid flow control means including a control member movable in said housing between two end positions and a plurality of intermediate positions including a neutral position to thereby control the flow of fluid between said cylinder and said inlet and outlet; first and second resilient means mounted in said housing and acting upon said control member in opposite directions so as to bias said control member in said neutral position with forces of first and second magnitude and to bias said control member in at least some of the other positions thereof, the magnitude of one of said forces in said neutral position of said control member being about twice the magnitude of the other force; shifting means operable to move said control member; and stop means provided in said housing and being engaged by said control member in said neutral position when said control member is nOt held against movement to said neutral position by said shifting means.
Claim 13
Dependent Claim
220 words
The combination of a hydraulic machine having a movable regulating member with a servo mechanism which is actuatable to move said regulating member in a predetermined direction, said mechanism comprising a housing having an inlet for pressurized fluid and an outlet and including a cylinder; a piston displaceable in said cylinder pressurized fluid to move said regulating member in said direction; fluid flow control means including a control member movable in said housing between two end positions and a plurality of intermediate positions including a neutral position to thereby control the flow of fluid between said cylinder and said inlet and outlet; first and second resilient means mounted in said housing and acting upon said control member in opposite directions so as to bias said control member in said neutral position with forces of first and second magnitude and to bias said control member in at least some of the other positions thereof, the magnitude of one of said forces in said neutral position of said control member being about twice the magnitude of the other force; shifting means operable to move said control member; and stop means provided in said housing and being engaged by said control member in said neutral position when said control member is nOt held against movement to said neutral position by said shifting means.
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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) | 1978-04-28 | 1978-10-28 | 1979-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-28 | 1982-10-28 | 1983-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-28 | 1986-10-28 | 1987-04-29 | $7700.00 | Window Closed / Lapsed |