Patent US3584985A successfully refreshed from Google Patents.
US3584985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic control equipment particularly for steering systems
Assignee: Danfoss AS
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Filing: 1969-05-13
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Granted: 1971-06-15
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Expires: 1989-05-13
Abstract
Abstract The invention relates to a hydrostatic control unit for vehicle steering systems or the like. The unit has a gerotor-type metering motor, inlet and outlet ports and two motor ports which are connectable to a piston and cylinder-type motor of the kind used for actuating a vehicle steering linkage. The unit has changeover valve means having a neutral position and left and right operating positions relates to the two directions of rotation of the metering motor. The metering motor comprises ring and star members with the ring member being capable of only rotational movement and the star member being capable of only orbital movement. Commutator-type valve means is provided which has the form of a disc and is connected to the ring member for rotation therewith.
Inventors
- 👤 Johannes Vagn Baatrup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:33
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/06; B62D5/09; B62D5/093; B62D5/097; F; F15; F15B; F15B9/00; F15B9/02; F15B9/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
125 words
A hydrostatic control unit for steering systems or the like comprising, a casing, said casing having inlet and outlet ports and two motor ports, a metering motor having an outer toothed ring and an inner toothed wheel with one fewer teeth, means for mounting said ring for solely rotatable movement relative to said casing and means for mounting said wheel for solely orbital movement relative to said casing, fluid passages in said casing, a commutator valve, means attaching said commutator valve to said ring for rotation therewith and cooperation with said passages to feed fluid to and exhaust fluid from said motor, and changeover valve means having a neutral position and two operating positions each related to a direction of rotation of said metering motor.
Claim 2
Dependent Claim
125 words
A hydrostatic control unit for steering systems or the like comprising, a casing, said casing having inlet and outlet ports and two motor ports, a metering motor having an outer toothed ring and an inner toothed wheel with one fewer teeth, means for mounting said ring for solely rotatable movement relative to said casing and means for mounting said wheel for solely orbital movement relative to said casing, fluid passages in said casing, a commutator valve, means attaching said commutator valve to said ring for rotation therewith and cooperation with said passages to feed fluid to and exhaust fluid from said motor, and changeover valve means having a neutral position and two operating positions each related to a direction of rotation of said metering motor.
Claim 3
Dependent Claim
25 words
A hydrostatic control unit according to claim 1 wherein said commutator valve is a disc in axial abutting engagement with said ring and said wheel.
Claim 4
Dependent Claim
29 words
A hydrostatic control unit according to claim 2 wherein said changeover valve means includes inner and outer sleeves, means connecting said outer sleeve to said disc for rotation therewith.
Claim 5
Dependent Claim
31 words
A hydrostatic control unit according to claim 3 wherein said casing forms adjacent separate chambers for said metering motor and said sleeves, said disc forming a separating wall between said chambers.
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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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |