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AssigneeDanfoss Power Solutions ApS
InventorsPoul Ennemark, Abdul Karim Rahimzai, Nils E. Sevelsted
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A fluid controller (1), in particular as part of a hydraulic steering unit, is described, said controller (1) comprising a housing (2) having a supply port arrangement, a sleeve (4) arranged rotatably in a bore of the housing (2), a spool (3) arranged rotatably in the sleeve (4), and a measuring motor, wherein the measuring motor comprises a plurality of working chambers, each working chamber being connected to the bore, wherein the sleeve (4) comprises a commutation geometry (7) having a number of pairs of commutation grooves (12, 13) and controlling together with a housing geometry (5) of the housing (2) a flow of hydraulic fluid into and out of the working chambers and the spool (3) comprises a spool geometry controlling together with a valve geometry of the sleeve (4) a flow of hydraulic fluid between the supply port arrangement and the commutation geometry. Such a fluid controller should have a stable control behaviour. To this end at least one of the commutation grooves (12, 13) comprise a closed bottom and at least one of the commutation grooves (12, 13) comprise a throughgoing opening (10, 11) forming part of the valve geometry.
A fluid controller comprising a housing having a supply port arrangement, a sleeve arranged rotatably in a bore of the housing, a spool arranged rotatably in the sleeve, and a measuring motor, wherein the measuring motor comprises a plurality of working chambers, each working chamber being connected to the bore, wherein the sleeve comprises a commutation geometry having a number of pairs of commutation grooves and controlling together with a housing geometry of the housing a flow of hydraulic fluid into and out of the working chambers and the spool comprises a spool geometry controlling together with a valve geometry of the sleeve a flow of hydraulic fluid between the supply port arrangement and the commutation geometry, wherein at least one of the commutation grooves comprise a closed bottom and at least one of the commutation grooves comprise a throughgoing opening forming part of the valve geometry, wherein the commutation geometry is connected to a circumferential groove running in a circumferential direction, and wherein the circumferential groove is fluidly connected to the throughgoing opening through the at least one of the commutation grooves comprising the throughgoing opening.
A hydraulic steering unit comprising a fluid controller, the fluid controller comprising a housing having a supply port arrangement, a sleeve arranged rotatably in a bore of the housing, a spool arranged rotatably in the sleeve, and a measuring motor, wherein the measuring motor comprises a plurality of working chambers, each working chamber being connected to the bore, wherein the sleeve comprises a commutation geometry having a number of pairs of commutation grooves and controlling together with a housing geometry of the housing a flow of hydraulic fluid into and out of the working chambers and the spool comprises a spool geometry controlling together with a valve geometry of the sleeve a flow of hydraulic fluid between the supply port arrangement and the commutation geometry, wherein at least one of the commutation grooves comprise a closed bottom and at least one of the commutation grooves comprise a throughgoing opening forming part of the valve geometry, wherein the commutation geometry is connected to a circumferential groove running in a circumferential direction, and wherein the circumferential groove is fluidly connected to the throughgoing opening through the at least one of the commutation grooves comprising the throughgoing opening.
A fluid controller comprising:
Dependencies are inferred from the claim text.