US 12,012,160 B2
Fluid controller, in particular as part of a hydraulic steering unit
Poul Ennemark, Sønderborg (DK); Abdul Karim Rahimzai, Sønderborg (DK); and Nils E. Sevelsted, Sønderborg (DK)
Assigned to DANFOSS POWER SOLUTIONS APS, Nordborg (DK)
Filed by Danfoss Power Solutions ApS, Nordborg (DK)
Filed on Mar. 3, 2021, as Appl. No. 17/191,186.
Claims priority of application No. 102020106437.3 (DE), filed on Mar. 10, 2020.
Prior Publication US 2021/0284227 A1, Sep. 16, 2021
Int. Cl. B62D 5/065 (2006.01); B62D 5/087 (2006.01); B62D 5/12 (2006.01)
CPC B62D 5/065 (2013.01) [B62D 5/087 (2013.01); B62D 5/12 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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.