Hydraulic steering unit
AssigneeDanfoss Power Solutions ApS
InventorsMogens Frederiksen, Niels Arbjerg, Poul Ennemark
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Abstract
The invention relates to a hydraulic steering unit (1) including a housing (3), a spool, a sleeve (12) arranged between spool and housing (3), and a measuring motor (14) having a number of working chambers (15), wherein a first commutation geometry (18) and a second commutation geometry (19) are arranged between the sleeve (12) and the housing (3), wherein the commutation geometries (18, 19) are connected to the working chambers (15) of the measuring motor (14) and the housing includes a first direction port (4), a second direction port (5), a pressure port (6), and a return port (7). The object is to have a good steering behavior. To this end one of the commutation geometries (18) is directly connected to the first direction port (4).
Claims12
A hydraulic steering unit comprising:
- a housing,
- a spool,
- a sleeve arranged between spool and housing,
- and a measuring motor having a number of working chambers,
- wherein a first commutation geometry and a second commutation geometry are arranged between the sleeve and the housing,
- wherein the commutation geometries are connected to the working chambers of the measuring motor
- and the housing comprises a first direction port, a second direction port, a pressure port, and a return port,
- wherein a first commutation geometry is directly connected to the first direction port,
- and wherein the first commutation geometry extends between the first direction port and working chamber openings formed in the housing without any orifices located therebetween.
A hydraulic steering unit comprising:
- a housing,
- a spool,
- a sleeve arranged between spool and housing,
- and a measuring motor having a number of working chambers,
- wherein a first commutation geometry and a second commutation geometry are arranged between the sleeve and the housing,
- wherein the commutation geometries are connected to the working chambers of the measuring motor and the housing comprises a first direction port, a second direction port, a pressure port, and a return port,
- wherein a first commutation geometry is directly connected to the first direction port, and
- wherein the second commutation geometry connects the pressure port to the measuring motor when spool and sleeve are rotated relatively to each other in one direction and connects the tank port to the measuring motor when spool and sleeve are rotated relatively to each other in the opposite direction.
Dependencies are inferred from the claim text.