Hydraulic pump and piston for such a hydraulic pump
AssigneeHydac Drive Center GmbH
InventorBernd Wykydal
Life of this patent
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Abstract
A hydraulic pump, in particular an adjustable axial piston pump, has at least one piston (22) movable in a reciprocating manner in a longitudinal direction within a pump housing during operation of the hydraulic pump. The piston (22) has a link head (24), a piston top (54) opposite the link head (24), and at least one hollow chamber (60) surrounded at least partially by a piston housing (62) that substantially or completely terminates each hollow chamber (60) towards the outside. A piston (22) for such hydraulic pump is also provided.
Claims19
A hydraulic axial piston pump, comprising:
- a pump housing;
- at least one piston movable in opposite axial directions along a longitudinal axis of said piston inside said pump housing during operation of the pump, said piston having a link head, having a piston base opposite said link head, having a through-hole extending through said link head and said piston base and having at least one hollow chamber therein, said hollow chamber being at least partially encompassed by a piston housing substantially or entirely closing said hollow chamber to an outside of said piston, said hollow chamber being closed by a lid connected to said piston housing;
- and
- an equalizer in said piston housing or said lid connecting said hollow chamber to an environment outside of said piston chamber in a media conducting or fluid communication manner at said piston base to prevent excess pressure in said hollow chamber during joining of said lid to said piston housing.
A piston for a hydraulic axial piston pump, the piston comprising:
- a piston housing;
- a link head at one end of said piston housing;
- a piston base at an opposite end of said piston housing;
- a through-hole extending through said link head and said piston base;
- at least one hollow chamber in said piston housing, said hollow chamber being at least partially encompassed by a piston housing substantially or entirely closing said hollow chamber to an outside of said piston housing, said hollow chamber being closed by a lid connected to said piston housing;
- and
- an equalizer in said piston housing or said lid connecting said hollow chamber to an environment outside of said piston chamber in a media conducting or fluid communication manner at the piston base to prevent excess pressure in said hollow chamber during joining of said lid to said piston housing.
Dependencies are inferred from the claim text.