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Hydrostatic Axial Piston Machine

  • US 20190316572A1
  • Filed: 04/08/2019
  • Published: 10/17/2019
  • Est. Priority Date: 04/11/2018
  • Status: Active Grant
First Claim
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1. A swashplate-type hydrostatic axial piston machine, comprising:

  • a housing;

    a connection plate that closes the housing;

    a plurality of working connections formed on the connection plate;

    a drive shaft rotatably mounted in the housing and in the connection plate;

    a swashplate;

    a cylinder drum coupled to the drive shaft in a direction of rotation and including a first end face, a second end face, and a drum neck;

    a plurality of cylinder bores defined in the cylinder drum; and

    a plurality of displacement pistons, each of which is located in an associated one of the plurality of cylinder bores and is movable back and forth in the associated cylinder bore, each displacement piston projecting on the first end face from the cylinder drum and resting against the swashplate;

    a control plate against which the second end face bears;

    a retraction plate configured to remove each displacement piston from the plurality of cylinder bores on one half of a rotation; and

    a retraction ball arranged in front of the first end face surrounding the drum neck and the drive shaft, the retraction plate loaded in a direction of the swashplate via the retraction ball,wherein the retraction ball is sealed against the drum neck of the cylinder drum and against the drive shaft,wherein a retraction ball pressure chamber is defined by a plurality of seals between the retraction ball, the cylinder drum, and the drive shaft, and is configured to be acted upon by a pressure above a housing pressure,wherein the plurality of cylinder bores are fluidically open in respect of the control plate, andwherein the plurality of cylinder bores are configured to be connected fluidically to the plurality of working connections via the control plate.

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