Swashplate axial piston pump
AssigneeHydromatik GmbH
InventorsLudwig Wagenseil, Manfred Lotter
Life of this patent
Estimating the term…
Abstract
The invention relates to a swash plate axial piston pump having several pistons, the piston heads of which are held in contact with the swash plate by means of a retraction plate, and having a central pressure-regulating valve which is forced against a valve spring by the pressure in the pressure chamber. The object is to provide a way of fixing the retraction plate on the swash plate which is simple and cheap to construct and install. This is achieved by arranging and fixing the valve spring between the valve body and the retraction plate.
Claims13
A swashplate axial piston pump comprising a housing including a suction chamber and a discharge chamber, a pump block extending inside the housing and including a plurality of piston bores, a plurality of pistons supported for reciprocating movement in the piston bores, each piston including a piston head, a swashplate supported in the housing to reciprocate the piston, a retraction plate for holding the piston heads against the swashplate, a pressure-regulating valve assembly in communication with the suction and discharge chambers to conduct fluid therebetween, said valve assembly including a valving body disposed centrally between the pistons to control fluid flow through the valve assembly, and moving to a position opening the pressure-regulating valve assembly when the pressure in the discharge chamber exceeds the pressure in the suction chamber by a predetermined pressure;
- and
- means consisting of a single spring disposed and clamped between the valving body and the retraction plate, and both urging the retraction plate to a position securely holding the piston heads against the swashplate and simultaneously urging the valving body to a position closing the pressure-regulating valve assembly.
Dependencies are inferred from the claim text.