Piston pump for delivering a fluid, and associated brake system

摘要

A piston pump includes a piston assembly having at least one cross bore and a longitudinal bore corresponding to the at least one transverse bore, a cylinder, into which the piston assembly is guided in a longitudinally movable manner, and an inlet valve with a cage element, in which an inlet valve spring and an inlet valve sealing element are disposed, and a corresponding inlet valve seat, which is disposed on the piston assembly. Fluid flows through the longitudinal bore into a compression chamber via the inlet valve. A return spring is disposed in the compression chamber. The cage element has a resilient high-pressure sealing element that is configured to receive radially acting power components, and to effect a seal against a cylinder wall via a radial sealing surface, and in order to effect an axial seal against the piston assembly via an axial sealing surface.

主权项

1. A piston pump, comprising:
a piston assembly, which includes a piston assembly wall, at least one transverse bore, and one longitudinal bore corresponding to the at least one transverse bore; a cylinder, including a cylinder wall in which the piston assembly is guided longitudinally movably; and an inlet valve, which includes a cage element in which an inlet valve spring and an inlet valve sealing element are disposed, and which includes a corresponding inlet valve seat, which is disposed on the piston assembly, wherein the inlet valve sealing element is configured to be pressed sealingly by a spring force of the inlet valve spring into the corresponding inlet valve seat in order to close the longitudinal bore; and via the at least one transverse bore disposed in the piston assembly, fluid can be aspirated that can be conducted through the longitudinal bore via the inlet valve into a compression chamber in which a restoring spring for the piston assembly is disposed, and wherein the cage element has an elastic high-pressure sealing element which absorbs radially acting force components and which seals off radially against the cylinder wall via a radial seal, the radial seal including:
a first radial sealing face having a full radial outside diameter including a substantially planar surface extending longitudinally along the entire longitudinal extent of the sealing element and configured for full surface contact with the cylinder wall along the entire longitudinal extent of the sealing element, anda second radial sealing face having a full inside diameter including a substantially planar surface extending longitudinally and configured for full surface contact with the piston assembly wall, the high-pressure sealing element further including:
an axial sealing face extending radially inward from said radial seal which seals off axially against the piston assembly, anda radial contact region disposed toward the cylinder wall, the radial contact region being configured for receiving and centering an upper end winding of the restoring spring; wherein said second radial sealing face extends longitudinally from said axial sealing face toward said piston assembly, wherein said first radial sealing face extends longitudinally beyond said second radial sealing face, and wherein the radial seal is configured to and formed of a material adapted to be widened radially between the first radial sealing face and the second radial sealing face, so that the first radial sealing face is in full surface contact with the cylinder wall and the second radial sealing face is in full surface contact with said piston assembly wall, at least partly by a longitudinal pressure acting on the high-pressure sealing element resulting from contact of the high-pressure sealing element with the piston assembly due to spring force of the restoring spring.