Patent ID: 8353691
Filing Date: 2013-01-15
Classification: B60T,F04B

Abstract:
1. A piston pump for hydraulic energy supply in a motor vehicle comprising: a piston movably arranged in a cylinder within an accommodating member; and a seat carried by the piston, the seat accommodating a sealing element with axial play and with radial elastic preload for the purpose of sealing between the piston and the cylinder and the seat having a structure which generates forces pointing radially towards a piston axis and expanding the sealing element in a radial direction, wherein the structure produces an elastic deformation of the sealing element for an increased and dosed sealing contact pressure between the piston and the cylinder and wherein the seat includes a first seat portion having an essentially cylindrical configuration, a second seat portion having a conical configuration extending radially outward relative to the first seat portion, and a shoulder that is formed between the first seat portion and the second seat portion, and a spring retainer that is biased against the piston by a spring to bear on the shoulder of the seat, said spring retainer being positioned between the first seat portion and the sealing element, wherein the sealing element is positioned against the spring retainer and the second seat portion of the seat.