Piston pump for use in motor vehicle, has hub with structure that produces force directed to piston axis, where structure causes elastic deformation of body for strengthened and dosed seal contact pressure between piston and cylinder

摘要

The pump has a piston (16) movably arranged in a level-borehole of a retainer body (3), where the piston is formed with a tube section and supports a valve hub for a non-return valve (32). The piston supports the hub (60) for a flexible seal body (26), and a reset spring (41) is provided in a cylinder. The hub for the body has a structure that produces a force that is directed radially to a piston axis and radially expands the seal body, where the structure causes an elastic deformation of the sealing body for strengthened and dosed seal contact pressure between the piston and the cylinder.