Pressure-medium-traversed piston of a reciprocating piston pump

US5588817A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wilhelm Zirps · Hemmingen, DE
• Wolfgang Schuller · Cleebronn, DE
• Martin Urban · Luton, GB

Key dates

• Filing date: Jul 17, 1995
• Grant date: Dec 31, 1996
• Expiry date: Jul 17, 2015

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/7936
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

This invention is directed to a closing member of an inlet valve of a pressure-medium-traversed piston of a reciprocating piston pump. The closing member is disposed as fully as possible in the piston to minimize the dead air space. The piston has a longitudinal bore in which a stem engages the closing member, which stem emanates from a valve disk. The stem is embraced by an at least approximately frustoconical helical compression spring acting as a closing spring. This is held, with an end segment of smaller diameter, non-twistably against the stem. A shoulder of the longitudinal bore is located on the valve seat side and exhibits at least one cross-sectional alteration for the screw-like action upon the end segment of larger diameter of the closing spring. The closing spring is thus able to be sunk into the longitudinal bore and biased in place. The reciprocating piston pump can be used, for example, for slip-regulated braking systems of motor vehicles.