Piston pump

US6093003A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Manfred Hauser · Schwieberdingen, DE
• Ernst-Dieter Schaefer · Neckartenzlingen, DE
• Wolfgang Schuller · Cleebronn, DE
• Erwin Sinnl · Meimsheim, DE
• Peter Lang · Gelnhausen, DE

Key dates

• Filing date: Mar 23, 1998
• Grant date: Jul 25, 2000
• Expiry date: Mar 23, 2018

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B53/14
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a piston pump with a piston received axially displaceably in a pump bore. To improve the aspiration performance of the piston pump. A cuff with a U-shaped annular cross section is provided, the cuff is inserted into the pump bore surrounding the piston, an outer lip forms a diaphragm, which rests against a wall of the pump bore and is acted upon on its outside with ambient pressure through a venting bore. The cuff is part of a fluid storage element, which makes an additional fluid volume available to the piston pump. The diaphragm acted upon by ambient pressure creates a pumping effect, if a fluid pressure in the fluid storage element drops below ambient pressure in an intake stroke of the piston.