Reciprocating piston pump with radial cylinders based by a wire hoop spring against an eccentric shaft

US5897302A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Heinz Siegel · Stuttgart, DE
• Ernst-Dieter Schaefer · Neckartenzlingen, DE
• Guenter Krenz · Steinheim, DE
• Dirk Merbold · Eppingen, DE

Key dates

• Filing date: Oct 2, 1996
• Grant date: Apr 27, 1999
• Expiry date: Oct 2, 2016

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B1/0426
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention is based on a reciprocating piston pump having two radial pistons disposed symmetrically to one another, which are drivable to a reciprocating motion by an eccentric disposed between them and are held in contact with the eccentric by a hoop spring that engages the pistons. For ease of installation, the invention proposes embodying the hoop spring as a bent wire part, with two open, hooklike eyelets on their ends, which ends are inserted into annular grooves of the pistons and enter into a snap connection with them in order to hold the pistons tightly against the eccentric.