Pendular piston pump having a cup-shaped sealing element

US4540352A · kind A · utility

Inventor

• Erich Becker · Springe, DE

Key dates

• Filing date: Sep 9, 1983
• Grant date: Sep 10, 1985
• Expiry date: Sep 9, 2003

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F04B53/143
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A pump comprises a housing member bounding an elongated cylinder bore, a piston member received in the cylinder bore for reciprocation substantially longitudinally thereof, a drive for the piston member, and a sealing arrangement between the piston member and the housing member. The sealing arrangement includes at least one sealing element having a radial supporting section and at least one lip section sealingly contacting the housing member. The wall thickness of the supporting section exceeds that of the lip section. The sealing arrangement may further include another lip section pointing in the opposite direction counter to that of the one lip section, either provided integrally on the same sealing element or separately on a discrete second sealing element assembled with the initially mentioned sealing element to form the sealing arrangement. When the piston member carries out a pendular movement, the cross section or diameter of the cylinder bore is reduced toward and in the axially central region thereof as compared with the diameter at the axial ends of the bore, to reduce the width of the radial gap which the sealing arrangement has to bridge.