Drive unit for a wiper system of motor vehicles and method of manufacturing same

US5142939A · kind A · utility

Assignee

• SWF Auto-Electric GmbH · DE

Inventors

• Kurt Bauer · Bietigheim-Bissingen, DE
• Wilhelm Dorr · Bietigheim-Bissingen, DE
• Reinhard Edele · Bietigheim-Bissingen, DE
• Werner Pfitzenmaier · Besigheim, DE
• Christian Roth · Bietigheim-Bissingen, DE
• Eckhardt Schmid · Bietigheim-Bissingen, DE

Key dates

• Filing date: Feb 5, 1992
• Grant date: Sep 1, 1992
• Expiry date: Feb 5, 2012

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T403/49
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A connection and two step method of manufacturing is disclosed for a drive unit for a wiper arm system which consists of a wiper shaft mounted in a bore through a crank arm. The wiper shaft is formed with a groove disposed within the thickness of the crank arm and material from one surface of the crank arm is displaced to form an annular recess which causes crank arm material adjacent the groove to be radially displaced into a groove formed in the wiper shaft to form an axial holding element. The radial distance R1 of the recess from the crank arm bore is substantially equal to the axial distance A1 of the groove below the one crank arm surface to facilitate the extruding process. Knurled areas on the shaft on either side of the groove are press fit into the crank arm bore as a first step in assembling the shaft to the crank arm, bringing a flange into abutment against the other surface of the crank arm.