Primary piston for a tandem master cylinder and tandem master cylinder equipped with such a primary piston

US9643579B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Marc Rodriguez · Jouy-le-Moutier, FR
• Olivier Bernadat · Dozulé, FR
• Laurent Lhuillier · Le Blanc-Mesnil, FR
• Marc Noblet · Paris, FR
• Julien Gateau · Gentilly, FR
• Daniel Grech · Persan, FR
• Carole Charpentier · Montmorency, FR

Key dates

• Filing date: Dec 1, 2011
• Grant date: May 9, 2017
• Expiry date: Oct 11, 2033

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T8/38
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A primary piston composed of a skirt and an intermediate back wall having a rear face receiving the servobrake thrust rod and a forward face for the telescoping rod and the spring pushing the secondary piston. The front of the skirt has longitudinal grooves open in front and closed in the rear. The thickness of the skirt beneath the grooves and the part of the skirt between two successive grooves in the peripheral direction form a front face enabling the principal piston to push the secondary piston. The principal piston is made of a single piece of plastic material.