CUP OF A MASTER CYLINDER, ADVANTAGEOUSLY A TANDEM MASTER CYLINDER AND TANDEM MASTER CYLINDER PROVIDED WITH SUCH CUPS

摘要

The cup for a master cylinder coming into contact with its primary piston or its secondary piston and subjected to the pressure of the brake fluid of the primary chamber and of the secondary chamber. The cup (60) has two large grooves (622, 624) bordered: by a rib (627) between the heel (621) and the first groove (622), by a rib (623) between the first groove (622) and the second groove (624), by a rib (625) between the second groove (624) and the small grooves (626), these ribs (627, 623, 625) being in protrusion (DS) relative to the cylindrical surface (D) of the heel (621) in the mounted position of the cup (50) in order to separate the heel (620) from the surface of the piston (30) and form, between the heel (620) and the surface of the piston (30), a gap (621) with a film of brake fluid (628) . Master cylinder notably a tandem master cylinder fitted with such cups. - Figure 5 -