Disc brake piston cap and disc brake equipped therewith

摘要

Disc brake piston cap (3) interposed between the caliper (1) and the piston (2) to protect the piston (2). The cap (3) has a bulge (351) on the inner fold (35) which is engaged in the groove (22) of the piston (2), and has an overmolded insert (31) fixed to the annular groove (11) of the caliper. The folded cap (3), with the overmolded insert (31), intermediate folds (33, 34) and an outer fold (32), comprises longitudinal ribs (352) on the face of the inner fold (35) to stiffen this fold and allow air to pass from the inside to the outside around the bulge (351) of the inner fold (35), housed in the groove (22).

主权项

1. A disc brake piston cap interposed between a caliper (1) and a piston (2) to protect the piston against attack, this cap being made up of a bellows-style concertina-folded boot having an outer edge and an inner edge to be housed in an annular groove (11) of the caliper (1) at a mouth of a bore (12) accommodating the piston (2), the outer edge of the cap being fixed to the caliper at an outer side (111) of the annular groove (11) and the inner edge of the cap being provided with a bulge housed in a groove (22) of the piston (2),
the piston cap being characterized in that
an inner fold (35) of the cap (3) is situated between the groove (22) of the piston (2) and the inside of the caliper (1), and has longitudinal ribs (352) on a surface of the cap, wherein the longitudinal ribs (352) are pressed against the piston (2) to allow air to pass between the ribs (352) and in that the inner fold (35) is connected by a first inner articulation (342) to a first outwardly facing intermediate fold (34), wherein the first outwardly facing intermediate fold (34) is connected by a first outer articulation (341) to an inwardly facing intermediate fold (33), wherein the inwardly facing intermediate fold (33) is connected by a second inner articulation (331), wherein the second inner articulation (331) is connected to a second outwardly facing outer fold (32), and the second outwardly facing outer fold (32) is connected by a second outer articulation (321) to an overmoulded insert (31), and the first and second inner articulations (331, 342) are equipped with studs (38) to press against the bottom (112) of the annular groove (11) of the caliper while allowing air to pass between the studs, wherein the longitudinal ribs permit air to freely exhaust from the annular groove while the longitudinal ribs contact the surface of the piston.