Disc brake having a latch for locking the conversion cartridge by means of a latch

摘要

A disc brake comprising a floating stirrup and a brake piston controlled via a motion conversion cartridge (200) comprising a rear part pressed against the bottom of the stirrup and a control shaft passing through the bottom. The front part of the cartridge is pressed against the brake piston. It comprises a piston (240) provided with a plate (242) cooperating with the plate (212) of the control shaft (210) with the interposition of balls cooperating with tracks in the form of ramps for transforming the relative rotational motion of the plate (212) relative to the other (242) into a translational motion of the piston (240). The cartridge (200) is held in place in its housing (113) by a cage (260) attached elastically to the wall of the housing. The plate of the piston (240) comprises longitudinal grooves (243) receiving the branches (233) of a lock (230) which is elsewhere blocked in rotation in the housing of the stirrup while leaving the conversion piston (240) free in translation.

主权项

1. A disc brake comprising a floating stirrup (100) straddling the brake disc (2) bearing a fixed shoe (3) and forming a cylinder (110) housing a piston (5) bearing a mobile shoe (4) for clamping the brake disc,
the piston (5) being controlled by an hydraulic circuit and by a parking brake system via a motion conversion cartridge (200) transforming a pivoting motion of a pivoting lever (120) linked to a parking brake, borne by the stirrup (100), into a translational motion for pushing the brake piston (5), the cylinder (110) having a front part housing the brake piston (5) and a rear part forming a housing (113) and receiving the conversion cartridge (200),
the cartridge (200) passing, in a seal-tight manner, through an axial orifice (115) in a bottom (114) of the housing (113) of the cylinder (110) to link a control shaft (210) to the pivoting lever (120) of the parking brake, characterized in that A) the conversion cartridge (200) comprises:
a rear part pressed against the bottom (114) of the housing (113) of the cylinder (110) and consisting of:
a rotation-blocking lock (230) in the form of a ring (231) pressed around the axial orifice (115) of the bottom (114) of the housing (113), and bearing at least one locking branch (233), that extends forward parallel to the axis, and a control shaft (210) linked to the pivoting lever (120) of the parking brake, the control shaft (210) including a sleeve (211) passing through the ring (231), and a first plate (212) coming in front of the ring (231) in the perimeter defined by the locking branch (233) of the lock, a front face of the first plate (212) comprising ramps,a front part pressed against the brake piston (5), mobile in translation relative to the cylinder (110) but blocked in rotation, and consisting of:
a conversion piston (240) including a second plate (242) intended to cooperate with the first plate (212) of the control shaft (210) with the interposition of mobile balls in ramps of the first and second plates (212, 242) to transform the relative rotational motion of the first and second plates (212, 242) into a translational motion of the conversion piston (240) to act on the brake piston (5), and
the edge of the second plate (242) comprises at least one rotation-locking axial groove (243) for receiving the corresponding locking branch (233) of the lock (230),a cage (260) for retaining the conversion piston (240) in the cylinder (110) via a clip (201) and a return spring (250) interposed between the cage and the conversion piston (240), acting against the translational motion generated by the plates (212, 242) and the balls, B) the rear part of the cylinder (110) that forms the housing (113) and receives the conversion cartridge (200) includes at least one longitudinal groove (119) that receives the locking branch (233) of the lock (230), wherein the locking branch (233) also engages the at least one rotation-locking axial groove (243) of the second plate (242).