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

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).