Importance

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Abstract

A disc brake comprising a clamp member which is slidably connected to a torque taking member, with a hydraulic actuator mechanism and an adjuster mechanism being located within the clamp member and a spring arranged to act on the clamp member and adjuster mechanism to provide a parking brake facility. The adjuster mechanism comprises an adjuster nut which is threadedly engaged on an axially movable actuator shaft which acts on a friction pad, the adjuster nut having an annular series of detent teeth formed on two axially and oppositely directed faces. The detent teeth are arranged such that when the teeth on one face of the adjuster nut are fully meshed with the teeth on a part of the adjuster mechanism on which the spring acts, the teeth on the detent collar are engaged with but offset from the teeth on the other face of the adjuster nut. The adjuster nut engages an abutment during normal hydraulic operation of the brake only after the adjuster nut has moved a predetermined axial distance, the adjuster nut being caused to rotate on the actuator shaft only when the adjuster nut has to travel a distance greater than the predetermined distance to apply the brake, the detent teeth on the faces of the adjuster nut then moving over the mated teeth on the detent collar and the part of the adjuster mechanism, the spring biased detent collar causing the adjuster nut to rotate when the brake is released, to a position where the teeth on the other face of the adjuster nut are further meshed with the teeth on the detent collar, subsequent parking brake operation causing the adjuster nut to rotate to a position where the teeth on one face of the adjuster nut are fully meshed with the teeth on one part of the adjuster mechanism.

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First Claim