Friction-pad wear-limit warning device for disc brakes

Details Friction-pad wear-limit warning device for disc brakes Friction-pad wear-limit warning device for disc brakes

1982-04-14

1985-02-12

Stoner, Jr., Bruce H.

Brakes

With condition indicator

Electrical

116208, F16D 6300

Patent

active

044985592

ABSTRACT:
A wear-limit warning device for a vehicle disc brake, warning the vehicle driver that a maximum permissible wear limit is reached on the friction pad or pads. The warning device comprises a projection protruding sideways from the end face of a backing plate of each friction pad, and a warning member made from a spring sheet material. The warning member consists of a mounting leg portion, a contact portion and a spring portion connecting the leg and contact portions. The leg portion having a pair of legs which grip therebetween an end portion of the backing plate and the protruding projection thereby attaching the warning member to the backing plate and preventing the same from being shifted out of position during service. The contact portion extends along the end face of the projection until its end reaches a permissible wear limit level of the friction member of the friction pad, and is pressed against the end face of the projection with a resilient force of the spring portion. When the wear limit is reached, the end of the contact portion comes into contact with the friction surface of the rotating brake disc rotor and the contact portion vibrates with oscillatory movements of the end in abutment on the friction surface due to stick-slip, thereby generating a warning sound.

REFERENCES:
patent: 3141524 (1964-07-01), Mishler
patent: 3958666 (1976-05-01), Hooten et al.
patent: 4037689 (1977-07-01), Maehara

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