Brakes – With condition indicator – Electrical
Patent
1978-06-28
1980-02-05
Halvosa, George E. A.
Brakes
With condition indicator
Electrical
116208, 188 723, 192 30W, F16D 6602
Patent
active
041868226
ABSTRACT:
The disc brake disclosed is of the type used for heavy equipment, including off-the-road vehicles. It is oil cooled, with the disc pack being enclosed in a housing. In brakes of this type which are currently on the market, the wear of the disc pack can be checked only by disassembly of the brake assembly. The disclosure shows an arrangement wherein pack wear can be checked without requiring such disassembly. The bosses in which piston retracting mechanisms are provided are convenient for such purposes. One or more of these bosses is provided with a tapped access hole after having the boss end surface machined to a smooth finish. When the brake disc pack is new, the service brake piston and the parking brake release piston cavities are pressurized, causing the parking brake piston to back off completely. The service brake piston squeezes the disc pack against the parking brake piston and pulls the service brake piston return spring guide pins with it. The distance between the headed end of the guide pin and the outside boss machined surface is measured precisely. The measurement is then stamped on the machined surface for future reference and the tapped hole is plugged. To measure wear at any time thereafter the plug is removed, the pressure chambers pressurized and the distance again measured. This measured distance is compared with the measurement previously stamped on the housing. If the difference between the measurements is within the specified wear limit, the disc brake pack need not be replaced. If the difference between the measurements exceeds the specified wear limit, new disc plates are required.
REFERENCES:
patent: 1948190 (1934-02-01), Shelor
patent: 3018852 (1962-01-01), Stanton
patent: 3301359 (1967-01-01), Cole et al.
patent: 3533491 (1970-10-01), Svenson
patent: 3768603 (1973-10-01), Hoffman
patent: 3983964 (1976-10-01), Beals et al.
Khuntia Natabara
Rader Charles W.
General Motors Corporation
Halvosa George E. A.
McGraw D. D.
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