F - Mech Eng,Light,Heat,Weapons – 16 – D
Patent
F - Mech Eng,Light,Heat,Weapons
16
D
188/129
F16D 66/02 (2006.01) F16D 55/40 (2006.01)
Patent
CA 1095436
C-2974 DISC BRAKE PACK WEAR INDICATOR Abstract of the Disclosure 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 arrange- ment 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 pres- sure chambers pressurized and the distance again measured. This measured distance is compared with the measurement pre- viously 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.
327358
Khuntia Natabara
Rader Charles W.
General Motors Corporation
Gowling Lafleur Henderson Llp
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