Abstract: A brake drum for braking a transmission member of a planetary gear change-speed transmission, with a cylinder provided on its outside with a cylindrical brake surface for the engagement of a brake band to engage a speed and on its inside with engaging surfaces for the non-rotatable mounting of clutch lamellae of a clutch operating on the transmission member, and with a drive flange which is coaxial and non-rotatable with respect to the cylinder and which is connected for rotation in unison with the transmission member. The cylinder is constructed double-walled by means of a collar provided with the brake surface while the cylinder section disposed on the inside of the collar is constructed in one piece with the drive flange.

Abstract: A method of manufacturing a brake drum having a plurality of axially spaced, circumferentially extending ribs provided on the exterior surface thereof. The method includes casting molten grey iron into a mold cavity formed by a plurality of axially split external mold segments spaced radially outward from an internal mold member, spacing the radially inward portions of the interfacing lateral edge surfaces of the external mold segments to form a flash base free of white iron metal at the parting line between adjacent external mold segments and, after cooling the molten iron and removing the mold members, grinding away at least a portion of the flash metal formed between the interfacing lateral edge surfaces of the external mold segments radially outward of the flash base to provide an axially extending ridge free of white iron and traversing the axially spaced ribs.

Abstract: A brake drum arrangement for use in a braking system wherein a wheel brake is disposed outside a tire, comprises a brake drum having inner end face thereof fixedly secured to the outer end face of a wheel hub, the outer peripheral surface of the brake drum being flush with that of the wheel hub, an annular rim stopper adapted to be mounted on the outer peripheral surface of the brake drum, and a plurality of wheel clamps adapted to be fixedly secured to the outer side face of the brake drum for retaining the rim stopper. The arrangement further comprises a plurality of spacers, each being disposed between the brake drum and each wheel clamp.