Allied Corporation

Kurt R Heidmann

Andrew Marsh

Bruce E Latvala

Donald A Vorwerk

A rotor for a disc brake assembly is provided with a first portion (52) adapted for attachment to a wheel assembly (28), a second portion (54) engageable with at least a pair of friction elements and a connecting portion (56) extending between the first and second portions. The second portion (54) defines an inboard surface (60) and an outboard surface (64) facing the first portion (52). The connecting portion (56) cooperates with the second portion (54) to define a heat sink (78) at the radially inner edge of the inboard surface (60) to substantially offset tilting of the second portion toward the first portion in response to temperature expansion of the rotor second portion (54).

Rotor for a disc brake assembly

The open bore of a disc brake caliper assembly is protected by a resilient boot and retainer assembly (92). The piston (38) which forces the friction elements (26, 32) against the friction faces (14, 16) of the rotor (12) is provided with a circumferentially extending groove (118) which receives the bead (96) circumscribing one end of the boot (94). The bead (98) circumscribing the other end of the boot (94) is clamped against a land (122) of the piston 38 by a boot retainer (110). The boot retainer (110) is provided with a radially projecting portion (112) which is held against a circumferentially extending face (108) on the wall of the caliper housing (22) by the oil seal (116). Accordingly, the boot (94) may be removed and a new one installed when the brake is serviced without disassembly of the caliper assembly by withdrawing the piston (38) until the groove (118) is brought into registry with the projection (106), thereby permitting removal of the old boot and installation of a new one.

Disc brake and protective boot therefor

A disc brake is actuated through a mechanical linkage comprising a power screw (54) which is rotatably mounted within the housing (22) and a piston or power nut (38) which is threadedly engaged with the power screw (54) and which also is engaged with the friction element (32). An annular thrust collar (70) is installed within the housing (22) and defines a thrust receiving surface (73) which faces a surface (62) on the power screw (54). Brake reaction forces are transmitted to the wall of the housing (22) without loading the bolts (86) in tension by way of the surfaces (62, 73) of the thrust collar (70), the surface (108) and the retaining ring (66). A take-up ring (84) made of a deformable material is carried in the groove (82) of the thrust collar (70) so that, when a brake is manufactured, the thrust collar (70) is first installed in the bore and the retaining ring (66) is then installed in the groove (64). When the brake is first applied, the reaction forces drive the collar (70) into the position illustrated in the drawings, thereby deforming the take-up ring (84) to pass under the retaining ring 66. The take-up ring (84) thereafter assumes its original shape to engage the retaining ring (66) to hold the thrust collar (70) in place. An alternate embodiment discloses an equivalent hydraulic actuator, in which the power screw is replaced by a hydraulic coupling.

Growing community of inventors

Fairview Park, OH, United States of America

Kurt R Heidmann