Electrically operated disc brake

A disc brake that may be operated by motor means, comprising a caliper having a bore with a piston slidably received therein, the caliper and piston actuatable to displace a pair of friction elements into engagement with a rotor, a planetary gear assembly disposed within said bore and comprising a sun gear, planetary gears, and a pair of ring gears, and the motor means coupled with said sun gear which drives the planetary gears, one ring gear fixed to said caliper and the other ring gear rotatable by said planetary gears, the other ring gear engaging screw means which is connected with said piston, a motor housing attached to said caliper as an extension thereof, the motor means disposed within said motor housing, and a motor plate disposed within said motor housing and effecting alignment of said motor means, operation of said motor means causing rotation of said other ring gear and operative displacement of said piston into engagement with one of said friction elements so that the caliper, by reaction, displaces the other friction element into engagement with said rotor.

A disc brake that may be operated by motor means, comprising a caliper having a bore with a piston slidably received therein, the caliper and piston actuatable to displace a pair of friction elements into engagement with a rotor, a planetary gear assembly disposed within said bore and comprising a sun gear, planetary gears, and a pair of ring gears, and the motor means coupled with said sun gear which drives the planetary gears, one ring gear fixed to said caliper and the other ring gear rotatable by said planetary gears, the other ring gear engaging screw means which is connected with said piston, the bore including ring means disposed therein and projecting radially inwardly of said bore, the ring means providing an axial stop for said other ring gear, operation of said motor means causing rotation of said other ring gear and operative displacement of said piston into engagement with one of said friction elements so that the caliper, by reaction, displaces the other friction element into engagement with said rotor.

A disc brake that may be operated by motor means, comprising a caliper having a bore with a piston slidably received therein, the caliper and piston actuatable to displace a pair of friction elements into engagement with a rotor, a planetary gear assembly disposed within said bore and comprising a sun gear, planetary gears, and a pair of ring gears, and the motor means coupled with said sun gear which drives the planetary gears, one ring gear fixed to said caliper and the other ring gear rotatable by said planetary gears, the other ring gear engaging screw means which is connected with said piston, the other ring gear including an opening with internal threads which engage threads of the screw means, operation of said motor means causing rotation of said other ring gear and operative displacement of said piston into engagement with one of said friction elements so that the caliper, by reaction, displaces the other friction element into engagement with said rotor.

A disc brake that may be operated by motor means, comprising a caliper having a bore with a piston slidably received therein, the caliper and piston actuatable to displace a pair of friction elements into engagement with a rotor, a planetary gear assembly disposed within said bore and comprising a sun gear, planetary gears, and a pair of ring gears, and the motor means coupled with said sun gear which drives the planetary gears, one ring gear fixed to said caliper and the other ring gear rotatable by said planetary gears, the other ring gear engaging screw means which is connected with said piston, the other ring gear including an opening with internal threads which engage threads of the screw means, the screw means fixed nonrotatably to said piston so that rotation of said other ring gear effects axial displacement of said screw means and piston, the other ring gear including a pair of seals thereabout, one seal engaging an interior surface of an interior bore of said piston and the other seal engaging the bore of the caliper, operation of said motor means causing rotation of said other ring gear and operative displacement of said piston into engagement with one of said friction elements so that the caliper, by reaction, displaces the other friction element into engagement with said rotor.

A disc brake that may be operated by an electric motor, comprising a caliper having a bore with a piston slidably received therein, the caliper and piston actuatable to displace a pair of friction elements into engagement with a rotor, a planetary gear assembly disposed within said bore and comprising a sun gear, planetary gears, and a pair of ring gears, and the electric motor coupled with said sun gear which drives the planetary gears, one ring gear fixed to said caliper and the other ring gear rotatable by said planetary gears, the other ring gear having fewer teeth than the fixed ring gear so that the other ring gear rotates at a slower rate than said planetary gears rotate, the other ring gear engaging screw means which is connected with said piston, the other ring gear coupled non-rotatably with the screw means in order to effect rotation of the screw means while permitting axial misalignment therebetween, operation of said electric motor causing rotation of said other ring gear and operative displacement of said piston into engagement with one of said friction elements so that the caliper, by reaction, displaces the other friction element into engagement with said rotor, and said piston and one friction element including means for effecting a non-rotatable connection therebetween.