Closed loop type disc brake

Claim 1

A disc brake for a motor vehicle comprising, in combination, a rotatable braking disc, a stationary hydraulic cylinder having inner and outer pistons slidable in opposite directions which are substantially parallel to an axis of said braking disc, said pistons defining a fluid chamber into which pressurized fluid is supplied when a braking action is to be initiated, directly and indirectly actuated friction pad assemblies positioned adjacent to both faces of said braking disc, said directly actuated friction pad assembly being in abutting engagement with said inner piston and thereby forced against said braking disc when the inner piston is moved by said pressurized fluid, a pair of pad-retaining pins fixed at their one ends with said hydraulic cylinder and supporting said directly and indirectly actuated friction pad assemblies, a yoke movable in a direction parallel to said axis of the braking disc and carrying the movement of said outer piston to said indirectly actuated friction pad assembly against said braking disc when said outer piston is moved by said pressurized fluid, a braking torque absorbing structure integrally formed with said hydraulic cylinder and including a pair of leg portions extending substantially in parallel to said axis of the braking disc, said pair of leg portions having said edges extending in parallel to said axis of said braking disc respectively facing side edges of said friction pad assemblies, and said friction pad assemblies bearing at their side edges against one of said side edges of said leg portions for passing a braking torque on said friction pad assemblies to said braking torque absorbing structure when the assemblies are forced against said braking disc, a pair of guide means for guiding said yoke in a direction substantially parallel to said axis of the braking disc, each of said guide means including a support secured to said yoke and having therein a bore, a bushing disposed in said bore of said support, and a guide pin rigidly connected to an end of the leg portion of said braking torque absorbing structure and slidably inserted through said bushing into said bore of said support, said guide pin being directed in parallel to the direction of movement of said friction pad assemblies.