FRICTION BOOSTER Russian patent published in 2005 - IPC

FIELD: mechanical engineering.

SUBSTANCE: invention can be used in brakes, controllable clutches, safety and overrunning clutches and other mechanisms. Proposed friction booster contains housing with fitted-in planetary gear mechanism consisting of central gear rigidly coupled with shaft, carrier flexibly coupled with housing and at least one planet pinion with coaxially installed and rigidly coupled one brake pulley, minimum. Carrier and planet pinion with brake pulley are included into pressing device playing the part of input, and part of output is played by at least one brake shoe with friction surface flexibly coupled with said housing and installed to provide friction interaction with friction surface of brake pulley forming resistance to rotation of planet pinion. All planet pinions with brake pulleys are installed on one carrier, being uniformly arranged over periphery of central gear. Each brake pulley can frictionally interact with friction surface of one of brake shoes flexibly coupled with housing. Action of flexible coupling with housing onto carrier is directed opposite to rotation of central gear, and rigidity of coupling reduced to reach of axis of rotation of plant pinion relative to axis of rotation of carrier corresponds to relationship where n is number of planet pinions, I is planet pinion ordinal; q is rigidity of flexible coupling of brake shoe with housing; where f is coefficient of friction of friction surface of brake pulley against friction surface of brake shoe; R is radius of friction surface of brake pulley; is pitch circle radius of planet pinion being positive value. Two brake pulleys can be arranged on each planet pinion frictionally interacting with two brake shoes arranged symmetrically at both sides along axis of planet pinion. Wedge mechanism can be included into mechanical circuit of pressing device with control drive. Wedge of said mechanism is flexibly coupled with housing in longitudinal direction and is rigid stop in transverse direction limiting turning of carrier in direction of rotation of central gear.

EFFECT: dispensing with servo drives, reduced weight, consumption of energy and materials.

6 cl, 14 dwg