Brake actuators

Details Brake actuators Brake actuators

1979-11-05

1982-03-30

Butler, Douglas C.

Brakes

Position adjusters

Slack

188 719, 188 728, F16D 6556

Patent

active

043219861

ABSTRACT:
A mechanical brake actuator comprises an output tappet (3) in screw-threaded engagement with a sleeve (7). In normal use, rotation of an operating member (17) by a rod or cable leads to axial advancement of the tappet (3) and sleeve (7) as a unit. Adjustment for wear is provided by rotating the sleeve (7) relative to the tappet (3) if, after a predetermined amount of rotation of operating member (17), the torque required to turn the sleeve (7) is below a predetermined value T. This is achieved by an adjuster comprising an input ring (25) coupled to an output member (29) by a torsion spring (28). The input ring (25) is coupled to operating member (17) by a lost motion connection (23,24) and output member (29) is coupled to sleeve (7) by a one-way clutch (30). After an amount of rotation of the operating member (17) predetermined by the lost motion connection (23,24) the operating member (17) entrains the input ring (25). Spring (28) is pre-loaded to transmit torque T without deforming and accordingly if at this point adjustment is necessary the sleeve will be rotated. If no adjustment is needed the spring (28) will wind up.

REFERENCES:
patent: 3848705 (1974-11-01), Burnett
patent: 4162720 (1979-07-01), Haraikawa

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