Brakes – Wheel – Transversely movable
Patent
1984-09-25
1986-08-05
Stoner, Jr., Bruce H.
Brakes
Wheel
Transversely movable
188250F, F16D 5124
Patent
active
046037632
ABSTRACT:
This invention relates to a drum brake with two internal expanding brake shoes pivoted at substantially diametrically opposite axes. It incorporates the negative feedback of the brake shoe sliding friction forces to oppose the applied hydraulic brake actuating forces for the purpose of reducing variation in brake torque due to random or uncontrolled variations in the coefficient of friction between brake shoes and brake drum. The required brake shoe friction force feedback is accomplished by eliminating the normally leading brake shoe with its undesirable lock-up prone positive feedback and replacing it with a brake shoe pivoted about an axis diametrically opposite the pivot axis of the normally trailing brake shoe. The location of the shoe pivots is chosen to establish the required feedback magnitude by use of lever ratios whose adequacy is verified by the force equilibrium equations of the brake system. The resulting unconventional location of the brake shoe pivots permits the sliding friction forces between shoes and drum at both shoes to be applied as forces acting in a direction opposite the applied brake actuating hydraulic forces for forward vehicle motion. This preferred location of the brake shoe pivots also results in uniform wear of the brake shoe lining without the necessity for starwheel turnbuckle wear compensation as in conventional drum brakes. Devices are also provided for preventing brake lock-up during reverse operation due to the positive feedback of friction forces at both brake shoes for that direction of motion.
REFERENCES:
patent: 1787494 (1931-01-01), Sanford
patent: 2111755 (1938-03-01), Compton
patent: 2218201 (1940-10-01), Lapwood
patent: 2453808 (1948-11-01), Myklestad
Diefendorf Richard R.
Ruano William J.
Stoner Jr. Bruce H.
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