Internal shoe drum brake with two liners on each lining support

Details Internal shoe drum brake with two liners on each lining support Internal shoe drum brake with two liners on each lining support

1987-05-26

1988-11-08

Butler, Douglas C.

Brakes

Elements

Shoes

188250G, 188250B, F16D 6900, F16D 6508

Patent

active

047829249

ABSTRACT:
At least one brake shoe (14) comprising a lining support member (16) and two lining sections (20) fastened one behind the other in circumferential direction to the support member (16) is arranged in a brake drum (10) which has a circular cylindrical internal braking surface (12). Each lining section (20) has an at least approximately circular cylindrical friction surface (22) the radius of curvature (R22) of which is smaller than the radius of curvature (R12) of the braking surface (12) and the center of curvature (M22) of which is located such that only a center portion of the friction surface (22) engages the braking surface (12) upon actuation of the brake. In a rectangular coordinate system (X,Y) the origin of which lies on the axis (A) of the brake drum (10) and the abscissa (X) of which is formed by a center line between the two lining sections (20), the center of curvature (M22) of each friction surface (22) has a distance (y 22) from the abscissa which is smaller than the distance (x22) from the ordinate upon actuation of the brake. This shortens the running-in period during which the friction surfaces (22) becomes adapted to the braking surface (12) of the brake drum (10).

REFERENCES:
patent: 1928095 (1933-09-01), Dick
patent: 2167607 (1939-07-01), Alden
patent: 2213003 (1940-08-01), Heinzelman
patent: 2282439 (1942-05-01), Tilden
patent: 2690820 (1954-10-01), Raes
patent: 2924303 (1960-02-01), Sampson
patent: 3894620 (1975-07-01), Goldberg
patent: 4353442 (1982-10-01), Correa

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