DRUM BRAKE FOR VEHICLE TRAILERS APPROVED AS SLOW RUNNERS.

摘要

1. Drum brake for vehicle trailers registered as slow moving vehicles, in particular agricultural attachments, with a hand brake (1) designed as a service brake and a parking brake and acting as a single actuating means, and the hand brake lever (4) of which is arranged on the traction vehicle and actuates, via a rod structure or a Bowden cable (9) the brake shoes (15, 16) of the drum brake (2) by means of an expanding cam arrangement (17, 20), the brake shoes (15, 16) being supported in both directions of rotation of the drum on fixed stops (18), characterised in that the expanding cam arrangement (17, 20) has an expanding cam (17) which is mounted so that its drive shaft can be deflected, and the expanding direction of rotation (19) of the expanding cam (17) being selected to be in the same direction as the direction of rotation (14) of the wheel in the case of forward drive and that the ratio of the radius (R) of the brake lining of the brake shoes (15, 16) to the distance (A) of the fixed stops (18) of the wheel axle (24) is greater than 1.5.