Patent ID: 7219774
Filing Date: 2007-05-22
Classification: F16D,F16H

Abstract:
1. A double-wrap band brake assembly for braking a rotating member fitted in a double-wrap brake band, comprising: an annular intermediate band with a friction surface formed on an inner periphery thereof; a pair of annular outer bands which are coupled to the intermediate band in a state that respective free ends thereof are opposed to a free end of the intermediate band, and which have respective friction surfaces on inner peripheries thereof; an anchor bracket secured to a working end of either one of the intermediate band and the outer bands and latched to a main body casing; and an apply bracket secured to a working end of the other of the intermediate band and the outer bands for receiving a force from an actuator in a direction of constriction of the intermediate band and the outer bands, wherein the intermediate band is provided with a first friction material forming a first friction surface from a portion of the intermediate band near the apply bracket to a predetermined intermediate portion thereof, the first friction surface working for forming a lubricant film, and wherein the intermediate band is provided with a second friction material having a thickness that is larger than a thickness of the first friction material and forming a second friction surface from the predetermined intermediate portion to a vicinity of a coupling portion of the intermediate band with the outer bands, the second friction surface working for removing the lubricant film.