BRAKE HYDRAULIC DRIVE Russian patent published in 2002 - IPC

FIELD: transport engineering; hydraulic actuators of vehicle brake systems. hydraulic drive has housing and bellows. Stopped end face of bellows is made for displacement relative to housing, and opposite end face is secured on housing and is hydraulically coupled with channel to deliver working liquid into bellows space. Novelty is use of displacer installed in bellows space. Bellows consist of narrow corrugations and at least one wide corrugation. Convex surfaces and concave surfaces of corrugations are made in form of semicircles in longitudinal section. Ratio of width of wide corrugation to width of narrow corrugation is within 1.5 and 2.5. Ratio of height H between convex surface of wide corrugation and adjacent concave surface of narrow corrugation to height h between convex surface and concave surface of narrow corrugation is within 0.5 and 1.5. EFFECT: improved performance characteristics, reduced sluggishness, provision of axial stability in operation and simplified design. 4 cl, 3 dwg