CENTRAL MANIFOLD OF EXCAVATOR Russian patent published in 1999 - IPC

FIELD: excavating machinery and equipment. SUBSTANCE: this invention relates to single-bucket excavators. Central manifold has movable column and stationary bushes with passages for passing of hydraulic working fluid, and sealing collars. Installed in upper part of movable column is bearing. Installed in lower part of lower bush is supporting and guiding ring made of wear-resistant material with lower coefficient of friction. Made in zone of contact between column and supporting and guiding ring is radial passage which is connected with drain passage of column. At rotation of column together with excavator turntable, bearing and aforesaid supporting and guiding ring orient movable column strictly coaxially to bores in bushes thus creating favorable conditions for operation of sealing members. In result, reliability and service life of manifold are improved. EFFECT: higher efficiency. 1 cl, 1 dwg