Variable speed ball circulation servo steering gear unit with controllable transmission backlash

摘要

Variable speed ball circulation servo steering gear unit with controllable transmission backlash, comprising a housing, a valve element, a rotary valve, a piston, a rocker arm shaft and an upper cover, wherein the valve body and the upper cover of the housing in each case on the outer circumference of the rotary valve are set, the rotary valve by means of a a planar bearing between the upper cover and the valve body is mounted, the rocker arm shaft is attached to the housing, an arc of teeth on the rocker arm shaft with a toothed rack on the piston, the piston arranged in the housing and is connected movably to the housing, and the valve body is fixed in a sealed manner is connected with the housing; characterised in that a first distance between the a planar bearing and the valve body is fixed, a second distance between the a planar bearing and the upper cover is fixed, a first disk on the first distance is provided, and a second disk at the second distance is provided; a journal bearing between the rocker arm shaft and the housing is mounted, and an inner hole and an outer circle of the supporting bearing are designed eccentrically.