| 摘要 |
FIELD: mechanical engineering; electric drives for pipe line fittings, such as gate valves or ball cocks; remote or local control of shut-off fittings, high-pressure fittings inclusive. SUBSTANCE: proposed combined drive includes electric motor with transfer unit and manual drive connected via worm gear train with member of transfer unit which is immovable during operation from electric drive and is rotating by worm of manual drive. According to one version, transfer unit is formed by three coaxial races which are engageable with one another by means of chain of balls or stepped raceways on each race. All races are interconnected by means of bearings, thus forming closed kinematic chain. According to second version, transfer unit is formed by four races, one of which is wobbler plate. EFFECT: enhanced operational reliability of drive. 2 dwg |
