To provide a jack capable of generating a large torque, increasing an allowable use pressure, suppressing the occurrence of the seizure and so on of screw parts in use, and supporting a load well balanced.SOLUTION: A screw jack consists of a rotation driving part 1 with a driving spur gear 2 for output provided on its top, three driven spur gears 3 arranged at equal angular intervals on concentric circles around the driving spur gear 2, a planetary gear reduction mechanism 4 connected to each shaft of the driven spur gears 3 and to reduce the torque of the gears, a female screw shaft 5 connected to the output side of the planetary gear reduction mechanism 4, a male screw shaft 6 screwed into the female screw shafts 5, a top plate 7 fixed to the upper edge of each of the male screw shafts, and a frame 8 to store the rotation driving part 1, the planetary gear reduction mechanism 4, and the female screw shafts 5. The female screw shafts 5 are rotatably supported by the frame 8 and the jack is formed so as to receive the load applied to the jack.SELECTED DRAWING: Figure 3
【課題】大きなトルクを発生することができ、許容使用圧力を大きくすることができ、使用中のネジ部分の焼き付けなどの発生を抑制することができるとともにバランスよく荷重を支えることのできるジャッキを提供する。【解決手段】出力用の駆動平歯車2を上部に備えた回転駆動部1と、駆動平歯車2の周囲に等角度間隔で同心円上に配置された三つの従動平歯車3と、それぞれの従動平歯車3の軸に連結して当該歯車の回転力を減速する遊星歯車減速機構4と、遊星歯車減速機構4の出力側に連結された雌ネジ軸5と、雌ネジ軸5に螺入された雄ネジ軸6と、各雄ネジ軸の上端に固定された天板7と、上記回転駆動部1、遊星歯車減速機構4並びに雌ネジ軸5を収納するフレイム8とからなり、雌ネジ軸5がフレイム8に回転可能に保持されてジャッキにかかる荷重を受けるように形成されている。【選択図】図3
SCREW JACK
ネジ式ジャッキ
2025-02-07
Patent
Electronic Resource
Japanese
IPC: | B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last |