To reduce economic load of maintenance by suppressing early deterioration, damage, or function deterioration in a part having shock absorption function such as a damper.SOLUTION: A propeller unit 21 includes: a propeller 22; a cylindrical member 31 inserted into an insertion hole 24 of a hub 23 of the propeller 22 and coupled to be incapable of rotation to a propeller shaft 9; and a plurality of spherical elastic bodies 41, 42 provided in between the cylindrical member 31 and a hub 23 for absorbing impact between the propeller shaft 9 and the propeller 22 as well as transmitting rotation of the propeller shaft 9 to the propeller 22, a plurality of coronary shape concave units 34 are formed on the outer periphery surface of the cylindrical member 31, a plurality of rounded bottom grooves 27 are formed on the inner periphery surface of the insertion hole 24, and respective spherical elastic bodies 41, 42 are retained to be capable of revolution between coronary shape concave units 34 and the rounded bottom grooves 27 facing each other.SELECTED DRAWING: Figure 2
【課題】ダンパ等の衝撃吸収機能を有する部品の早期劣化、破損または機能低下を抑制し、またメンテナンスの経済的負担を軽減する。【解決手段】プロペラユニット21は、プロペラ22と、プロペラ22のハブ23の挿入孔24内に挿入され、プロペラシャフト9に回転不能に結合される筒状部材31と、筒状部材31とハブ23との間に設けられ、プロペラシャフト9とプロペラ22との間の衝撃を吸収し、かつプロペラシャフト9の回転をプロペラ22に伝達する複数の球状弾性体41、42とを備え、筒状部材31の外周面には複数の球冠状凹部34が形成され、挿入孔24の内周面には複数の丸底溝部27が形成され、各球状弾性体41、42は、互いに対向する球冠状凹部34と丸底溝部27との間に自転可能に保持されている。【選択図】図2
PROPELLER UNIT
プロペラユニット
28.12.2022
Patent
Elektronische Ressource
Japanisch