To provide a driving force transmission mechanism by a traction drive which is easy to be assembled and a lifting mechanism using the same, and a standing-up auxiliary device.SOLUTION: A driving force transmission mechanism 1 includes first and second rotating bodies 4, 5 in which power is transmitted by a traction drive from one to the other. The first rotating body 4 includes first and second truncated cone parts 8, 9 connected mutually and constituting an annular V-groove 10 by side surfaces 7 of both, and a bolt 13 for connecting the cone parts so that upper bottom surfaces 6 of both oppose to each other with an arbitrary gap. The second rotating body 5 includes an annular protrusion part 17 corresponding to the annular V-groove 10. The traction drive is performed by a traction force generated between the annular V-groove 10 and the annular protrusion part 17.SELECTED DRAWING: Figure 1【課題】組込みが容易なトラクション駆動による駆動力伝達機構並びにこれを利用した昇降機構及び立上り補助装置を提供する。【解決手段】駆動力伝達機構１は、一方から他方にトラクション駆動により動力が伝達される第１、第２回転体４、５を備える。第１回転体４は、相互に結合されて双方の側面７により環状Ｖ溝１０を構成する第１、第２円錐台部８、９と、これらを双方の上底面６が任意の間隙を置いて対向するように結合するボルト１３とを備える。第２回転体５は、環状Ｖ溝１０に対応する環状突出部１７を備える。トラクション駆動は、環状Ｖ溝１０と環状突出部１７との間に生じるトラクション力により行われる。【選択図】図１
