| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive unit which can control a stoke of a controlled part when a load from the controlled part is lowered.SOLUTION: A drive unit 101 controls a stroke of a controlled part which is connected to a control shaft member 60, and imparts a load in a prescribed direction to the control shaft member 60 at a normal time according to a position of the control shaft member 60 in an axial direction. A roller 54 (transmission part) which is supported to a lifter 501 abuts on a cam face 31 of a drive cam 301 when the load from the controlled part is normally imparted, and can transmit a rotation motion of the drive cam 301 to the control shaft member 60 by converting it to a reciprocation linear motion. A lifter pin 57 (engagement part) which is fixed to the lifter 501 at a rotating shaft P side with respect to the roller 54 which is engaged with a cam groove 40 of the drive cam 301, converts the rotation motion of the drive cam 301 to the reciprocation linear motion by the engagement with the cam groove 40 when the load from the controlled part is lowered, and the roller 54 is separated from the cam face 31, and can transmit it to the control shaft member 60.SELECTED DRAWING: Figure 1 |
