Variably operated valve system and tightening structure between control shaft and actuator of variably operated valve system

A tightening structure between a control shaft and an actuator of a variably operated valve system, comprising:

• a drive shaft to which a rotating force is transmitted from a crankshaft;
• a drive cam integrally rotated with the drive shaft;
• a control shaft rotatably installed and having an oil passage formed along an inner axial direction of the control shaft;
• an eccentric shaft eccentrically installed at a predetermined location of the control shaft with respect to a rotary center of the control shaft and to which oil is supplied from the oil passage;
• a linkage member having a bolt inserting hole and a fixture bolt inserted through the bolt inserting hole, the fixture bolt being tightened to a female screw hole installed on the control shaft to fix the linkage member to the control shaft;
• an actuator configured to give a rotating force to the control shaft via the linkage member;
• a rocker arm swingably disposed with the eccentric shaft as a center;
• a link arm configured to link the drive cam and the rocker arm to convert the rotating force of the drive cam to a swing motion of the rocker arm;
• and
• a swing cam to which a swing force of the rocker arm is transmitted via a link rod in order for an engine valve to be operated in a valve open direction;
• a planar section configured to cut out an outer peripheral surface of the control shaft in order for the linkage member to be grasped from the axial direction of the control shaft;
• a bolt hole drilled along a diameter direction of the control shaft via the oil passage from the planar section and at an opposite side of which the female screw of the control shaft is formed;
• and
• a limitation section disposed over the linkage member and the planar section to limit a movement of the linkage member in a shearing direction of the linkage member to the planar section, wherein an inner diameter of a portion of the belt hole corresponding to the oil passage is set to be larger than an inner diameter of the oil passage and the fixture bolt is screwed and tightened to the bolt hole via the bolt inserting hole of the linkage member to fix the linkage member to the control shaft.

A variably operated valve system, comprising:

• a drive shaft to which a rotating force is transmitted from a crankshaft;
• a drive cam integrally rotated with the drive shaft;
• a control shaft rotatably installed and having an oil passage formed along an inner axial direction of the control shaft;
• an eccentric shaft eccentrically installed at a predetermined location of the control shaft with respect to a rotary center of the control shaft and to which oil is supplied from the oil passage;
• a linkage member having a bolt inserting hole and a fixture bolt inserted through the bolt inserting hole, the fixture bolt being tightened to a female screw hole installed on the control shaft to fix the linkage member to the control shaft;.
• an actuator configured to give a rotating force to the control shaft via the linkage member;
• a rocker arm swingably disposed with the eccentric shaft as a center;
• a link arm configured to link the drive cam and the rocker arm to convert the rotating force of the drive cam to a swing motion of the rocker arm;
• and
• a swing cam to which a swing force of the rocker arm is transmitted via a link rod in order for an engine valve to be operated in a valve open direction;
• a planar section configured to cut out an outer peripheral surface of the control shaft in order for the linkage member to be grasped from the axial direction of the control shaft;
• a bolt hole drilled along a diameter direction of the control shaft via the oil passage from the planar section and at an opposite side of which the female screw of the control shaft is formed;
• and
• a limitation section disposed over the linkage member and the planar section to limit a movement of the linkage member in a shearing direction of the linkage member to the planar section,
• wherein an outer diameter of the fixture bolt is set to be smaller than an inner diameter of the oil passage and the fixture bolt is screwed and tightened to the bolt hole via the bolt inserting hole of the linkage member to fix the linkage member to the control shaft.