Valve timing adjusting device

A valve timing adjusting device, comprising:

• a first rotation member which has a plurality of shoes and is arranged so as to be rotatable around a cam shaft;
• a second rotation member which has a plurality of vanes, is arranged in an internal hole of the first rotation member, is arranged to allow rotational motion relative to the first rotation member within a prescribed angle range and is fixed to the cam shaft;
• a timing-retarded hydraulic oil chamber and a timing-advance hydraulic oil chamber which are respectively arranged between each vane of the second rotation member and the corresponding shoe of the first rotation member;
• and
• a lock mechanism for preventing the rotational motion of the second rotation member relative to the first rotation member, the lock mechanism being operable along a radial direction of the first rotation member, the lock mechanism comprising:
• restricting means, which is movable in the radial direction of the first rotation member, for restricting the rotational motion of the second rotation member relative to the first rotation member on condition that the prevention of the rotational motion of the second rotation member relative to the first rotation member is removable;
• receiving hole, which is arranged on an outer circumferential surface of the second rotation member, for receiving the restricting means;
• force giving means for giving the restricting means a force which is directed inwardly along the radial direction of the first rotation member;
• holding means for positioning the force giving means;
• and
• preventing means for preventing the holding means from being moved outwardly along the radial direction of the first rotation member;
• wherein the preventing means is arranged in the first rotation member along an axial direction of the first rotation member, and a first end of the preventing means engages the holding means;
• wherein a second end of the preventing means is supported so as to enable rotational motion of the first rotation member relative to the cam shaft, wherein the second end engages a third rotation member.