Patent ID: 8499851

Claim:
A fixed structure of an eccentric rod employed for a vibration generator, comprising: a rotation driving means having a driving shaft; a bar-shaped eccentric rod, having an eccentric weight portion on the side of a first end and having a rod portion connected to the driving shaft on the side of a second end, rotating by power transmitted from the rotation driving means through the driving shaft; and a vibrating portion, having a bearing portion inside a first end so that the first end of the eccentric rod is inserted into the bearing portion, arranged to cover the eccentric rod, wherein the eccentric weight portion has an insertional portion inserted into the bearing portion, a connecting portion connected to the rod portion, and a weight portion provided between the insertional portion and the connecting portion, the central axis of the insertional portion and the central axis of the connecting portion being positioned on identical straight lines and defining a first central axis extending along the longitudinal direction of the eccentric weight portion, the rod portion has a second central axis extending along the longitudinal direction of the rod portion, an extension line is defined by extending the second central axis toward the side of the eccentric weight portion, the extension line being collinear with the central axis of the insertional portion and the central axis of the connecting portion when the insertional portion is inserted into the bearing portion, an angle between the first central axis of the eccentric weight portion and the extension line is greater than 0° and not more than 10° in a state where the first end of the eccentric rod is not inserted into the bearing portion, and the first end of the eccentric rod is so inserted into the bearing portion that the eccentric rod is so fixed that the first end of the eccentric rod regularly urges the inner peripheral surface of the bearing portion.