Hydrodynamic bearing device, spindle motor including the same, and recording and reproducing apparatus

A hydrodynamic bearing device, comprising:

• a shaft;
• a shaft side member fixed to one end portion of the shaft;
• a bearing body externally fitted to the shaft in a freely rotating manner;
• a bearing body side member fixed to the bearing body;
• at least one radial bearing having a radial dynamic pressure generating groove, formed on at least one of an outer peripheral surface of the shaft and an inner peripheral surface of the bearing body;
• and
• a thrust bearing having a thrust dynamic pressure generating groove, formed on at least one of one end face of the bearing body in a direction of a shaft center and a surface of the shaft side member facing the end face,
• the radial bearing and the thrust bearing being communicated to each other,
• the radial bearing and the thrust bearing being filled with an operating fluid, wherein
• the hydrodynamic bearing device further comprises a slip-out preventing device for preventing the bearing body from slipping out from the other end portion of the shaft while allowing the bearing body to rotate,
• the slip-out preventing device including a movable side engaging part formed on the outer peripheral surface of the bearing body and a fixed side engaging part fixed on the shaft side member,
• the movable side engaging part being engageable with the fixed side engaging part in a slip-out direction of the bearing body.