Rotating device

A rotating device comprising:

• a first encircling member which encircles a shaft and which is rotatable relative to the shaft;
• a shaft supporting member which supports the shaft and which forms an annular first recess where one end of the first encircling member enters together with the shaft;
• a second encircling member which is provided at another-end side of the first encircling member and which is fixed to the shaft in a manner encircling the shaft;
• and
• a lubricant present in respective gaps between the first encircling member and the shaft, the first encircling member and the shaft supporting member, and, the first encircling member and the second encircling member, wherein:
• the gap between the first encircling member and the shaft includes a radial dynamic pressure generating portion that produces dynamic pressure in the lubricant in a radial direction when the first encircling member rotates relative to the shaft;
• an annular second recess concaved in an axial direction is formed in an another-end face of the first encircling member;
• the second encircling member comprises an entering portion that enters the second recess in a non-contact manner;
• a supporting hole is formed in the shaft along the axial direction;
• and
• the shaft supporting member comprises a supporting protrusion which is inserted in the supporting hole and which is fixed thereto.

A rotating device comprising:

• a first encircling member which encircles a shaft and which is rotatable relative to the shaft;
• a shaft supporting member which supports the shaft and which forms an annular first recess where one end of the first encircling member enters together with the shaft;
• a second encircling member which is provided at another-end side of the first encircling member and which is fixed to the shaft in a manner encircling the shaft;
• and
• a lubricant present in respective gaps between the first encircling member and the shaft, the first encircling member and the shaft supporting member, and, the first encircling member and the second encircling member, wherein:
• the gap between the first encircling member and the shaft includes a radial dynamic pressure generating portion that produces dynamic pressure in the lubricant in a radial direction when the first encircling member rotates relative to the shaft;
• an annular second recess concaved in an axial direction is formed in an another-end face of the first encircling member;
• the second encircling member comprises an entering portion that enters the second recess in a non-contact manner;
• the rotating device further comprises a hub which is fixed to an outer circumference of the first encircling member and on which a recording disk is to be mounted, wherein:
• the hub comprises:
• a hub protrusion to be engaged with a center hole of the recording disk;
• and
• a mount portion provided outwardly in the radial direction with respect to the hub protrusion;
• and
• the recording disk is fastened to the hub by being held between a clamper engaged with an outer circumference of the hub protrusion and the mount portion.