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US 8,619,387 B2Granted
Disk drive device with hub with thinness and suppressed torque decrease
AssigneeSamsung Electro-Mechanics Japan Advanced Technology Co., Ltd.
InventorsTakanori Watanabe, Hiroshi Iwai, Tomoyuki Tashiro
Life of this patent
Estimating the term…
Abstract
The disk drive device includes a base member, a hub, a clamper including an end that defines a central hole, a bearing unit which is arranged on the base member and which rotatably supports the hub, and a spindle drive unit which drives the hub to rotate. The hub is formed of magnetic material and includes an exterior cylinder portion engaged with an inner circumference of a recording disk and an interior cylinder portion to which the outer diameter portion of the magnet is fixed. The hub is provided with a fitting portion located radially outside of a space in the bearing unit for storing lubricant and configured to be fitted to the end of the clamper that defines the central hole.
Claims20
A disk drive device comprising:
- a base member;
- a hub;
- a clamper including an end that defines a central hole and configured to fix a recording disk to the hub radially outside of the end that defines the central hole;
- a bearing unit which is arranged on the base member and which rotatably supports the hub;
- and
- a spindle drive unit, which drives the hub to rotate, wherein the spindle drive unit includes a stator core having a salient pole, a coil wound around the salient pole, and a magnet configured with an outer diameter portion and a portion that is opposite to the salient pole,
- wherein the hub is formed of a magnetic material,
- wherein the base member includes a wire hole through which a wire for forming the coil passes, and a concavity that is formed at a bottom surface of the base member, at least a part of the concavity being arranged at a position that is radially outside of the outer diameter portion of the magnet,
- wherein the wire passes through the wire hole and is connected to a wiring member at the concavity at the bottom surface of the base member, and
- wherein the hub is provided with a fitting portion located radially outside of a space in the bearing unit for storing lubricant and configured to be fitted to the end of the clamper that defines the central hole.
7 more elements
A disk drive device comprising:
- a base member;
- a hub;
- a clamper including an end that defines a central hole and configured to fix a recording disk to the hub radially outside of the end that defines the central hole;
- a bearing unit which is arranged on the base member and which rotatably supports the hub;
- a spindle drive unit, which drives the hub to rotate, wherein the spindle drive unit includes a stator core having a salient pole, a coil wound around the salient pole, and a magnet configured with an outer diameter portion and a portion that is opposite to the salient pole;
- and
- a top cover arranged at an upper end of a looped circumference wall portion formed in a wall shape at an outer circumference of the base member,
- wherein the hub formed of magnetic material includes an exterior cylinder portion that is engaged with an inner circumference of the recording disk, and an interior cylinder portion to which the outer diameter portion of the magnet is fixed,
- wherein the base member includes a wire hole through which a wire for forming the coil passes, and a concavity that is formed at a bottom surface of the base member, at least a part of the concavity being arranged at a position that is radially outside of the outer diameter portion of the magnet,
- wherein the wire passes through the wire hole and is arranged along the bottom face of the base member to a wiring member to which the wire is connected at the bottom surface of the base member,
- wherein a distance in the axial direction between an upper end of the top cover and a lower end of the base member is set to be 7.5 mm or less, and
- wherein the hub is provided with a fitting portion located radially outside of a space in the bearing unit for storing lubricant and configured to be fitted to the end of the clamper that defines the central hole.
9 more elements
A disk drive device comprising:
- a base member;
- a hub;
- a bearing unit which is arranged on the base member and which rotatably supports the hub;
- a spindle drive unit, which drives the hub to rotate, wherein the spindle drive unit includes a stator core having a salient pole, a coil wound around the salient pole, and a magnet configured with an outer diameter portion and a portion that is opposite to the salient pole;
- and
- a top cover arranged at an upper end of a looped circumference wall portion formed in a wall shape at an outer circumference of the base member,
- wherein the hub formed of magnetic material includes an exterior cylinder portion that is engaged with an inner circumference of a recording disk, and an interior cylinder portion to which the outer diameter portion of the magnet is fixed,
- wherein the base member includes a wire hole through which a wire for forming the coil passes, and a concavity that is formed at a bottom surface of the base member, at least a part of the concavity being arranged at a position that is radially outside of the outer diameter portion of the magnet,
- wherein the wire passes through the wire hole and is arranged along the bottom face of the base member to a wiring member to which the wire is connected to the wiring member at the bottom surface of the base member at a position that is radially outside of the outer diameter portion of the magnet,
- wherein a distance in the axial direction between an upper end of the top cover and a lower end of the base member is set to be 7.5 mm or less.
7 more elements
Dependencies are inferred from the claim text.