Seagate Technology Incorporated

Jerry Joseph Weingord

Thaveesinn Vasavakul

Norbert Steven Parsoneault

Alexander Gredinberg

Troy Michael Herndon

Robert Alan Nottingham

Jeffry Arnold LeBlanc

Mohammad Mahbubul Ameen

Christopher Michael Woldemar

James Sidney Lee

James Scott Bowdoin

Kenneth Cornyn

Donald J MacLeod

James Ian Lee

Neyram Hemati

Sanjay Champaklal Sheth

JimPo Wang

Peyman K Nejad

Bao Trinh

In one example, an FDB motor having a shield member is provided. In one example, the method includes disposing a first member and a second member for relative rotation about an axis of rotation. An annular shield member is attached to the first member, the shield member disposed adjacent a fluid reservoir for containing a bearing fluid. The reservoir is filled through an aperture (e.g., a fill hole) in the shield member. Thereafter, the aperture is at least partially sealed. The aperture may be hermetically sealed via one or more laser pulses. In other examples, a two piece shield is provided for shielding a reservoir without a fill hole.

Shield restricting axial movement

A component of a disc drive has a coating of a predetermined length on its surface, the coating having at least two separate tapered regions applied in independent steps, the at least two separate tapered regions each having a length that is less than the predetermined length of the component surface. When the component is a shaft of a spindle motor, the ends of the shaft are masked before the tapered regions of coating are applied, and the thickness of the masks covering the shaft ends is varied to control a taper of tapered regions.

Tapered shaft coating

In one example, a fluid dynamic bearing motor having a shield member is provided. In one example, the method includes disposing a first member and a second member for relative rotation about an axis of rotation. An annular shield member is attached to the first member, the shield member disposed adjacent a fluid reservoir for containing a bearing fluid. The reservoir is filled through an aperture (e.g., a fill hole) in the shield member. Thereafter, the aperture is at least partially sealed. The aperture may be hermetically sealed via one or more laser pulses. In other examples, a two piece shield is provided for shielding a reservoir without a fill hole.

Shielding fluid reservoirs of fluid dynamic bearing motors

A fluid dynamic bearing motor is described. In one embodiment, the fluid dynamic bearing motor includes a base that has a bore hole and a liner secured within the bore hole. The fluid dynamic bearing motor also includes a rotor assembly that has a shaft, which is partially disposed within the liner and configured to rotate relative to the liner. A fluid dynamic bearing is disposed between the liner and the shaft to support this relative rotation.

Fluid dynamic bearing spindle motor

Method for controlling shaft coating taper

A through hub fill hole and air vent having an enlarged fluid diffusion path is provided for spindle motors. Oil leakage and evaporation from a motor is reduced. In an aspect, oil is retained under conditions of at least a 1000 G shock event. In an aspect, the hub fill hole has a varying diameter and geometry, and is angled, further reducing oil leakage. In an aspect, an additional cavity is employed within the hub, for maintaining rotor rotational balance. The process of filling oil into a spindle motor is made easier from a motor set up and tooling perspective. Removal of the hub and other motor components is not necessary for filling a motor. Large diameter oil fill dispenser heads, subambient and ambient fill processes, and micro dispenser fill processes may be utilized. A measured and controlled amount of oil can be dispensed, reducing variability in the motor filling process.

Through hub oil fill and vent for a fluid dynamic bearing motor

A method of assembling a motor comprising assembling the shaft and thrust plate to be used in the fluid dynamic bearing assembly, and at least partially inserting the combined shaft and thrust plate into a sleeve which is adapted to support a hub which in turn may support one or more disks for rotation in a disc drive or similar environment. A counterplate cup of a generally U shaped or cup shaped design including a base which is substantially parallel to a top surface of the thrust plate, and sides of a diameter which is slightly greater than the diameter of the thrust plate and which are parallel to the thrust plate is provided, filled with oil, and having its open end facing the thrust plate. Next the shaft and hub are pressed with the counterplate cup, the counterplate cup being pressed down over the end of the thrust plate so that the upraised sides of the cup fit easily over the ends of the thrust plate and can be pressed fit tightly over the upraised outer surface of the sleeve, tightly fitting the inside of the counterplate cup over the outside surface of the sleeve. During this press fit, the oil is pushed out of the region between the thrust plate upper surface and the counterplate cup bottom surface, and as the upraised sides of the cup fit over the outside of the sleeve, the oil fills the section between the lower surface of the thrust plate and the upper surface of the sleeve as well as the gap between the shaft and the surrounding sleeve.

Low cost fluid dynamic bearing motor

A single plate hydrodynamic bearing motor comprising an integrated hub and shaft assembly. The hub is formed of molded plastic and at least one disk is affixed to the hub.

Hydrodynamic bearing motor having a molded plastic hub

Method of assembling a low cost fluid dynamic bearing motor

A disc drive spindle motor which has an increased resistance to operating and non-operating shock and vibration is provided, which improves the resistance to non-operating shock, is easy to manufacture and assemble, and which remains low in weight, low in height, and has low power consumption.

Growing community of inventors

Scotts Valley, CA, United States of America

Jerry Joseph Weingord