US 12,462,842 B2
Hard disk drive having a motor assembly with a rotational balancing spring pin
Li Hong Zhang, Singapore (SG); Felicisimo T. Marquez, Jr., Singapore (SG); Xiong Liu, Singapore (SG); and Chee Kwong Cheng, Singapore (SG)
Assigned to Seagate Technology LLC, Fremont, CA (US)
Filed by Seagate Technology LLC, Fremont, CA (US)
Filed on Jan. 9, 2024, as Appl. No. 18/407,706.
Claims priority of provisional application 63/483,039, filed on Feb. 3, 2023.
Prior Publication US 2024/0265944 A1, Aug. 8, 2024
Int. Cl. G11B 19/20 (2006.01)
CPC G11B 19/2009 (2013.01) 16 Claims
OG exemplary drawing
 
1. A hard disk drive comprising:
at least one magnetic disk; and
a motor assembly configured to rotatably support the at least one magnetic disk and circumferentially rotate the at least one magnetic disk about an axis of rotation during operations of the hard disk drive,
the motor assembly comprising a mass configured to reduce a rotating unbalance of the motor assembly, the mass consisting of a hollow rotational balancing spring pin,
wherein the hollow rotational balancing spring pin comprises a rigid material that is formed into a mechanically compressible profile,
wherein the mechanically compressible profile comprises a substantially hollow cylindrical profile,
wherein the substantially hollow cylindrical profile terminates at an axially oriented gap that extends through an axial dimension of the rotational balancing spring pin,
wherein the mechanically compressible profile extends from each of two edges of the axially oriented gap into the substantially hollow cylindrical profile to form two substantially planar parallel segments that are each substantially parallel to an axis of the substantially hollow cylindrical profile.