US 12,460,694 B2
Hydraulic damper having a pressure tube and a ring
Matthew Lawrence Roessle, Temperance, MI (US); Thomas Mallin, Temperance, MI (US); and Christopher Serement, Trenton, MI (US)
Assigned to Advanced Suspension Technology LLC, Northville, MI (US)
Filed by DRIV AUTOMOTIVE INC., Skokie, IL (US)
Filed on Aug. 3, 2022, as Appl. No. 17/880,208.
Prior Publication US 2024/0044392 A1, Feb. 8, 2024
Int. Cl. F16F 9/58 (2006.01); F16F 9/18 (2006.01); F16F 9/34 (2006.01)
CPC F16F 9/585 (2013.01) [F16F 9/185 (2013.01); F16F 9/34 (2013.01); F16F 2222/12 (2013.01); F16F 2230/007 (2013.01); F16F 2230/36 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A ring circumscribing a moveable rod of a hydraulic damper, the moveable rod defining an axis, the ring comprising:
a first wall;
a second wall, axially spaced from the first wall, with respect to the axis;
an inner wall extending circumferentially about the axis and confronting the moveable rod and extending between the first wall and the second wall;
an outer wall extending circumferentially about the axis, the outer wall circumscribing the inner wall and extending between the first wall and the second wall; and
a fluid passage comprising:
a first channel extending radially along the second wall and from the inner wall, with respect to the axis; and
a second channel at least partially overlapping a portion of the first channel and extending axially along a portion of the outer wall and from the second wall, with respect to the axis;
wherein the second channel includes a cross-sectional area when viewed along a vertical plane extending along the axis and intersecting the second channel, the cross-sectional area including a first linear portion, a second linear portion separate from the first linear portion, and a radiused portion provided between and interconnecting the first linear portion and the second linear portion.