US 12,227,027 B2
High-drainage wheel hub unit
Paolo A Re, Nichelino (IT)
Assigned to AKTIEBOLAGET SKF, (SE)
Filed by AKTIEBOLAGET SKF, Gothenburg (SE)
Filed on Sep. 15, 2021, as Appl. No. 17/475,532.
Claims priority of application No. 102020000022306 (IT), filed on Sep. 23, 2020.
Prior Publication US 2022/0088963 A1, Mar. 24, 2022
Int. Cl. B60B 27/00 (2006.01); B60B 27/02 (2006.01)
CPC B60B 27/0073 (2013.01) [B60B 27/02 (2013.01); B60B 2900/211 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A wheel hub unit, comprising:
a radially outer ring comprising a radially outer surface, the radially outer surface comprising:
an annular groove formed at a top portion of the radially outer ring; and
a flattening portion formed at a bottom portion of the radially outer ring axially opposite the top portion of the radially outer ring;
wherein the radially outer ring is configured to be stationary during use of the wheel hub unit;
a radially inner ring, wherein the radially inner ring is configured to rotate during use of the wheel hub unit;
a flanged end opposite to the radially outer ring;
at least one row of rolling elements interposed between the radially outer ring and the radially inner ring; and
a sealing assembly interposed between the radially outer ring and the radially inner ring, the sealing assembly comprising:
a first annular screen comprising an annular gasket, wherein the first annular screen is fixed to the radially outer ring;
a second annular screen fixed to the radially inner ring, the second annular screen comprising:
a flange portion comprising a radially outer distal end;
a bent edge portion extending axially from the radially outer distal end of the flange portion, wherein the second screen is fixed to the radially inner ring; and
an angular interruption at a lower portion of the second annular screen;
a labyrinth seal defined by the bent edge portion and the radially outer surface of the radially outer ring, the labyrinth seal comprising:
an upper portion formed between the bent edge and the top portion of the radially outer ring; and
a lower portion axially opposite the upper portion,
wherein the labyrinth seal is circumferentially asymmetric, and
wherein the angular interruption of the second annular screen and the flattening portion of the radially outer surface of the radially outer ring coincide with one another during use of the wheel hub unit.