US 11,725,714 B2
Ballscrew seal
Michael Somerfield, Stoke-on-Trent (GB)
Assigned to GOODRICH ACTUATION SYSTEMS LIMITED, Solihull (GB)
Filed by Goodrich Actuation Systems Limited, Solihull (GB)
Filed on Aug. 21, 2020, as Appl. No. 16/999,617.
Claims priority of application No. 19193494 (EP), filed on Aug. 23, 2019.
Prior Publication US 2021/0131539 A1, May 6, 2021
Int. Cl. F16H 25/24 (2006.01); F16H 25/22 (2006.01); F16J 15/3204 (2016.01)
CPC F16H 25/2418 (2013.01) [F16H 25/2214 (2013.01); F16J 15/3204 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A ballscrew assembly comprising:
a nut having a first helical groove formed on a radially inner surface and defining an axis (X);
a screw disposed along the axis (X) and within the nut, the screw comprising a second helical groove formed on a radially outer surface and opposed to the first helical groove so as to form a helical raceway;
a plurality of balls disposed in the helical raceway;
an annular seal disposed radially between the nut and the screw, the annular seal comprising:
a resilient body; and
a layer formed of PTFE and disposed radially between the resilient body and the screw and configured to contact the radially outer surface of the screw; and
an annular scraper disposed axially adjacent to the annular seal, the annular scraper comprising one or more slots angled relative to the axis X, the annular scraper configured to receive fluid at an outboard end and expel fluid at an inboard end, wherein the nut further comprises one or more passages having an opening at the radially inner surface, the annular scraper arranged adjacent to the opening and configured such that fluid guided from the second helical groove by the slots enters the one or more passages to be expelled from the ballscrew assembly.