US 12,215,762 B2
Radial bearing system for ball nut and screw assembly
Stephen Harlow Davies, Shrewsbury (GB)
Assigned to GOODRICH ACTUATION SYSTEMS LIMITED, West Midlands (GB)
Filed by Goodrich Actuation Systems Limited, West Midlands (GB)
Filed on Jul. 5, 2023, as Appl. No. 18/347,232.
Claims priority of application No. 22275096 (EP), filed on Jul. 13, 2022.
Prior Publication US 2024/0019018 A1, Jan. 18, 2024
Int. Cl. F16H 25/22 (2006.01)
CPC F16H 25/2204 (2013.01) 10 Claims
OG exemplary drawing
 
1. A ball nut and screw assembly comprising:
a screw;
a nut received on the screw;
a first raceway having a helical portion defined between a convex groove of the screw and a concave groove of the nut; said first raceway having adjacent concave grooves to provide said helical portion;
a first plurality of balls provided in said first raceway; and
a first radial outboard raceway provided at a first end of said first raceway and a second radial outboard raceway provided at a second end of said first raceway, and wherein said first outboard radial raceway is formed between a first concave groove formed in a first outboard component and the outermost, external surface of the screw that is in a position between said adjacent grooves of said screw and the second outboard radial raceway is formed between a second concave groove formed in a second outboard component and the outermost, external surface of the screw;
at least a first bearing ball provided in said first radial outboard raceway and at least a second bearing ball provided in said second radial outboard raceway;
wherein said external surface of the screw that provides said first radial outboard raceway is concave.