US 11,940,036 B2
Planetary roller screw mechanism
Folly Abevi, Chambery (FR)
Assigned to ALT BEARINGS, Sainte-Helene-du-Lac (FR)
Appl. No. 17/291,319
Filed by Folly Abevi, Chambery (FR)
PCT Filed Oct. 18, 2019, PCT No. PCT/FR2019/052472
§ 371(c)(1), (2) Date May 5, 2021,
PCT Pub. No. WO2020/094937, PCT Pub. Date May 14, 2020.
Claims priority of application No. 1860270 (FR), filed on Nov. 8, 2018.
Prior Publication US 2022/0018425 A1, Jan. 20, 2022
Int. Cl. F16H 25/20 (2006.01); F16H 25/22 (2006.01); F16H 55/08 (2006.01)
CPC F16H 25/2252 (2013.01) [F16H 55/08 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A planetary roller screw mechanism comprising a screw provided with an outer threat; a nut disposed around and coaxially with the screw and comprising an inner thread; and rollers that each have an outer thread and inserted between the screw and the nut such that the outer thread of the roller engages with the outer thread of the screw and the inner thread of the nut, each roller having two ends each provided with an outer gear teeth, each outer gear teeth having, in cross-section, an outer diameter less than or equal to a root diameter of the outer thread of the rollers; and two synchronizing gear teeth coaxial with the screw and in which the outer gear teeth of the rollers engage,
wherein said outer gear teeth of the rollers have teeth with a flank having, in cross-section, a convex hypotrochoidal profile and said synchronizing gear teeth have teeth with a flank having, in cross-section, a hypotrochoidal or epitrochoidal profile.