PLANETARY ROLLER-SCREW GEAR WITH MODIFIED ROLLER THREAD Russian patent published in 2012 - IPC F16H25/22 F16B33/02 

FIELD: machine building.

SUBSTANCE: planetary roller-screw gear includes multiple-thread screw and nut, as well as threaded rollers installed between them in separators. Profile of each turn of roller thread is made in the form of curved line consisting of three straight line segments. The first auxiliary segment of straight line starts from thread vee and is connected to the main segment of straight line on roller diameter d_PA. The main segment of straight line is connected to the second auxiliary segment of straight line on roller diameter d_PB. The second auxiliary straight line segment ends at roller turn top. Roller diameter d_PA is less than average roller thread diameter d_P2, and roller diameter d_PB is more than average roller thread diameter d_P2. Profile angle α_A of roller turn, which is formed with the first auxiliary segments of straight line on both sides of roller turn, is less than profile angle α, which is formed with the main segments of straight line on both sides of roller turn. Profile angle α_B of roller turn, which is formed with the second auxiliary segments of straight line on both sides of roller turn, is more than profile angle α.

EFFECT: increasing load-carrying capacity and rigidity of gear.

4 cl, 5 dwg