Sfs-intec Holding Ag

Andre Schadlich

Stefan Frei

Marijo Zach

Edi Peric

Daniel Sinz

A ball screw including a threaded spindle and a spindle nut has a ball deflector arranged in an opening in the lateral surface of the spindle nut. The ball deflector is formed with an upper shell and a lower shell, the lower shell being arranged radially inwardly closer to the spindle nut longitudinal axis than the upper shell. The lower shell has a substantially half-shell-shaped contour. Both the upper shell and the lower shell are fastened in the spindle nut without any further, discrete mechanical fastening elements, and the ball deflector formed thereby does not protrude beyond the outer contour defined by the spindle nut.

Ball deflector for a ball screw

A ball screw drive () including a threaded spindle () and a spindle nut () which at least partially coaxially encloses the threaded spindle () and has a stop at an axial end face (). A multiplicity of balls can circulate in the space () between the threaded spindle () and the spindle nut (). A radial stop element () is connected to the threaded spindle () in a force-fitting manner and adapted to interact with the complementary axial end face () of the spindle nut (). A bearing element is provided for receiving a first longitudinal end of the spindle nut (). The radial stop element () and the bearing element are designed in combination as an integral bearing/stop element () which has two anti-rotation features ().

Ball screw drive

A ball screw drive having a threaded spindle and a spindle nut which coaxially encloses it at least partially. The spindle nut receives a ball deflector and therefore has an imbalance caused thereby. A force transmission element is positively connected to the spindle nut. The outer surface of the spindle nut has a recess which is dimensioned and arranged to serve as a stop or groove for the force transmission element and also contributes to the imbalance compensation of the spindle nut. An imbalance compensation method is also provided by fixing the action surface as a surface recess such that the smallest width of the recess is at least 3 times as large as the maximum radial indentation thereof. The filling up of at least parts of the recess by the force transmission element is accounted for and the recess is lengthened along the spindle nut for imbalance reduction.

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Haag, Switzerland

Andre Schadlich