US 7,587,954 B2
	Ball screw
Jurgen Osterlanger, Emskirchen (Germany); Dieter Adler, Herzogenaurach (Germany); and Manfred Kraus, Herzogenaurach (Germany)
Assigned to Ina-Schaeffler KG, Herzogenaurach (Germany)
Appl. No. 10/558,395 PCT Filed May 24, 2004, PCT No. PCT/EP2004/005613 § 371(c)(1), (2), (4) Date Nov. 23, 2005, PCT Pub. No. WO2004/106775, PCT Pub. Date Dec. 09, 2004.
Claims priority of application No. 103 24 465 (DE), filed on May 30, 2003.
Prior Publication US 2006/0288813 A1, Dec. 28, 2006
Int. Cl. F16H 27/02 (2006.01)

U.S. Cl. 74—89.42  [74/424.71; 74/424.75]

5 Claims

1. A ball screw having a spindle nut arranged on a spindle, together with balls which are arranged in a series and are capable of rolling in a helical ball track, the helical ball track being defined by a thread groove formed on the spindle and by a thread groove formed on the spindle nut, the balls arranged in a series being returned in a return duct from an outlet end to an inlet end of a common turn of the helical ball track, wherein the ratio between the pitch of the helical ball track and the diameter of the balls ranges from 1.02 to 1.2.