Patent ID: 9746059
Date: 2017-08-29
CPC Classifications: F16H,Y10T

Claim:
1. A ball screw drive comprising a spindle nut arranged on a threaded spindle and an endless ball channel formed by the threaded spindle and the spindle nut, with balls arranged along an endless ball track circulating continuously in said ball channel, the endless ball channel comprises a load channel that is wound about a spindle axis S in a helical shape over more than one winding and a deflection channel that continuously connects two ends of the load channel to each another, the spindle nut has a nut part, on an inner circumference of which, a ball groove is formed being wound in a helical shape about the spindle axis S, with said ball groove, together with a ball groove of the threaded spindle wound in a helical shape about the spindle axis S, forming the load channel, and a deflection element comprising the deflection channel is arranged on an outer periphery of the nut part, deflection ends of the deflection element spaced apart from one another in an axial direction each engage a recess that passes through a wall thickness of the nut part, in order to deflect the balls from the load channel into the deflection channel, the recess has an unloading hole connecting, on one side, to the ball groove of the nut part and, on the other side, to the deflection end of the deflection element for unloading the balls, and a hole axis of said unloading hole is arranged at a parallel distance to a plane (E 1 ) containing the spindle axis (S), the hole axis of the unloading hole is arranged tangential to, viewed in cross section through the ball screw drive, the endless ball track of the balls in the load channel which is circular, and the ball track in the load channel is wound with a pitch angle in a helical shape about the spindle axis, wherein, viewed in longitudinal section through the ball screw drive, the hole axis of the unloading hole connects at said pitch angle to the end of the helical-shaped ball track in the load channel.