Ball Screw Drive Deflection Element Recess Design
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Solution Overview
Problem
Existing ball screw drives face limitations in efficiently transitioning balls from the load channel to the deflection channel, which affects their load capacity and reliability.
Innovation Solution
The ball screw drive features a spindle nut with a helically wound ball groove and a deflection element on the nut part, where the deflection ends engage recesses that include an unloading hole, allowing balls to be transferred tangentially from the load channel to the deflection channel with minimal material removal, enhancing load capacity and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the deflection tube is passed completely through the wall thickness of the nut part, then the ball transfer function is achieved, but the wall thickness of the ball groove shoulder is reduced significantly
Solution Approach 1:
The invention extracts only the necessary portion of the deflection tube (the deflection end) and inserts it into the recess without passing it completely through the wall thickness. This partial extraction approach maintains the ball transfer function while preserving the structural integrity and wall thickness of the ball groove shoulder.
Solution Approach 2:
The invention introduces a new dimensional approach by creating a recess with an unloading hole that connects to the deflection end at an angle. This angled connection allows the deflection end to be positioned effectively without requiring complete penetration through the wall thickness, thus solving the contradiction between functional requirement and structural integrity.
2Ease of operation
If a larger hole is used to pass the deflection tube through, then the ball transfer is facilitated, but more material must be removed from the ball groove shoulder
Solution Approach 1:
The invention extracts only the minimal necessary material to create the recess and unloading hole, rather than removing large amounts of material to pass a deflection tube completely through. This selective extraction preserves the ball groove shoulder while still enabling effective ball transfer through the deflection end.
Solution Approach 2:
The unloading hole is oriented at an angle relative to the wall thickness direction, allowing the deflection end to connect to the ball groove from a different dimensional perspective. This angular approach enables ball transfer functionality with minimal material removal.
3Loss of substance
If the deflection end is inserted only up to the beginning of the unloading hole, then material removal is minimized, but the ball transfer efficiency must be maintained
Solution Approach 1:
The invention applies partial action by inserting the deflection end only to the beginning of the unloading hole rather than completely through the wall. This partial insertion is sufficient to achieve effective ball transfer while minimizing material removal, demonstrating that full penetration is not necessary for functional effectiveness.
Solution Approach 2:
The unloading hole acts as an intermediary structure that facilitates ball transfer from the ball groove to the deflection end. By positioning the deflection end at the beginning of this intermediary hole, the system achieves efficient ball transfer through the mediated path without requiring deep insertion or excessive material removal.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This design improves the load capacity and reliability of the ball screw drive by allowing a smaller unloading hole diameter, reducing material removal from the ball groove shoulder, and ensuring smooth, low-noise ball transfer with minimal acceleration forces.
Implementation Method 1
it is possible to provide an approximately tangential connection of the unloading hole to the load channel wound in a helical shape, so that the balls in a preferred refinement can be transferred tangentially out of the load channel into the deflection channel
Data Source
AI summary
A ball screw drive with a spindle nut (1) arranged on a screw spindle (2) and a continuous ball channel (7) formed by the screw spindle (2) and the spindle nut (1), in which channel balls arranged along a continuous ball track (8) circulate continuously, wherein the continuous ball channel (7) includes a load channel (9) wound in a spiral shape, with more than one winding, about a spindle axis (S) and a deflecting channel (10) which continuously connects the two ends of the load channel (9) to one another, wherein the spindle nut (1) has a nut part (4), on the inner circumference of which a ball groove (6) is formed being wound in a spiral shape about the spindle axis S, which ball groove, together with a ball groove (3) of the screw spindle (2) being wound in a spiral shape about the spindle axis S, forms the load channel (9), and wherein a deflecting element (5) including the deflecting channel (10) is arranged on the outer periphery of the nut part (4), and the deflecting ends (12) of the deflecting element (5) axially spaced apart from one another each penetrate a recess (11) through the thickness of the wall of the nut part (4), in order to deflect balls from the load channel (9) into the deflecting channel (10), and wherein the recess (11) has an unloading bore (15) connecting to the ball groove (6) of the nut part (4) and to the deflecting end (12) of the deflecting element (5) for unloading the balls, the axis of which unloading hole is arranged at a parallel distance to a plane (E1) containing the spindle axis (S).