Electromechanical Linear Drive Anti-Rotation Guide
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Solution Overview
Problem
Existing electromechanical linear drives face stress issues on piston rods and housing covers due to load, as the threaded nut displacement causes anti-twist protection, leading to stress on the components.
Innovation Solution
The implementation of an anti-rotation lock using interlocking guide elements between the housing and pusher element, allowing high torque absorption and reducing the effective length of the drive rod, enabling the use of piston rods in bearings for high-force transmission and precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the piston rods are supported in the openings in the housing cover to provide anti-twist protection, then the drive structure is stabilized against rotation, but the stress on the piston rods and housing cover increases
Solution Approach 1:
The anti-rotation function is segmented from the piston rods and transferred to a dedicated anti-rotation device consisting of guide elements. The piston rods are divided into two functional parts: one for force transmission and another for guiding, while the anti-rotation task is handled separately by the guide elements on the pusher element and corresponding guides in the housing.
Solution Approach 2:
The guide elements act as an intermediary mechanism between the pusher element and the housing, providing the anti-rotation protection function without requiring the piston rods to bear this load. This intermediary structure absorbs the rotational stresses and protects the piston rods from excessive stress.
2Stability of the object's composition
If the piston rods are used for anti-twist protection, then the drive is stabilized, but the load-bearing capacity of the piston rods is reduced
Solution Approach 1:
The functions of the piston rods are segmented into force transmission and anti-rotation protection. The piston rods are designed to primarily transmit forces, while the anti-rotation function is handled by the dedicated guide elements, allowing the piston rods to be optimized for load-bearing capacity.
Solution Approach 2:
Instead of using the piston rods for both force transmission and anti-rotation, the invention inverts the approach by using separate guide elements for anti-rotation and dedicated piston rods for force transmission, thereby maximizing the load-bearing capacity of the piston rods.
3Stability of the object's composition
If the openings in the housing cover are used as anti-twist protection, then the drive structure is stabilized, but the stress on the housing cover increases
Solution Approach 1:
The guide elements serve as an intermediary structure that provides anti-rotation protection without requiring the housing cover openings to bear rotational stresses. The guide elements absorb these stresses and transfer them to the housing in a manner that minimizes stress concentration.
Solution Approach 2:
The anti-rotation function is extracted from the housing cover openings and transferred to the guide elements on the pusher element. This extraction allows the housing cover to be designed primarily for structural support without the additional burden of anti-rotation stresses.
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 solution reduces stress on piston rods and housing covers, allows for high-force transmission, and enhances precision in positioning tasks by preventing rotation and improving the sliding ability of the thrust element within the housing.
Implementation Method 1
the threaded nut forming the thrust element is displaced on the external thread of the drive rod
Implementation Method 2
the pusher element is guided against rotation relative to the housing with a force-transmitting anti-rotation lock formed by means of interlocking guide elements
Implementation Method 3
a piston rod which extends through a front-side housing cover in an opening, protrudes from the housing on one side and is carried by a pushing element
Data Source
AI summary
An electromechanical linear drive with a housing (10) and with at least one piston rod (16) extending through an end face of the housing cover (11) in an opening, projecting from the housing (10) on one side and supported by a push element (15) arranged longitudinally displaceable inside the housing (10), wherein the push element (15) is supported for its displacement by a drive rod driven by means of a drive and the piston rod (16) is arranged eccentrically to the drive rod, is characterized in that the push element (15) supporting the at least one piston rod (16) is guided relative to the housing (10) by means of a force-transmitted anti-rotation device formed by means of interlocking guide elements arranged on the housing (10) and the push element (15), respectively.