Self-locking Insert with Compressible Lugs for Linear Actuator Assembly
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Solution Overview
Problem
Existing self-locking inserts for linear actuators require specialized processes or additional components to be retained in holders, complicating the installation process and increasing costs.
Innovation Solution
A self-locking insert with a polymer body featuring external and internal threads, and a self-locking feature comprising lugs that compress during installation to create an interference fit with the holder, eliminating the need for additional parts or processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional retention methods (over-molding, staking, or additional retaining devices) are used to secure the threaded insert in the holder, then the insert can be retained securely, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the retention function with the insert body itself by integrating self-locking features (such as deformable lugs or expansion elements) directly into the polymer insert. This eliminates the need for separate retaining devices or specialized assembly processes, thereby reducing device complexity while maintaining secure retention through the integrated self-locking mechanism that expands or deforms to lock into the holder.
Solution Approach 2:
The insert is designed with self-locking features that automatically engage with the holder during a simple press-fit operation. The self-locking mechanism (such as resilient lugs that deform during insertion and then lock into place) performs the retention function without requiring external assistance, specialized processes, or additional components, thereby simplifying assembly while ensuring reliable retention.
2Reliability
If traditional retention methods are used, then the insert can be retained securely, but the manufacturing cost increases due to additional parts or specialized processes
Solution Approach 1:
The retention function is merged into the insert body itself through integrated self-locking features, eliminating the need for separate retaining devices or specialized assembly processes. This single-component design reduces manufacturing cost by removing additional parts and simplifying the assembly process to a standard press-fit operation.
Solution Approach 2:
The self-locking features automatically engage during a simple press-fit operation, eliminating the need for specialized assembly processes or additional components. This self-securing mechanism reduces manufacturing cost by using standard assembly techniques while ensuring reliable retention.
3Ease of operation
If a simple press-fit installation is used, then the assembly process is simplified, but the insert cannot be retained securely without additional components
Solution Approach 1:
The insert incorporates self-locking features that automatically engage with the holder during the press-fit operation itself. The resilient lugs or expansion elements deform during insertion and then lock into the holder, providing secure retention through the simple press-fit process without requiring additional components or specialized procedures.
Solution Approach 2:
The retention function is combined with the press-fit installation process through integrated self-locking features. The same pressing action that installs the insert also activates the self-locking mechanism, thereby achieving both simple assembly and secure retention through a single operation without additional components.
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
Enables secure retention of the insert within the holder without additional components or specialized processes, simplifying assembly and reducing costs while maintaining a lash-free and efficient conversion of rotary to linear motion.
Implementation Method 1
a self-locking feature configured to engage a holder to retain the self-locking insert in a predetermined position, the self-locking feature comprising at least one lug configured to be compressed by the holder during installation of the self-locking insert in the holder
Implementation Method 2
a de-lashing feature configured to interference fittingly engage the holder
Data Source
AI summary
A self-locking insert includes an insert body having an outer surface. Also included is a bore extending through the insert body, the bore defining an inner surface and configured to receive a lead screw. Further included is a self-locking feature configured to engage a holder to retain the self-locking insert in a predetermined position, the self-locking feature comprising at least one lug configured to be compressed by the holder during installation of the self-locking insert in the holder, the self-locking insert configured to be pressed into position in the holder. Yet further included is a de-lashing feature configured to interference fittingly engage the holder.