Planetary Roller Screw Shock Absorber for Static Load Protection
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Solution Overview
Problem
Mechatronic systems, such as linear actuators, are unable to effectively handle large shock loads, which can lead to mechanical component damage.
Innovation Solution
Incorporating a shock absorber, such as a cylindrical polymeric member, within the drive nut assembly of a planetary roller screw to absorb and distribute shock loads, preventing mechanical overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a shock absorber is added to the planetary roller screw assembly, then the ability to handle shock loads is improved, but the device complexity increases
Solution Approach 1:
The shock absorber is integrated into the existing planetary roller screw assembly by coupling it to the outer ring, merging the shock absorption function with the existing structural components rather than adding completely separate elements
Solution Approach 2:
The shock absorber is disposed about the threaded spindle within the outer housing, nesting the shock absorption mechanism within the existing structural boundaries of the planetary roller screw assembly
2Reliability
If a shock absorber is integrated into the drive nut assembly, then component protection is improved, but the manufacturing complexity increases
Solution Approach 1:
The shock absorber is mechanically coupled to the outer ring which is part of the drive nut assembly, combining the shock absorption function with existing manufactured components rather than requiring entirely new assembly processes
3Volume of moving object
If the shock absorber is disposed about the threaded spindle, then space utilization is improved, but the device complexity increases
Solution Approach 1:
The shock absorber is disposed about the threaded spindle within the outer housing, utilizing the existing internal space of the assembly rather than requiring additional external volume
Solution Approach 2:
The shock absorber is arranged axially about the threaded spindle, utilizing the axial dimension of the existing structure to provide shock absorption without increasing the radial or lateral footprint
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
The shock absorber reduces the risk of component damage by dissipating shock loads, minimizing axial space requirements and maintaining system functionality under high load conditions.
Implementation Method 1
a shock absorber mechanically coupled to the outer ring, disposed about the threaded spindle and configured to absorb a shock load provided to the threaded spindle
Implementation Method 2
The shock absorber is configured to axially compress when subjected to an axial shock load to inhibit the rod from being mechanically overloaded
Data Source
AI summary
A mechatronic device, such as a rod-style linear actuator, is disclosed having a shock absorber. In embodiments, the device includes a threaded screw that, when rotated, is also forced to move linearly. A drive nut assembly is disposed about the screw and includes a planetary roller assembly with planetary rollers with threading that engage the threaded screw. The shock absorber is disposed linearly adjacent to the planetary roller assembly and is configured to absorb and/or dissipate a static shock load transmitted through the device so as to protect the screw. The shock absorber may be a polymeric cylindrical member disposed about the screw and contacting the planetary roller assembly via springs.