Vehicle Seat Power Slide Screw Rod Buckling Control
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Solution Overview
Problem
Conventional seat slide devices experience insufficient impact resistance due to the screw rod and load transmitting member being connected at a single point, leading to significant buckling under collision loads.
Innovation Solution
A power slide device with a screw rod supported by a pair of load transmitting members spaced in the forward/rearward direction, featuring load receiving members that restrict the position of the screw rod, distributing the axial force and limiting buckling through multiple contact points.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the screw rod and load transmitting member are connected at one point, then the structure is simple, but the impact resistance is insufficient due to large buckling under collision loads
Solution Approach 1:
The load transmitting member is divided into a first load transmitting member connected to the screw rod and a second load transmitting member connected to the rail, spaced apart along the screw rod's axial direction. This segmentation creates multiple connection points that distribute collision loads, reducing buckling of the screw rod while maintaining structural clarity.
2Device complexity
If the screw rod is supported at a single point, then the device complexity is reduced, but the buckling amount increases under axial collision forces
Solution Approach 1:
The support structure transitions from a single-point support to a distributed support along the axial dimension of the screw rod. The first and second load transmitting members are positioned at different locations along the axial direction, creating a multi-point support system that enhances stability against buckling without significantly increasing complexity.
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 solution effectively reduces the amount of buckling in the screw rod, enhancing the impact resistance by distributing the force across multiple points, thereby improving the overall structural integrity during collisions.
Implementation Method 1
a screw rod which is rotatably supported by one of the upper rail and the lower rail, a gear box, provided at an end of the screw rod supporting rail, for rotationally driving the screw rod, and a feed nut which is screw-engaged with the screw rod
Implementation Method 2
a pair of load transmitting members which are held by the screw rod supporting rail at positions spaced from each other in an extension direction of the screw rod supporting rail, and at least one load receiving member which is positioned between the pair of load transmitting members and provided on the screw rod in a manner to restrict a position of the load receiving member on the screw rod in an axial direction thereof
Data Source
AI summary
In a power slide device for vehicle seat which moves an upper rail in the forward/rearward direction by rotationally driving a screw rod, by providing a screw rod supporting rail with a pair of load transmitting members that are spaced from each other in the forward/rearward direction and providing the screw rod with a load receiving member which is in contact with the pair of load transmitting members, bucking is supported at a plurality of points when the buckling occurs in the screw rod due to an axial force acting on the screw rod, and this limits the direction of the buckling to reduce the amount of the buckling.