Vehicle Seat Lifter Screw Rod Bending Prevention
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Solution Overview
Problem
Existing lifting devices for vehicle seats are prone to large deformation and damage of the screw rod due to compressive loads, leading to bending stress and potential damage, as the locking mechanism is positioned in the middle of the swing link, causing an arched deformation and increased bending stress.
Innovation Solution
A lifting device configuration with a first restricting portion to constrain the displacement of the coupling portion between the swing link and screw rod, and a second restricting portion to further restrict displacement when a large load is applied, reducing the length of the constrained portion and minimizing bending deformation, along with an elastically deformable buffer to prevent direct contact and noise generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the locking mechanism is provided in the middle of the swing link in the longitudinal axis, then the swing link is constrained, but the screw rod can be largely bent and deformed in an arched shape between the driving device and locking mechanism
Solution Approach 1:
The patent divides the swing link into multiple segments by providing multiple locking mechanisms at different positions along its length. This segmentation creates multiple constrained portions, preventing the screw rod from bending into a large arch between the driving device and a single locking mechanism, thus resolving the contradiction between swing link stability and screw rod shape maintenance.
2Force
If a compressive load that can cause buckling is applied to the screw rod and swing link, then the lifting device can support heavy loads, but the screw rod may be largely bent and deformed
Solution Approach 1:
The patent applies preliminary action by providing locking mechanisms that preemptively constrain the swing link before compressive loads are applied. These locking mechanisms prevent the screw rod from buckling and bending under load by maintaining a predetermined constrained configuration, thus allowing the system to support heavy loads while preventing screw rod deformation.
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 configuration effectively inhibits large damage to the screw rod by reducing bending and deformation, even under compressive loads, while preventing abnormal noise generation, thus enhancing the durability and operational silence of the lifting device.
Implementation Method 1
there is an elastically deformable buffer arranged between the first restricting portion and the coupling pin
Data Source
AI summary
A lifting device for raising and lowering a cushion frame of a vehicle seat includes: a lifter link configured to be rotationally displaced to thereby raise or lower the cushion frame; a swing link configured to transmit a force for rotating the lifter link to the lifter link; a screw rod rotatably coupled to the swing link; a driving device configured to displace the screw rod along a first axis; and a first restricting portion configured to restrict displacement of a coupling portion between the swing link and the screw rod beyond a predetermined dimension in a second axis.