Vehicle Seat Load Sensor Assembly With Inclined Pan Frame
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Solution Overview
Problem
Conventional passenger weight measurement devices for vehicle seats face assembly challenges due to dimension and positioning errors when attaching the load sensor, leading to difficulties in assembling the device.
Innovation Solution
A passenger weight measurement device with an upper rail on a lower rail that allows for vertical shifting of a frame, using a rod to penetrate a spring holder and coil spring, and tightening a nut to compress the coil spring between the spring holder and frame, providing stable attachment and assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the load sensor is fixed directly to the vehicle floor and seat using conventional attachment methods, then the weight measurement function is achieved, but dimension errors and assembling position errors occur making assembly difficult
Solution Approach 1:
The patent introduces a pan frame with an inclined edge as an intermediary component between the load sensor and the seat cushion. This inclined edge acts as a positioning feature that guides the load sensor into the correct position during assembly, thereby eliminating positioning errors and dimension errors while maintaining measurement accuracy. The intermediary structure facilitates easier assembly without compromising the weight measurement function.
2Reliability
If rigid fixed attachment is used to ensure stable load sensor positioning, then measurement stability is improved, but assembly difficulty increases due to positioning errors
Solution Approach 1:
The pan frame is pre-formed with an inclined edge positioning feature before assembly. This preliminary action creates a built-in guide that automatically positions the load sensor correctly during the assembly process, eliminating the need for complex alignment procedures and reducing assembly difficulty while ensuring stable and reliable positioning.
3Stability of the object's composition
If conventional fixed attachment structures are used, then structural stability is achieved, but assembly precision deteriorates due to dimension errors
Solution Approach 1:
The pan frame incorporates an asymmetric inclined edge instead of a conventional symmetric vertical edge. This asymmetric geometry provides a unique positioning angle that guides the load sensor into the precise correct position during assembly. The asymmetric feature ensures that only one correct positioning orientation is possible, thereby eliminating dimension errors and assembly position errors while maintaining structural stability.
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 configuration allows for stable fixation of the load sensor, prevents initial loads from distortions during assembly, and ensures accurate weight measurement by maintaining constant load application through elastic deformation, enhancing assembly ease and measurement accuracy.
Implementation Method 1
ensures accurate weight measurement by maintaining constant load application through elastic deformation
Data Source
AI summary
A passenger's weight measurement device for a vehicle seat includes an upper rail provided on a lower rail that is fixable to a vehicle floor, the upper rail being movable in at least one of rear and front directions; a load sensor fixed onto the upper rail; and a frame provided on the load sensor and below the vehicle seat. In plan view, the load sensor protrudes from the frame in at least one of left and right directions.