Vehicle Seat Weight Sensor with Pre-Assembled Frame
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional passenger weight measurement devices for vehicle seats face accuracy issues due to initial deformation and load variability caused by inaccuracies in the positional relationship between the cushion frame, load sensor, and slide rail during assembly.
Innovation Solution
A passenger weight measurement device featuring a pair of movable rails with load sensors mounted on them, where the load sensors' rods are inserted into pre-assembled mounting holes on a rectangular frame, and a bridging member is used to stabilize the fixed rails, allowing for adjustments to minimize initial deformation and load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the load sensor is disposed between the slide rail and the cushion frame, then the load transmitted to the load sensor can be always held constant regardless of longitudinal position of the vehicle seat, but initial deformation and initial load may occur when assembling the load sensor, cushion, and slide rail due to inaccurate positional relationships
Solution Approach 1:
The rectangular frame is pre-assembled with mounting holes formed at precise positions before the load sensors are installed. This preliminary assembly ensures that the positional relationships between mounting holes and load sensor attachment portions are accurately established in advance, preventing initial deformation and initial load during the final assembly process. The mounting holes are formed at predetermined positions on the rectangular frame based on design requirements, ensuring accurate alignment when load sensors are subsequently attached.
2Ease of operation
If the load sensor is disposed between the vehicle floor and the vehicle seat, then the weight measurement can be performed, but the load transmitted to the load sensor varies according to the position of the vehicle in the longitudinal direction
Solution Approach 1:
The rectangular frame serves as an intermediary component between the load sensors and the cushion frame. It provides a stable, pre-assembled structure with mounting holes at precise positions, ensuring that load sensors are attached at the correct locations regardless of the vehicle seat's longitudinal position. This intermediary structure maintains constant load transmission to the load sensors, improving measurement accuracy while keeping the installation process straightforward.
3Ease of manufacture
If the rectangular frame parts are mounted on the load sensor and then framed by assembling the parts, then the device can be assembled, but initial deformation and initial load occur due to assembly inaccuracies
Solution Approach 1:
The rectangular frame is pre-assembled as a complete unit with all mounting holes formed at their predetermined positions before being mounted on the load sensors. This preliminary assembly of the frame structure ensures that all positional relationships are established accurately in advance, preventing initial deformation and initial load that would otherwise occur during the assembly process. The pre-assembled frame is then simply mounted on the load sensors, maintaining both ease of manufacture and high precision.
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 enhances the accuracy of passenger weight measurement by maintaining consistent load transmission across the vehicle seat, regardless of longitudinal position, and reduces the risk of initial deformation and load-related errors.
Implementation Method 1
a plurality of load sensors which are mounted on the pair of movable rails and which comprises rods extending above
Data Source
AI summary
To provide a passenger's weight measurement device for a vehicle seat which can be assembled to prevent the occurrence of the initial deformation and the initial load. The passenger's weight measurement device comprises a pair of left and right fixed lower rails, a pair of movable upper rails disposed to be movable in a front-and-rear direction on each of the fixed lower rails, load sensors fixed on an upper surface of the left movable upper rail, load sensors mounted on the movable upper rail to be movable in a left-and-right direction with respect to the right movable upper rail, and a rectangular frame mounted on the load sensors. Mounting holes are formed on the rectangular frame, and rods are inserted into the mounting holes from bottom up. The rods are engaged with nuts.