Clamshell Housing Bushing Alignment for Vehicle Seat Locks
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Solution Overview
Problem
Current linear mechanical locks for vehicle seatbacks face challenges in achieving precision, reliability, and cost-effectiveness due to complex assembly processes and misalignment issues, which affect their performance and durability in the competitive automotive market.
Innovation Solution
A two-piece clamshell housing with integral bushing projections for precise alignment, combined with a rod and clutch springs, simplifies assembly and enhances reliability by using progressive stamping and bonding techniques, reducing costs and improving manufacturability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional linear mechanical locks are assembled inside a housing prior to bending or forming, then the locking mechanism can be constructed, but the process leads to high degree of fall-out and misalignment issues affecting precision and reliability
Solution Approach 1:
The bushings are pre-formed with integrated locating projections that define their precise position and orientation before assembly. The housing is formed with corresponding recesses that receive these projections, ensuring accurate alignment is established in advance of final assembly, eliminating misalignment issues during and after housing formation.
Solution Approach 2:
The locating projections are integrated directly into the bushing structure itself, combining the alignment feature and the bearing component into a single unified part. This eliminates the need for separate alignment fixtures or features, reducing assembly complexity and improving precision while maintaining reliability.
2Manufacturing precision
If complex assembly processes are used to achieve precision alignment, then manufacturing accuracy can be improved, but the process becomes more expensive and time-consuming
Solution Approach 1:
The bushings are designed with self-aligning locating projections that automatically position themselves correctly within the housing recesses during assembly. The geometry of the projections and recesses ensures proper alignment without requiring external alignment tools, complex fixtures, or skilled manual adjustment, thereby achieving high precision through self-service mechanisms.
Solution Approach 2:
The precise alignment features are pre-formed into the bushing and housing structures during their respective manufacturing processes. The locating projections are created with exact dimensions and orientations built-in, so that when the bushing is inserted into the housing, the alignment is automatically achieved without requiring complex post-assembly adjustment procedures.
3Productivity
If traditional assembly methods are used, then existing manufacturing capabilities can be utilized, but assembly errors increase and production costs rise
Solution Approach 1:
The locating projections on the bushings provide self-guiding features that automatically ensure correct positioning and orientation during assembly. This self-service alignment mechanism eliminates the need for complex alignment procedures, reduces assembly errors, and enables faster assembly operations while maintaining high precision, thereby improving productivity without sacrificing accuracy.
Solution Approach 2:
The housing is designed as a two-piece clamshell structure that can be separately formed and then assembled. The locating projections are formed on the bushings before insertion into the housing, allowing modular assembly where precision is built into each component independently. This segmentation enables parallel manufacturing of components and simplifies the final assembly process, improving overall productivity while maintaining 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
The improved precision linear mechanical lock achieves consistent and reliable operation with reduced assembly errors, lower production costs, and enhanced durability by ensuring proper bushing alignment and distribution of load, effectively addressing the limitations of prior art.
Implementation Method 1
one or more coil springs, called clutch springs, tightly wound about the rod and axially fixed to the housing so as to normally grip the rod against movement through the housing
Implementation Method 2
The linear mechanical lock typically has a heavier exterior coil spring, called a return spring, which returns the rod to an extended condition when the lock is released
Implementation Method 3
An inner radial bearing surface supports the rod, allowing the rod to slide through the lock housing
Data Source
AI summary
The present invention is a linear mechanical lock of the type used in vehicle seating. The linear mechanical lock uses a housing, rod, sleeve, bushings, release lever, clutch springs, and return spring. The present invention is an improved precision linear mechanical lock device using a two-piece clamshell housing. The two-piece clamshell housing has formed projections that locate and align the bushings within the housing. The two-piece clamshell housing has additional design features improving manufacturability, cost and reliability such as lanced tabs to align the internal components, lanced bumps to act as a return spring perch, cable mounts, and an extruded mounting hole.