Adjustment Fitting Tolerance Compensation via Measured Eccentric Cam Adaptation
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Solution Overview
Problem
Manufacturing tolerances in adjustment fittings for motor vehicle seats lead to switchover clearance, loss angle, reduced strength, and non-uniform startup due to geometric deviations, which existing methods can only partially mitigate.
Innovation Solution
Measuring the geometry of eccentric cam parts in the assembled state and individually matching the geometry of the transmission element to compensate for manufacturing tolerances, optimizing the interaction between eccentric cam parts and the transmission element through adjustable indentations and engagement elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If standard manufacturing processes are used for adjustment fittings, then production costs are reduced and manufacturing speed is increased, but manufacturing tolerances cause switchover clearance, loss angle, and non-uniform startup
Solution Approach 1:
The patent applies preliminary action by measuring the geometric parameters of eccentric cam parts during assembly and pre-determining the required geometric adjustments for transmission elements. This allows the transmission elements to be individually adapted before final assembly, compensating for manufacturing tolerances in advance and eliminating the need for time-consuming parts selection processes.
Solution Approach 2:
The patent implements parameter changes by adjusting geometric parameters of transmission elements based on measured values from eccentric cam parts. The transmission elements are individually modified to match the actual dimensions of the cam parts, thereby compensating for manufacturing tolerances and achieving precise geometric relationships without requiring tighter manufacturing tolerances on all components.
2Reliability
If parts selection at assembly is implemented to compensate for manufacturing tolerances, then operational reliability is improved, but assembly time increases and productivity decreases
Solution Approach 1:
The patent applies feedback by measuring the actual geometric parameters of eccentric cam parts during assembly and using these measured values to determine the required geometric adjustments for transmission elements. This closed-loop approach ensures that each transmission element is individually adapted to match its corresponding cam parts, guaranteeing operational reliability while eliminating the need for time-consuming parts selection.
Solution Approach 2:
The patent implements self-service by enabling the assembly process to automatically compensate for manufacturing tolerances through on-site measurement and adjustment. The geometric parameters are determined during assembly itself rather than requiring pre-selection of parts from inventory, allowing the system to self-correct for tolerances without external intervention or time-consuming search processes.
3Manufacturing precision
If transmission elements are individually adapted to measured values, then switchover clearance and loss angle are minimized, but the complexity of the manufacturing process increases
Solution Approach 1:
The patent applies segmentation by separating the manufacturing process into distinct stages: standard production of eccentric cam parts, measurement of geometric parameters during assembly, and individual adaptation of transmission elements based on measured values. This segmentation allows the majority of components to be produced using standard processes while only requiring precise work on specific transmission elements, thereby minimizing overall process complexity.
Solution Approach 2:
The patent implements local quality by applying individual geometric adaptation only to transmission elements that directly interact with the measured eccentric cam parts, rather than requiring all components to be manufactured with high precision. This localized approach to quality enhancement minimizes the overall complexity of the manufacturing process while achieving the required precision where it matters most.
4Manufacturing precision
If manufacturing tolerances are reduced across all components, then switchover clearance and loss angle are minimized, but production costs increase significantly
Solution Approach 1:
The patent implements parameter changes by allowing standard manufacturing tolerances on eccentric cam parts and selectively adjusting only the geometric parameters of transmission elements based on measured values. This approach achieves the required precision in the final assembly without requiring expensive tight tolerances on all components, significantly reducing production costs while maintaining high manufacturing precision where critical.
Data Source
AI summary
A method for producing an adjustment fitting, particularly for a vehicle seat is provided, whereby an outer wheel is associated with a first fitting part, the wheel having inner toothing, and having an inner wheel that can be associated with a second fitting part, the wheel having outer toothing, wherein the inner wheel having the outer toothing is inserted into the outer wheel having the inner toothing eccentrically to a rotational axis in the manner of a wobble mechanism, wherein partial eccentric elements are inserted rotatably with respect to each other in an eccentric receiving chamber formed between the rotational axis and the inner wheel so as to produce variable eccentricity, wherein a transmission element having an engagement element for actuating the partial eccentric element is inserted such that the engagement elements interacts with a catch of the partial eccentric element. In spite of the production tolerances of the components, overall higher quality and higher operational safety of the produced adjustment fitting are to be achieved. For this purpose, the geometry of the partial eccentric element is measured, and the geometry of the transmission element is individually adapted according to the data of the measurement before inserting the transmission element.