Front Axle Cradle Assembly Positioning Reference Tool
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Solution Overview
Problem
Existing methods for mounting a front axle and cradle assembly to a vehicle body result in dimensional dispersion, leading to imbalanced steering and reduced road holding due to incorrect anchoring geometry, which is complex and costly to correct.
Innovation Solution
A method involving a reference tool with indexing points to precisely position and fix anchoring bowls for shock absorber heads, ensuring accurate alignment and attachment to maintain desired geometric angles like caster and camber, using frustoconical surfaces for precise positioning and welding for secure fixation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional mounting methods are used without precise reference tools, then the assembly process is simpler and faster, but dimensional dispersion occurs leading to incorrect anchoring geometry and deformed running gear geometry
Solution Approach 1:
A reference tool acts as an intermediary device between the mounting equipment and the vehicle body, providing precise indexing points that reproduce desired anchoring locations. This mediator ensures accurate geometry transfer without requiring complex direct measurement and calculation procedures during assembly.
Solution Approach 2:
The reference tool is prepared in advance with pre-calculated indexing points that embody the desired anchoring geometry. This preliminary preparation eliminates the need for complex real-time calculations and measurements during the actual assembly process, maintaining simplicity while ensuring precision.
2Reliability
If conventional mounting methods are used, then the assembly process is less complex, but steering balance deteriorates due to caster angle asymmetry and vehicle pulling
Solution Approach 1:
The reference tool serves as a mediator that physically enforces symmetric anchoring positions for left and right wheels, ensuring equal caster angles. By providing matching indexing points on both sides, it automatically prevents steering imbalance and vehicle pulling without requiring complex measurement and adjustment procedures.
Solution Approach 2:
The reference tool is designed with specific asymmetric features that correspond to the vehicle's symmetric requirements - the indexing points are positioned to create symmetric anchoring geometry, using controlled asymmetry in the tool design to achieve symmetry in the final assembly.
3Manufacturing precision
If precise reference tools and positioning methods are implemented, then dimensional dispersion is reduced by 40%, but the assembly process becomes more complex
Solution Approach 1:
The reference tool mediates between the need for high precision and ease of operation by providing physical indexing points that guide the positioning of anchoring bowls. This intermediary device translates complex geometric requirements into simple mechanical positioning actions, achieving 40% reduction in dimensional dispersion while maintaining operational simplicity.
Solution Approach 2:
The reference tool with its indexing points and the anchoring bowls with frustoconical surfaces create a self-positioning system. The components guide themselves into the correct positions through the mechanical interface with the reference tool, reducing the need for complex measurement and adjustment operations by the assembler.
4Productivity
If traditional assembly methods are used, then production time is shorter, but additional production line investments and new technologies would be required to correct geometry issues
Solution Approach 1:
The reference tool incorporates pre-calculated indexing points that embody the desired running gear geometry before assembly begins. This preliminary preparation ensures that the correct geometry is built in from the start, eliminating the need for time-consuming post-assembly corrections and avoiding additional production line investments in measurement and adjustment equipment.
Solution Approach 2:
The reference tool acts as a mediator that transfers the desired geometry directly to the assembly, ensuring running gear geometry accuracy is achieved during the primary assembly process rather than requiring secondary correction operations, thus maintaining productivity while improving precision.
Data Source
Figure 1
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AI summary
The present invention relates to a method for mounting a front axle/cradle assembly to a body part of a motor vehicle. The method of the invention is characterized in that it comprises in particular a step of positioning the front unit (2, 3, 5) relative to a reference tool which has indexing points reproducing the locations for anchoring damper heads (13a, 14a) of the front axle (8) according to a predetermined geometry of this axle, a step of positioning damper-head anchoring bowls (22, 23) relative to the front unit and to the indexing points of the reference tool, a step of fastening the bowls to the front unit at the position corresponding to the locations for anchoring the damper heads (13), and, after the reference tool and the front unit have been removed from one another, a step of assembling the front axle (8)/cradle (7) assembly to the front unit such that the damper heads can be anchored in their respective bowls (22, 23). The invention can be applied in the automotive field.