Rod With Connection Points For Pendulum Support
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Solution Overview
Problem
Existing rod designs for pendulum supports in car chassis, particularly hybrid pendulum supports, face issues with connection failure under high tensile loads and elevated temperatures due to reduced rod end diameters, leading to overloading of thermoplastic coupling pieces and potential detachment from the rod.
Innovation Solution
The rod design features an enlarged diameter of the profiles at the rod ends, with a profile depth of at least 0.5 mm, and spindle grooves running in the same direction on both ends, which provides additional resistance to tensile forces and prevents unscrewing by canceling out angular momentum, along with a larger profile volume to enhance load capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If high-strength steels or hardened steel rods are used to reduce rod diameter, then weight is reduced, but the connection point fails under load at higher temperatures
Solution Approach 1:
The rod features a variable cross-section design where the end regions have larger diameters than the central region. This local quality change concentrates the coupling piece connection volume at the ends, providing sufficient material volume for reliable connection under thermal and mechanical loads while maintaining overall lightweight construction.
Solution Approach 2:
The invention changes the geometric parameters of the rod by introducing enlarged end regions with diameters at least 6% larger than the central region. This parameter modification increases the profile depth to at least 0.5 mm, creating adequate connection volume for the coupling pieces without compromising the lightweight design.
2Weight of moving object
If rod diameter is reduced for weight reduction, then weight decreases, but the volume of profiled material preventing positional changes becomes too small
Solution Approach 1:
The rod features a variable cross-section design where the end regions have larger diameters than the central region. This local quality change concentrates the coupling piece connection volume at the ends, providing sufficient material volume for reliable connection under thermal and mechanical loads while maintaining overall lightweight construction.
Solution Approach 2:
The invention addresses the volume deficiency by transitioning from a uniform cylindrical geometry to a tapered geometry with enlarged end regions. This dimensional change at the rod ends creates additional radial space, increasing the profile depth and connection volume without increasing the central rod diameter.
3Reliability
If coupling elements are connected over a longer length, then connection reliability improves, but manufacturing complexity increases
Solution Approach 1:
The invention changes the geometric parameters of the rod by introducing enlarged end regions with diameters at least 6% larger than the central region. This parameter modification increases the profile depth to at least 0.5 mm, creating adequate connection volume for the coupling pieces without compromising the lightweight design.
Data Source
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AI summary
The invention relates to a rod for connecting supports, in particular for absorbing axial tensile and compressive forces and torques, comprising a metal wire section with a substantially prismatic, preferably cylindrical, circumferential surface; and profiles (108) molded onto both rod end regions (104) suitable for attaching coupling parts made of plastic or light metal, preferably by overmolding. The invention is characterized in that an envelope formed around the profiles of the rod end region has a diameter (114) that is at least 6% larger than the diameter (116) of an envelope formed around the prismatic central rod region (105); and the profiles (108) have a profile depth (110) of at least 0.5 mm, preferably approximately 1 mm, at least in some areas.