Automotive Control Arm Bushing Linear Mobility Design
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Solution Overview
Problem
Existing automotive control arm bushings lack effective solutions for linear mobility and replacement, with prior designs either providing excessive resistance to axial movement or failing to prevent linear movement altogether.
Innovation Solution
The design incorporates an elastomeric center portion with convex and concave segments and joinable locking sleeves, allowing for controlled linear mobility or a spool-like configuration with radial relief and beveled openings to accommodate fastening devices, along with optional stop features to prevent movement during high torque, and a method for replacing bushings by compressing the elastomeric center portion within the control arm housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If radial flanges are provided on the ends of rubber bushings to increase resistance to axial movement, then the resistance to linear movement between inner and outer members is increased, but the bushing becomes more complex and harder to replace
Solution Approach 1:
The bushing is divided into three main segments: an inner member, an elastomeric center portion, and an outer member. The elastomeric center portion is further segmented into convex and concave segments along its radius. This segmentation allows each part to perform its specific function while simplifying the overall structure compared to traditional flanged designs.
Solution Approach 2:
The elastomeric center portion has different local properties along its radius - convex segments and concave segments with different degrees of relief. This local variation in geometry creates the desired resistance to axial movement in specific areas while maintaining simplicity in the overall bushing design.
2Device complexity
If the rubber bushing is made the same length as the inner member to form flanges, then the bushing structure is simplified, but the control over linear movement is reduced
Solution Approach 1:
Instead of making the entire bushing structure complex with flanges, the patent applies local geometric variations (convex and concave segments) only to the elastomeric center portion. This maintains overall structural simplicity while providing localized control over linear movement characteristics.
3Stability of the object's composition
If traditional bushings are designed to prevent linear movement, then stability is improved, but the ability to accommodate wear and allow controlled movement is reduced
Solution Approach 1:
The bushing design allows for dynamic adjustment and controlled movement through the elastomeric center portion's convex and concave segments. These segments can deform and adapt under load, providing both stability during normal operation and accommodation of wear over time, unlike rigid traditional designs.
Solution Approach 2:
The elastomeric material properties and geometric parameters (convex/concave segment ratios) can be adjusted to change the bushing's behavior. This allows the same basic structure to provide both stability and wear accommodation by modifying material composition or geometric dimensions.
4Reliability
If bushings are made non-separable to ensure stability, then reliability is improved, but the ease of replacement is significantly reduced
Solution Approach 1:
The bushing is segmented into separable components (inner member, elastomeric center, outer member) that can be assembled and disassembled. The locking sleeves with set screws provide a reliable connection that can be easily separated for replacement, combining reliability with ease of maintenance.
Solution Approach 2:
The locking sleeves are pre-positioned and secured with set screws before installation into the control arm. This preliminary securing action ensures reliable positioning during operation while allowing for straightforward removal and replacement when needed.
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 solution enables controlled linear mobility while preventing excessive movement and facilitates easy replacement of bushings, enhancing the durability and adjustability of automotive control arm bushings.
Implementation Method 1
an elastomeric center portion and two joinable separable locking sleeves
Implementation Method 2
said elastomeric center portion being radially relieved with a portion of the radius being convex segments and a portion of the radius being concave segments, wherein the ratio of convex surface to concave surface is 35:65 to 65:35
Implementation Method 3
The elastomeric center portion has a centered opening wherein the centered opening is beveled from each side of the center portion
Implementation Method 4
two joinable separable locking sleeves...said distal portion having a diameter larger than the centered opening in the elastomeric center portion
Data Source
AI summary
An automotive control arm bushing. The bushing comprises an elastomeric center portion and two joinable separable locking sleeves, said elastomeric center portion being radially relieved with a portion of the radius being convex segments and a portion of the radius being concave segments, wherein the ratio of convex surface to concave surface is 35:65 to 65:35. In addition, there is an automotive control arm bushing having no linear mobility and a method of replacing an automotive control arm bushing.