Composite Pivot Joint Assembly for Low-Friction Suspension Articulation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing pivot joints in vehicle suspension systems are difficult to install, costly to manufacture, and lack durability, limiting their effectiveness in providing smooth rotation and articulation between the knuckle and control arms.
Innovation Solution
A pivot joint assembly featuring a metal housing with a cylindrical bearing made of 8-12 wt% PTFE and 2-6 wt% carbon fibers, combined with a polyoxymethylene matrix, allowing axial sliding and rotational articulation, and an inner ring for three rotational degrees of freedom and one translational degree of freedom, enhancing durability and ease of installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If traditional pivot joints are used in vehicle suspension systems, then the structure can provide rotational movement between knuckle and control arms, but the installation becomes difficult and manufacturing cost increases
Solution Approach 1:
The pivot joint assembly is divided into distinct modular components: a housing, a bearing, and an inner ring. These segmented parts can be manufactured separately using optimized processes and then assembled together, simplifying installation while maintaining functional integrity between the knuckle and control arm
Solution Approach 2:
The bearing is nested within the housing, and the inner ring is nested within the bearing structure. This nested configuration allows compact assembly that simplifies installation while providing the necessary rotational movement and structural support for the suspension system
2Reliability
If traditional pivot joints are used in vehicle suspension systems, then the joint can connect knuckle with control arms, but manufacturing cost increases
Solution Approach 1:
The bearing utilizes composite material construction with a polyoxymethylene matrix reinforced with PTFE and carbon fibers. This composite approach provides enhanced durability and wear resistance while being more cost-effective to manufacture than traditional metal-bearing pivot joints, directly addressing both reliability and manufacturing cost concerns
3Ease of operation
If traditional pivot joints are used, then the joint can provide rotational movement, but friction increases reducing smoothness of operation
Solution Approach 1:
The bearing acts as an intermediary element between the housing and inner ring, providing a low-friction interface that enables smooth rotational movement. The composite material composition with PTFE and carbon fibers specifically reduces friction and wear, allowing the knuckle and control arm to rotate smoothly relative to each other while minimizing energy loss
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 provides improved durability, reduced friction, and easier installation while maintaining the necessary degrees of freedom for the knuckle's movement, enhancing the overall performance and longevity of the vehicle suspension system.
Implementation Method 1
The bearing is made as a monolithic piece of a material which consists of 8-12 wt % Polytetrafluoroethylene (PTFE), 2-6 wt % carbon fibers, and the remainder is of polyoxymethylene (POM)
Data Source
AI summary
The pivot joint assembly includes a housing with an opening which extends along an axis. A bearing is received in the opening and which has a cylindrical outer surface that is in slidable contact with another surface so that the bearing can slide in an axial direction relative to the housing. The bearing has a curved inner bearing surface. The pivot joint assembly also includes an inner ring with a curved outer surface that is in slidable contact with the curved inner bearing surface of the bearing so that the inner ring can rotate and articulate relative to the housing.