Steering Rack Bushing Reinforcement for Off-Road Pinion Engagement
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Solution Overview
Problem
Off-road vehicle modifications such as suspension lift and oversized tires can cause the steering rack and pinion system in vehicles like the Ford Bronco and Ford Ranger to degrade, leading to a complete loss of steering capability due to the pinion disengaging from the steering rack teeth.
Innovation Solution
A kit of parts including a bushing and retainer designed to reinforce the steering rack assembly, with a bushing that fits snugly into the steering rack housing and a retaining mechanism to prevent vibration, ensuring the pinion remains engaged with the rack teeth, and an enhanced passenger side housing assembly to withstand added torques and impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If suspension lift and oversized tires are installed for off-road modifications, then off-road capability is improved, but steering rack durability deteriorates due to increased torques and impacts
Solution Approach 1:
The patent applies beforehand cushioning by installing a bushing within the steering rack housing that provides pre-positioned support and impact absorption. This bushing cushions the steering rack against the increased torques and impacts from off-road modifications before damage can occur, preventing pinion disengagement while allowing the vehicle to maintain its off-road modifications
2Stability of the object's composition
If the steering rack housing space is fully occupied by a bushing, then steering rack stability is improved, but axial movement of the steering rack is impeded
Solution Approach 1:
The patent applies local quality by designing the bushing with different radial profiles at different locations along its length. The bushing has a first radial profile near the pinion gear that provides maximum support and stability where the pinion engages the rack teeth, and a second radial profile at the distal end that is smaller to allow axial movement. This localized variation in geometry provides stability where needed while preserving axial movement capability
Solution Approach 2:
The patent applies dynamics by creating a bushing with variable geometry that adapts its support characteristics along its length. The bushing transitions from a larger radial profile that constrains lateral movement and provides stability to a smaller radial profile that allows axial movement, creating a dynamic balance between stability and movement permission
Data Source
AI summary
A kit for reinforcing a rack and pinion steering system includes a bushing to be slid over an end of a steering rack and inserted into an opening of a rack housing of the rack and pinion steering assembly on the driver's side. The kit may also include a retainer to be inserted into the opening of the rack housing to ensure that the bushing remains in position inside the rack housing. The bushing includes a reinforcing side and a retaining side. The reinforcing side has a shape that mimics the shape of the space between the rack rod and the rack housing. The kit may further include an enhanced passenger side housing assembly that includes a bushing made of a wear resistant material. The passenger side bushing is disposed within a passenger side main housing. The enhanced passenger side housing assembly replaces the original passenger side housing.