Front Differential Friction Locking for ATV Traction and Cornering
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Solution Overview
Problem
All-terrain vehicles face challenges in traversing poor road conditions due to the effect of differentials, which can lead to wheels becoming stuck, especially when one wheel is deeply sunk in mud or hanging in the air. Existing fully lockable differentials risk deformation and have high manufacturing costs.
Innovation Solution
A differential design for all-terrain vehicles that includes a front differential with an input bevel gear, a ring gear joinder, planetary gears, and semi-axle gears, along with a friction transfer mechanism using interleaved friction plates and rings that allow for axial movement, enabling controlled torque transfer and locking states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a differential is arranged in the drive train to allow different rotational speeds of inner and outer wheels during cornering, then the vehicle can navigate turns smoothly, but the vehicle gets stuck when one wheel is sunk in mud or hanging in the air due to loss of traction
Solution Approach 1:
The differential locking mechanism dynamically switches between unlocked and locked states based on driving conditions. During normal cornering, the differential remains unlocked to allow speed differentiation. When poor traction is detected (one wheel sunk or hanging), the locking mechanism engages to force equal speed distribution, ensuring both wheels receive driving force regardless of traction conditions.
2Reliability
If fully lockable differentials with locking mechanisms are used to enhance ability to get unstuck, then torque is transferred effectively to wheels with traction, but the differential components are at risk of deformation and manufacturing cost increases
Solution Approach 1:
The locking mechanism is segmented into modular components including a locking pin, actuator, and engagement features that can be manufactured separately and assembled. This segmentation allows each component to be optimized for its specific function, reducing overall manufacturing complexity and cost while maintaining locking capability.
Solution Approach 2:
The patent introduces a locking pin as an intermediary element that mediates between the differential gears and the drive shafts. This locking pin serves as a simple mechanical mediator that can engage or disengage to provide locking functionality without requiring complex mechanisms, thereby reducing manufacturing cost and minimizing deformation risks to critical differential components.
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 differential design enhances the all-terrain vehicle's ability to navigate challenging terrain by providing controlled torque distribution and locking capabilities, reducing the likelihood of getting stuck while maintaining durability and cost-effectiveness.
Implementation Method 1
a plurality of friction members disposed between the first ring and the second ring
Data Source
AI summary
A front differential includes an outer ring spline mounted on an inner housing for rotation with the ring gear joinder, an inner ring spline mounted on one of the semi-axle gears, and a plurality of friction members disposed between the inner ring and the outer ring. The friction members are interleaved plates which can create a partial friction state and a fully locked state of the front differential through application of axial pressure force. The spline mounting of the inner and outer rings allows axial movement so the axial pressure force application is more accurate despite manufacturing tolerances. A ball bearing is arranged between the differential housing and the ring gear joinder. The ball bearing is connected to the differential housing by a clearance fit which allows the ball bearing to move axially relative to the differential housing.