Split Rear Axle Locking Mechanism for OHV Tire Wear Reduction

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Solution Overview

Problem

Off-highway vehicles (OHVs) experience unwanted wear on rear wheels due to different wheel track paths during turns on pavement, as rear wheels typically rotate at the same speed, leading to sliding and difficulty in maneuvering on hard surfaces.

Innovation Solution

A split axle system with a locking mechanism allowing the first and second shafts to rotate together at the same speed in a locked state and independently in an unlocked state, enabling adjustable wheel speed synchronization.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If rear wheels are constrained to rotate at the same speed, then off-road traction is improved, but pavement tire wear increases during turns

Engineering Contradiction:

Improveoff-road tractionVSAvoidtire wear

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The axle system transitions from a fixed same-speed rotation constraint to a dynamic system where the locking mechanism can be engaged or disengaged based on operating conditions. When locked, both shafts rotate together for off-road traction; when unlocked, they rotate independently to reduce pavement tire wear during turns

Inventive Principle:

Principle #15Dynamics

2Stability of the object's composition

If rear wheels rotate at the same speed, then vehicle stability is improved, but turning maneuverability on pavement deteriorates

Engineering Contradiction:

Improvevehicle stabilityVSAvoidturning maneuverability

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The system dynamically adjusts between locked and unlocked states. The locking mechanism allows the operator to engage same-speed rotation for stable off-road driving and disengage it for easier pavement turning, where independent shaft rotation reduces resistance during turns

Inventive Principle:

Principle #15Dynamics

3Ease of operation

If a locking mechanism is added to allow independent shaft rotation, then pavement turning is improved, but device complexity increases

Engineering Contradiction:

Improvepavement turningVSAvoidaxle mechanism complexity

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The axle is segmented into two independent shafts (first shaft with sleeve, second shaft with inserted portion) that can rotate independently or together. This segmentation allows the locking mechanism to control only the coupling between shafts rather than redesigning the entire axle system

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The inserted portion of the second shaft is nested within the sleeve of the first shaft. When the locking mechanism engages, these nested components lock together to rotate as one unit; when disengaged, they rotate independently, providing the desired functionality with minimal added complexity

Inventive Principle:

Principle #7Nested doll (Nesting)

Data Source

PatentUS12427806B2Axle for an off-highway vehicle (“OHV”)

Publication Date: 2025.09.30 GOATISH LLC

AI summary

An apparatus for a split axle includes a split axle of a vehicle with a first shaft and a second shaft. The first shaft includes a sleeve and the second shaft includes an inserted portion that is inserted into the sleeve of the first shaft. The inserted portion is rotatable within the sleeve. The apparatus includes a locking mechanism that includes a locked state and an unlocked state. The first shaft and the second shaft rotate together at a same speed when the locking mechanism is in the locked state and the first shaft and the second shaft rotate independently when the locking mechanism is in the unlocked state.