All-Terrain Vehicle Starting Protector With Stepless Torque Limiting

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Solution Overview

Problem

Existing all-terrain vehicle starting systems face issues with complex torque protectors that cannot be steplessly adjusted, leading to potential damage of starting motors due to high torque and speed when the engine reverses, and hybrid engines experience large starting torque and resistance.

Innovation Solution

A starting protector for all-terrain vehicles featuring a shaft, driven and driving wheels, a friction piece, and a compressing assembly that allows the wheels to slip when excessive torque is applied, preventing damage to the starting motor and engine components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a traditional torque protector is used to prevent starting motor damage, then the starting motor is protected from damage, but the structure becomes complex and torque cannot be steplessly adjusted

Engineering Contradiction:

Improvestarting motor protectionVSAvoidtorque protector structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

A friction piece is introduced as an intermediary element between the driving wheel and driven wheel. This friction piece, when compressed by a compressing assembly, creates controllable friction that allows stepless torque adjustment while protecting the starting motor. The friction piece acts as a mediator that enables smooth torque limitation without complex mechanical structures.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces complex mechanical torque limiting mechanisms with a friction-based compression system. The compressing assembly uses elastic deformation and friction forces instead of traditional mechanical clutches or governors, simplifying the structure while enabling continuous torque adjustment through compression force control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Productivity

If the transmission system uses a large speed ratio to start the engine, then the starting motor can rotate the engine, but reverse rotation causes extremely high torque and speed that may damage the motor

Engineering Contradiction:

Improveengine starting capabilityVSAvoidstarting motor durability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent converts the harmful reverse rotation effect into a beneficial protective mechanism. When the engine rotates reversely, the friction piece and compressing assembly create controlled friction that limits the reverse torque and speed transmitted to the starting motor, transforming what would be damaging reverse rotation into a self-protecting mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The compressing assembly pre-compresses the friction piece to create a cushioning effect before reverse rotation occurs. This pre-established friction force acts as a buffer that absorbs and limits extreme torque spikes during reverse rotation, protecting the starting motor from damage before the harmful effects can fully manifest.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Adaptability or versatility

If the hybrid engine uses a starting motor to drive both the engine and electric generator, then the system is integrated, but large starting torque and resistance are generated

Engineering Contradiction:

Improvehybrid engine functionalityVSAvoidstarting torque and resistance

Core Design Contradiction:

Adaptability or versatilityVSForce

Solution Approach 1:

The friction piece serves as a mediator that decouples the direct rigid connection between the starting motor and the hybrid engine components. By introducing friction-based slip capability, it allows the starting motor to drive both the engine and electric generator while limiting peak torque transmission, reducing starting resistance and protecting the system from excessive force.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 ensures synchronous rotation of the driving and driven wheels, preventing damage by allowing them to slip when excessive torque is encountered, thus protecting the starting motor and engine components.

Implementation Method 1

the friction piece and the compressing assembly, the friction force may be generated between the driving wheel and the driven wheel as well as between the friction piece and the driving wheel

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentEP3910208B1All-terrain vehicle and starting protector for all-terrain vehicle

Publication Date: 2025.09.10 SEGWAY TECH CO LTD

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AI summary

A starting protector (50) for an all-terrain vehicle is provided and includes a shaft (24), a driven wheel (220) fitted over the shaft (24) and comprising a tooth portion (2200) connected with an engine (30), a sleeving portion (2201) and a locking portion (2202); a driving wheel (221) fitted over the sleeving portion (2201) with one side attached to the tooth portion (2200) and connected with a starting motor (10); a friction piece (222) fitted over the sleeving portion (2201), synchronously rotating with the sleeving portion (2201), and attached to the other side of the driving wheel (221), and when starting torque of the engine (30) exceeds a preset value, the driving wheel (221) and the friction piece (222) slipping relatively; and a compressing assembly (25) fitted over the sleeving portion (2201) and the locking portion (2202) to compress the friction piece (222) and the driving wheel (221).