In-Wheel Disc Brake Scraper for Mud Debris Removal

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Solution Overview

Problem

Conventional straddle type vehicles with disc brakes face issues with mud and debris accumulation inside the wheel, leading to clogging and accelerated wear of brake pads, especially on rough terrain where high suspension stroke increases the likelihood of debris accumulation.

Innovation Solution

An all-terrain straddle type vehicle equipped with a disc brake and a scraper mechanism within the wheel, where the scraper's edge extends obliquely from upstream to downstream of the wheel's rotation direction, effectively scraping and directing debris away from the caliper, preventing clogging and reducing brake pad wear.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Power

If a disc brake is provided within the wheel, then braking performance is improved, but mud and debris easily clog the gap between the brake caliper and wheel, accelerating brake pad wear

Engineering Contradiction:

Improvebraking performanceVSAvoidbrake pad life

Core Design Contradiction:

PowerVSReliability

Solution Approach 1:

The scraper is positioned upstream of the brake caliper in the direction of wheel rotation, performing preliminary removal of mud and debris before they can reach and clog the brake caliper gap, preventing the harmful effect before it occurs

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The scraper extracts and removes mud and debris from the wheel interior surface, separating these harmful substances from the brake system environment, preventing them from entering the critical gap between the caliper and wheel

Inventive Principle:

Principle #2Taking out (Extraction)

2Ease of operation

If the caliper supporting portion is located radially outside to scrape off mud, then debris removal is improved, but the scraped debris accumulates inside the wheel, leading to eventual clogging

Engineering Contradiction:

Improvedebris removal capabilityVSAvoiddebris accumulation

Core Design Contradiction:

Ease of operationVSQuantity of substance

Solution Approach 1:

The scraper is positioned radially inside the wheel rather than radially outside, changing the spatial dimension of the scraping action. This internal positioning allows scraped debris to be directed outward and away from accumulation zones, preventing the buildup problem associated with external scraping

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Ease of operation

If a large suspension stroke is provided for rough terrain, then riding comfort is improved, but the depth of the wheel increases, making debris more likely to accumulate inside

Engineering Contradiction:

Improveriding comfortVSAvoiddebris accumulation likelihood

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The scraper is passively driven by the wheel's own rotation, using the wheel's motion to automatically remove debris without requiring additional active components or energy input, providing continuous self-cleaning service that adapts to varying suspension strokes and terrain conditions

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS8074776B2All-terrain vehicle

Publication Date: 2011.12.13 YAMAHA MOTOR CO LTD

AI summary

An all-terrain straddle type vehicle includes, inside a wheel, a disc rotor that rotates as the wheel rotates, a caliper for clamping the disc rotor to brake the rotation of the wheel, and a scraper for scraping out dirt, mud, sand, snow and other debris deposited on a rim of the wheel. An edge of a scraping surface of the scraper extends obliquely from upstream toward downstream of a rotation direction of the wheel with respect to a rotation plane of the wheel.