Motorcycle Fork Adapter for Rake Adjustment

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Solution Overview

Problem

Existing motorcycle rake adjustment methods often result in low structural rigidity and require complex modifications or new components, making it difficult to adjust the steering rake of existing motorcycles without compromising safety or requiring factory-level manufacturing processes.

Innovation Solution

A retrofit motorcycle fork adapter that uses bearing race adapters to modify the rake by inserting them into existing bearing races, utilizing existing flats on the steering neck to secure new bearing cups, thereby allowing adjustment of the steering head angle without cutting existing materials and maintaining structural integrity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If traditional rake adjustment methods are used (creating new steering neck or complex modifications), then rake angle can be changed, but structural rigidity decreases and device complexity increases

Engineering Contradiction:

Improverake angle adjustment capabilityVSAvoidstructural rigidity

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The bearing cup adapter is nested within the existing bearing race seat in the steering neck. The adapter contains internal bearing races that hold the original bearings, creating a nested structure where the new adapter component houses the existing bearing assembly, allowing rake modification without external modifications

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The bearing cup adapter serves as an intermediary component between the existing steering neck and the fork assembly. It mediates the rake angle change by providing an offset bearing surface that redirects the steering axis while maintaining compatibility with existing components

Inventive Principle:

Principle #24Intermediary (Mediator)

2Adaptability or versatility

If traditional rake adjustment methods are used (cutting existing materials or factory manufacturing), then rake angle can be changed, but ease of manufacture deteriorates

Engineering Contradiction:

Improverake angle adjustment capabilityVSAvoidinstallation simplicity

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The bearing cup adapter is pre-manufactured with the correct offset geometry and bearing race seats before installation. The adapter comes ready-to-install with bearings pre-mounted in the offset bearing races, eliminating the need for field manufacturing or complex assembly procedures

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The bearing cup adapter is designed as a universal retrofit component that can be installed in existing steering necks with standard bearing race seats. It provides multiple functions: maintaining original bearing compatibility, providing rake angle offset, and requiring no modification to the existing steering neck

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11618523B2Motorcycle fork adapter

Publication Date: 2023.04.04 COSTA VINCE

AI summary

A motorcycle fork has an upper tree; a lower tree; a steering neck; and a steering stem. The steering stem is connected to the upper tree at a steering stem upper end, and is connected to the lower tree at a steering stem a lower end, and passes through the steering neck. The steering stem is oriented to a steering neck centerline in a first mode. A neck upper bearing race seat is formed on an upper portion of the steering neck. A neck lower bearing race seat is formed on a lower portion of the steering neck. An upper bearing race receives an upper bearing. The upper bearing race is mounted in the neck upper bearing race seat in the first mode. A lower bearing race receives a lower bearing. The lower bearing race is mounted in the neck lower bearing race seat in the first mode.