Motorcycle Supercharger Driveshaft Locking-Taper Interface for Vibration Wear

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Solution Overview

Problem

Existing supercharger systems for motorcycle engines suffer from durability and longevity issues due to vibrational motion causing frictional contact between components, leading to rapid degradation and mechanical failure, and replacing components with more durable materials compromises engine efficiency.

Innovation Solution

A driveshaft assembly with a tapered distal portion and a flywheel drive pulley featuring a locking-taper interface, forming an interference fit with a self-locking taper angle of less than 12°, is used to minimize frictional contact and enhance durability while maintaining lightweight materials.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional cylindrical driveshaft and pulley interfaces are used, then assembly is simple, but vibrational motion causes frictional contact leading to rapid degradation and mechanical failure

Engineering Contradiction:

Improvedurability and longevityVSAvoidinterface geometry complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies asymmetry by transitioning from a traditional cylindrical (symmetric) driveshaft-pulley interface to a tapered (asymmetric) interface. The tapered interface has a self-locking taper angle of less than 12 degrees, which creates an asymmetric geometry that prevents relative motion between components during vibrational operation, thereby eliminating frictional contact and improving durability without significantly complicating the assembly process

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

The patent changes the geometric parameters of the driveshaft-pulley interface by introducing a specific taper angle (less than 12 degrees). This parameter change transforms the interface from a cylindrical configuration prone to frictional degradation to a tapered configuration with self-locking properties that resist vibrational motion and prevent mechanical failure

Inventive Principle:

Principle #35Parameter changes

2Reliability

If more durable materials are used to replace existing components, then durability improves, but engine efficiency is compromised

Engineering Contradiction:

Improvecomponent durabilityVSAvoidengine efficiency

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent converts the harmful effect of vibrational motion, which traditionally causes frictional degradation, into a beneficial self-locking mechanism. The tapered interface geometry is designed so that vibrational forces naturally press the components together along the taper, creating a self-locking effect that prevents relative motion and eliminates wear, thereby improving durability without requiring heavier or less efficient materials

Inventive Principle:

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

3Reliability

If components are designed to resist vibrational motion, then frictional contact is reduced, but component design complexity increases

Engineering Contradiction:

Improveresistance to frictional degradationVSAvoidcomponent design complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent uses asymmetric tapered geometry to inherently resist vibrational motion. The taper angle of less than 12 degrees creates a self-locking configuration where the normal force generated during vibration presses the components together, preventing relative motion and frictional degradation without requiring additional complex features or mechanisms

Inventive Principle:

Principle #4Asymmetry

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 significantly improves the durability and longevity of supercharger systems by reducing frictional contact between components, maintaining engine efficiency, and preventing mechanical failure.

Implementation Method 1

forming a locking-taper interface that minimizes frictional contact between components

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

a driveshaft defining a tapered distal portion, and a flywheel drive pulley defining a tapered central bore configured to receive the tapered distal portion of the driveshaft to form a locking-taper interface

Methodology Applied

Scientific EffectInterference fit: Mechanical Fastener

Data Source

PatentUS12404800B1Motorcycle-engine supercharger

Publication Date: 2025.09.02 GILBYS STREET DEPT

AI summary

A driveshaft assembly for a motorcycle supercharger includes: an elongated driveshaft defining a tapered distal portion, and a flywheel drive pulley defining a tapered central bore. The tapered central bore of the drive pulley is configured to receive the tapered distal portion of the driveshaft to form a locking-taper interface between the driveshaft and the flywheel drive pulley, thereby substantially increasing the durability and longevity of the supercharger. The enhanced driveshaft assembly may be retro-fitted onto an existing supercharger system, or may be part of a new or custom supercharger installation.