Motorcycle Luggage Case With Stepless Spindle Volume Adjustment

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Solution Overview

Problem

Existing containers for single-track motor vehicles lack continuous volume adjustment and aerodynamic design due to the necessity of a straight-line gear mechanism and limited two-state operation.

Innovation Solution

A container comprising a first and second hard-shell element with a spindle system using an endless toothed belt, spindles, spindle nuts, and toothed belt pulleys, allowing continuous adjustment between retracted and extended positions, enabling an aerodynamic design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a gear mechanism is used for width adjustment, then the container can be adjusted between retracted and extended positions, but the design cannot achieve aerodynamic shape and only two discrete states are possible

Engineering Contradiction:

Improvevolume adjustment capabilityVSAvoidaerodynamic design

Core Design Contradiction:

Adaptability or versatilityVSShape

Solution Approach 1:

The patent replaces the traditional gear mechanism with a spindle system consisting of a spindle, spindle nut, and toothed belt. This substitution eliminates the need for straight-line gear arrangements, enabling aerodynamic container shapes while providing continuous width adjustment capability between retracted and extended positions.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention transitions from a two-state discrete adjustment system to a continuous dynamic adjustment system. The spindle mechanism allows the second container element to be positioned at any width between retracted and extended, enabling smooth volume variation and aerodynamic profiling rather than fixed discrete positions.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If a gear mechanism is used for width adjustment, then the container can be adjusted between two positions, but continuous volume adjustment is not possible

Engineering Contradiction:

Improvevolume adjustment capabilityVSAvoidadjustment mechanism complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent replaces complex multi-stage gear mechanisms with a simpler spindle system comprising a spindle, spindle nut, and toothed belt. This substitution achieves continuous adjustment capability while reducing mechanical complexity compared to traditional gear-based two-stage systems.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Strength

If hard-shell elements are used for the container, then structural strength is improved, but aerodynamic design is compromised due to gear mechanism requirements

Engineering Contradiction:

Improvecontainer structure strengthVSAvoidaerodynamic design

Core Design Contradiction:

StrengthVSShape

Solution Approach 1:

The patent replaces straight-line gear mechanisms with a spindle and toothed belt system that can be integrated into hard-shell container structures without compromising aerodynamic shaping. The spindle mechanism allows curved and streamlined hard-shell designs while maintaining structural strength and continuous adjustment capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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

Provides a hard-shelled container with stepless width adjustment and an aerodynamic appearance by utilizing a spindle system for smooth volume adjustment.

Implementation Method 1

The toothed belt engages with the toothed belt pulley to transmit motion, relying on friction between the belt teeth and pulley teeth for effective power transmission

Methodology Applied

Scientific EffectFriction: Friction

Implementation Method 2

The spindle system comprises at least one spindle and at least one spindle nut, where the spindle nut converts rotational movement of the spindle into linear displacement of the second container element

Methodology Applied

Scientific EffectScrew mechanism: Screw

Data Source

PatentEP4416042B1Container for a single-track motor vehicle

Publication Date: 2026.03.18 BAYERISCHE MOTOREN WERKE AG

Figure 1a~1b
Figure 2
Figure 3

AI summary

The invention relates to a container (1), in particular a top case or a side case, for a single-track motor vehicle, comprising a first container element (2) and a second container element (3). The first container element (2) and the second container element (3) are a hard shell element in particular, wherein the first container element (2) can be secured to the single-track motor vehicle, and the second container element (3) has an opening/cover for a piece of luggage. The first container element (2) and the second container element (3) are arranged so as to overlap one over the other such that the second container element (3) can be moved on the first container element (2) between a first retracted position and a second extended position and the volume of the container (1) can be modified, A spindle system (4) is arranged on the inner face (21) of the first container system (2) and the inner face (31) of the second container element (3), and the second container element (3) can be continuously adjusted and fixed between the first retracted position and the second extended position by means of the spindle system (4).