Integrated Stem-Brace Steering Assembly for Compact Micromobility Vehicles

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Solution Overview

Problem

Micromobility transit vehicles face challenges with steering assemblies that are bulky and heavy due to the need to accommodate varying load requirements, necessitating a design that reduces mass and packaging volume.

Innovation Solution

A steering assembly design featuring a fork, a steer tube, a stiffening brace, and a stem with a planar shear joint and pinch joint connection, along with a preload assembly to adjust headset bearing preload, which allows for a compact and robust mechanical connection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If traditional steering assembly designs are used to satisfy load requirements, then reliability is improved, but weight increases and packaging volume increases

Engineering Contradiction:

Improverobustness under loadVSAvoidsteering assembly mass

Core Design Contradiction:

ReliabilityVSWeight of moving object

Solution Approach 1:

The patent combines the stem and stiffening brace into a single integrated component that performs both functions: providing structural stiffness and connecting to the steer tube. This merging eliminates the need for separate mechanical connections and reduces overall mass while maintaining the required robustness under varying load conditions.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The integrated stem-stiffening brace assembly serves multiple functions simultaneously: it provides structural reinforcement, enables rotational movement within the headtube, and connects to the steer tube without requiring additional dedicated components. This multi-functionality reduces the total number of parts and overall mass.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If traditional steering assembly designs are used to satisfy load requirements, then reliability is improved, but packaging volume increases

Engineering Contradiction:

Improverobustness under loadVSAvoidsteering assembly packaging volume

Core Design Contradiction:

ReliabilityVSVolume of stationary object

Solution Approach 1:

By merging the stem and stiffening brace into a single integrated component, the patent reduces the overall packaging volume of the steering assembly. The combined structure occupies less space than separate components would require, while still providing the necessary structural robustness for varying load conditions.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If complex mechanical connections are used to secure the steering assembly, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improveconnection robustnessVSAvoidmechanical connection complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The integrated stem-stiffening brace assembly reduces mechanical connection complexity by eliminating the need for separate connections between these components. The single integrated structure requires fewer fasteners and connection points while maintaining connection robustness through its unified design.

Inventive Principle:

Principle #5Merging (Combining)

Data Source

PatentUS12403978B2Steering assembly for micromobility transit vehicles

Publication Date: 2025.09.02 LYFT INC

AI summary

In one embodiment, a micromobility transit vehicle may include a steering assembly. The steering assembly may include a steer tube configured to rotate within a headtube of the micromobility transit vehicle, and a stiffening brace positioned about the headtube. A stem may be coupled to the steer tube and the stiffening brace and configured to rotationally lock the stem and the stiffening brace together. A preload assembly may be coupled to the steering assembly and the stem and configured to adjust a preload of the steering assembly.