Movable Bicycle Frame Pivot Joint for Tunable Anti-Squat

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Solution Overview

Problem

Existing anti-squat systems in bicycle frames are difficult to adapt to the rider's needs and driving situations, leading to inefficiencies in propulsion and energy loss due to squat phenomena.

Innovation Solution

A bicycle frame with a movable pivot joint that allows the position of the pivot point to be adjusted, enabling customizable anti-squat settings without significantly affecting the static geometry or suspension characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the pivot point position is fixed in existing anti-squat systems, then the structure is simple, but the adaptability to rider needs and driving situations is poor

Engineering Contradiction:

Improveadaptability of anti-squat systemVSAvoidcomplexity of pivot joint system

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent makes the previously fixed pivot point dynamically adjustable through a movable pivot joint that can change its position along the seat tube. This allows the anti-squat characteristics to be adapted to different rider needs and driving situations while maintaining a relatively simple structural implementation through guided linear movement.

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the pivot point position is changed to adjust anti-squat, then the adaptability improves, but the static geometry and suspension characteristics are affected

Engineering Contradiction:

Improvecustomizability of anti-squat settingsVSAvoidstatic geometry stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent segments the pivot joint into two independent functional aspects: the rotation axis that maintains fixed static geometry, and the movable position along the seat tube that adjusts anti-squat characteristics. This segmentation allows adjustment of anti-squat without significantly affecting the overall static geometry and suspension characteristics of the bicycle frame.

Inventive Principle:

Principle #1Segmentation

3Ease of operation

If the pivot joint is made movable to change pivot point position, then the anti-squat can be customized, but the device complexity increases

Engineering Contradiction:

Improveease of anti-squat adjustmentVSAvoidcomplexity of movable pivot joint

Core Design Contradiction:

Ease of operationVSDevice complexity

Solution Approach 1:

The patent introduces a guide structure as an intermediary element that constrains the pivot joint to move only along a predetermined linear path along the seat tube. This intermediary guide mechanism simplifies the overall system by eliminating the need for complex multi-degree-of-freedom adjustment mechanisms, making the anti-squat adjustment easier to implement while controlling device complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentEP4678526A1Bicycle frame and bicycle

Publication Date: 2026.01.14 CANYON BICYCLES

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AI summary

The invention relates to a bicycle frame (10) comprising a main frame (12), a rear triangle (14) movable relative to the main frame (12) about a pivot point (34), and a pivot joint (30) forming the pivot point (34), wherein the pivot joint (30) is displaceable to change the position of the pivot point (34). The invention further relates to a bicycle with such a bicycle frame (10).