Straddle Vehicle Brake Link Mechanism for Compact Power Divider

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Solution Overview

Problem

Existing straddle type vehicle interlocking brake systems have complex structures within the power divider, leading to a large number of components and difficulty in reducing the size of the power divider.

Innovation Solution

A straddle type vehicle interlocking brake system utilizing a single link with an elastic support and an interlocking brake wire to actuate both front and rear brakes, simplifying the construction and minimizing the number of components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a rotational lever is rotatably connected with the equalizer lever in the power divider, then the front and rear brakes can work in an interlocked manner, but the structure inside the power divider becomes highly complicated and the number of components increases

Engineering Contradiction:
Improveinterlocking brake functionVSAvoidpower divider structure
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the functions of the equalizer lever and rotational lever into a single integrated lever structure. This unified lever directly connects the front and rear brake operating devices, eliminating the need for separate rotational connection components and simplifying the power divider structure while maintaining the interlocking brake function.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The integrated lever serves multiple functions simultaneously: it acts as both the equalizer lever for distributing braking force and the rotational lever for sequential brake activation. This multi-functional design reduces the total number of components needed in the power divider system.

Inventive Principle:
Principle #6Universality (Multi-functionality)

2Reliability

If multiple components are used in the power divider to achieve interlocking brake operation, then the front and rear brakes can be actuated in sequence, but the size of the power divider increases

Engineering Contradiction:
Improvesequential brake actuationVSAvoidpower divider size
Core Design Contradiction:
ReliabilityVSVolume of moving object

Solution Approach 1:

By merging the equalizer lever and rotational lever into one integrated component, the patent significantly reduces the volume occupied by the power divider. The sequential actuation function is achieved through the integrated lever's geometry and connection points rather than through multiple separate components.

Inventive Principle:
Principle #5Merging (Combining)

Solution Approach 2:

The integrated lever is designed with specific connection points for front and rear brakes positioned at different locations along its length. This segmentation of connection points allows sequential brake actuation through the lever's rotation, eliminating the need for additional intermediate components and reducing overall power divider size.

Inventive Principle:
Principle #1Segmentation

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 system achieves a simple and compact interlocking brake mechanism that effectively activates both front and rear brakes with a reduced number of components, enhancing the overall design efficiency.

Implementation Method 1

a support for elastically supporting the link at the fulcrum such that, when an amount of load that is at a certain value or larger acts on the link in a direction crossing a longitudinal direction thereof, the fulcrum moves in this direction

Methodology Applied
Scientific EffectElastic support: Elasticity

Data Source

PatentEP2684788B1Straddle type vehicle interlocking brake system and straddle type vehicle
Publication Date: 2015.07.01 YAMAHA MOTOR CO LTD
  • EP2684788B1 patent drawingFigure 1
  • EP2684788B1 patent drawingFigure 2
  • EP2684788B1 patent drawingFigure 3

AI summary

A brake system (6) includes: a front brake mechanism (30); a rear brake mechanism (40); a front brake wire (74); a rear brake wire (75); a link (81); a support (82); and an interlocking brake wire (72). The link (81) is rotatable around a fulcrum on one end thereof as measured in a longitudinal direction thereof. The support (82) elastically supports the link (81) at the fulcrum. The interlocking brake wire (72) is connected with the link (81) so as to pull the front brake wire (74) and rear brake wire (75). The front brake wire (74), the interlocking brake wire (72), and the rear brake wire (75) are connected with the link (81) in this order, starting from the end of the link with the support (82), as measured in a longitudinal direction of the link (81).