Straddle Vehicle Brake System with Segmented Interlocking Control

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing straddle type vehicle brake systems do not allow independent actuation of the rear brake, requiring the rear brake to be actuated together with the front brake, which limits control over the vehicle's position and locking of the rear wheel based on road or travel conditions.

Innovation Solution

A straddle type vehicle brake system comprising separate front and rear brake operating devices and an interlocking brake operating device that enables both interlocked and independent operation of the front and rear brakes, utilizing an equalizer to divide and transfer operating forces between the brake wires and master cylinders.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the rear brake operating lever is coupled with an equalizer connected to both rear brake cable and interlocking cable, then the front and rear brakes can work in an interlocked manner, but the rear brake cannot be actuated alone

Engineering Contradiction:

Improveinterlocked brake operationVSAvoidindependent rear brake actuation

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The brake operating system is segmented into three independent operating devices: a front brake operating device (first operating device), a rear brake operating device (second operating device), and an interlocking brake operating device (third operating device). This segmentation allows each device to independently control specific brake functions, enabling both interlocked operation (via the third device) and independent rear brake actuation (via the second device), thereby resolving the contradiction between adaptability and ease of operation.

Inventive Principle:

Principle #1Segmentation

2Ease of operation

If the property setting spring biases the interlocking cable to prevent front brake actuation by the rear brake operating lever, then only the rear brake can be actuated with light force, but the front brake cannot be actuated with the rear brake operating lever even when sufficient force is applied

Engineering Contradiction:

Improvelight force rear brake actuationVSAvoidfront brake actuation capability

Core Design Contradiction:

Ease of operationVSAdaptability or versatility

Solution Approach 1:

The braking functions are segmented into separate operating devices with distinct functions. The second operating device (rear brake operating lever) is dedicated to rear brake control and is decoupled from the front brake system through the removal of the interlocking cable connection. The third operating device (interlocking brake operating device) is specifically designed to activate both front and rear brakes simultaneously when needed. This segmentation resolves the contradiction by allowing light force rear brake actuation while maintaining front brake actuation capability through a separate dedicated device.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The third operating device serves as an intermediary mechanism that enables simultaneous activation of both front and rear brakes through a single operation. This intermediary device includes an equalizer that distributes the operating force to both the front brake cable and rear brake cable, allowing the rider to perform emergency stopping or controlled sliding maneuvers by actuating both brakes together without modifying the independent rear brake operation.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Adaptability or versatility

If the interlocking cable connects the rear brake operating lever to the front brake operating lever, then the front brake can be actuated through the rear brake operating lever, but the rear brake cannot be actuated alone

Engineering Contradiction:

Improvefront brake actuation through rear leverVSAvoidindependent rear brake control

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The brake control system is divided into three separate operating devices, each with specific functions. The second operating device (rear brake operating lever) is segmented to control only the rear brake through direct connection to the rear brake cable, eliminating the interlocking cable connection. The third operating device (interlocking brake operating device) is segmented to control both brakes simultaneously through an equalizer mechanism. This segmentation resolves the contradiction by allowing independent rear brake control while providing a separate mechanism for front brake actuation when needed.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The interlocking cable connection between the rear brake operating lever and front brake operating lever is extracted (removed) from the system. This extraction eliminates the constraint that prevented independent rear brake actuation. The front brake actuation function is then provided by a separate third operating device that can be engaged when simultaneous front and rear brake application is desired, such as during emergency stopping or controlled sliding maneuvers.

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentEP2682334B1Straddle type vehicle brake system and straddle type vehicle

Publication Date: 2018.12.12 YAMAHA MOTOR CO LTD

Figure 1
Figure 2
Figure 3

AI summary

A brake system (6) includes: a front brake (31); a rear brake (41); a right brake lever (50) for operating the front brake (31); a left brake lever (60) for operating the rear brake (41); and brake pedal (70) for operating the front brake (31) and rear brake (41) such that the front brake (31) and rear brake (41) work in an interlocked manner.