Saddled Vehicle Transmission Layout for Protected Shift Detection

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Solution Overview

Problem

Conventional saddled vehicle transmission designs require a larger vehicle body frame, making it difficult to maintain a rider's posture and expose the speed change detection device, which is hard to protect.

Innovation Solution

The transmission design positions the operation pedal on the outer side and the speed change detection device on the inner side of the vehicle body frame, with a link member coupling them, allowing the frame to be centered and protecting the detection device from external elements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the detection device is arranged on the outer side of the vehicle body frame, then the operation pedal can be easily accessed, but the detection device becomes externally exposed and difficult to protect

Engineering Contradiction:

Improveaccessibility of operation pedalVSAvoidexposure to dust, mud, and debris

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The detection device is arranged in the vehicle width direction (lateral dimension) rather than only in the longitudinal dimension, positioning it on the inner side of the vehicle body frame while maintaining operational accessibility through the link member mechanism

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

2Stability of the object's composition

If the operation pedal and detection device are attached to a base plate on the vehicle body frame, then the structure is stable, but the vehicle body frame must swell outward making it difficult to knee-grip

Engineering Contradiction:

Improvestructural stabilityVSAvoidknee-grip capability

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

The detection device is separated from the operation pedal and mounted independently on the vehicle body frame, allowing the operation pedal to be positioned for optimal knee-grip while the detection device is protected on the inner side

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

A link member acts as an intermediary between the operation pedal and the detection device, transmitting the operating force while allowing spatial separation between these components

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS11072393B2Transmission for saddled vehicle

Publication Date: 2021.07.27 HONDA MOTOR CO LTD

AI summary

A transmission for a saddled vehicle with which a posture of a rider is easily held during driving of the vehicle and a speed change detection device can be protected. A step for the driver extends outward in a vehicle width direction from a lower frame; a gear change pedal is turn-operated by a rider's foot for speed change; and a link for detection is coupled with the gear change pedal. A speed change detection device is coupled with a tip of the link for detection, and detects a speed change operation by the gear change pedal. The gear change pedal is arranged on an outer side of a lower frame in the vehicle width direction, and the speed change detection device is arranged on an inner side of pivot frames and the lower frame in the vehicle width direction.