Straddle Vehicle Swing Arm Case with Heat Dissipation Openings

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Solution Overview

Problem

In straddle-type vehicles with electric components installed on the swing arm, the motor temperature rises due to trapped heat, leading to decreased performance and potential accessibility issues for the driver.

Innovation Solution

The straddle-type vehicle design includes a swing arm with a case that houses the electric component, such as a motor, and features openings on multiple surfaces to allow for heat dissipation, positioning the motor centrally in front of the rear wheel to minimize accessibility and maximize cooling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the motor is covered with a cover to prevent driver access, then safety is improved, but heat dissipation deteriorates and motor temperature rises

Engineering Contradiction:

ImprovesafetyVSAvoidmotor temperature

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The cover is designed with selective opening portions that provide localized heat dissipation pathways while maintaining overall enclosure. This allows different regions of the cover to have different properties: most areas remain closed for safety, while specific openings allow heat escape.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The design converts the potential harm of trapped heat into a beneficial controlled heat dissipation system. The opening portions are strategically positioned to allow heat to escape while maintaining driver inaccessibility, turning the heat management problem into a solved feature.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Ease of operation

If the motor is completely enclosed in a case, then driver accessibility is reduced, but heat trapping occurs and performance decreases

Engineering Contradiction:

Improvedriver accessibilityVSAvoidmotor performance

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The case is designed with selective opening portions that provide localized access or ventilation while maintaining overall enclosure. This allows different regions of the case to have different properties: most areas remain enclosed for protection, while specific openings allow heat escape or controlled access.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The design converts the potential harm of complete enclosure (heat trapping) into a beneficial controlled ventilation system. The opening portions are strategically positioned to allow heat to escape while maintaining driver inaccessibility to critical components, turning the enclosure problem into a solved feature.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Temperature

If openings are added to the case for heat dissipation, then heat escape is improved, but driver accessibility to the motor increases

Engineering Contradiction:

Improveheat dissipationVSAvoiddriver accessibility

Core Design Contradiction:

TemperatureVSReliability

Solution Approach 1:

The openings are positioned in specific locations where heat dissipation is prioritized but driver access is minimized. The opening portions are designed to allow thermal energy escape while maintaining physical barriers or positioning that prevent driver contact with the motor.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The design converts the potential harm of openings (increased accessibility to driver) into a beneficial heat dissipation feature. The openings are strategically positioned and sized to allow heat escape while the overall case structure maintains driver inaccessibility to critical components.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

This configuration effectively reduces motor temperature, maintains performance, and ensures safety by allowing heat to escape through the openings while keeping the motor out of direct driver access.

Implementation Method 1

the case is formed with an opening through which the electric component is exposed to the outside... By forming the opening in the case, the heat of the electric component is easily released from the opening of the case

Methodology Applied

Scientific EffectHeat dissipation: Convection

Data Source

PatentEP4530175A1Straddle-type vehicle swing arm with case to house an electric component

Publication Date: 2025.04.02 SUZUKI MOTOR CORP

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AI summary

A straddle-type vehicle (1) includes a swing arm (40) swingably supported by a vehicle body frame (10). The swing arm (40) includes a pivot (43, 44) configured to be coupled to the vehicle body frame (10) at a front end portion of the swing arm (40), a rear wheel support portion (52) configured to rotatably support a rear wheel (56) at a rear end portion of the swing arm (40), and a case (49) configured to house an electric component (31) in front of the rear end portion of the swing arm (40). The case is formed with an opening (55 to 58) through which the electric component (31) is exposed to the outside.