Friction Drive Heat Dissipation via Rotatable Member
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Solution Overview
Problem
Existing friction drive devices for omni-directional vehicles face inefficiencies in heat dissipation and require significant space for electric motors and power transmission mechanisms, hindering compact design.
Innovation Solution
The friction drive device integrates an electric drive device with a strain wave gearing system, where the output member is fixedly attached to a rotatable drive member with a frustoconical design, allowing heat conduction and eliminating the need for a belt drive mechanism, enabling efficient heat dissipation and compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If electric motors and power transmission mechanism are placed above the wheel remote from rotatable drive members, then power transmission is achieved, but heat dissipation efficiency deteriorates and device volume increases
Solution Approach 1:
The patent merges the electric motor and power transmission mechanism directly with the rotatable drive member by fixing the output member of the electric drive device to the rotatable drive member. This integration eliminates the need for separate power transmission components like belt drive mechanisms, thereby reducing device volume while improving heat dissipation efficiency through direct thermal coupling between the motor and drive member.
Solution Approach 2:
The patent employs a nested configuration where the strain wave gearing device is positioned inside the frustoconical part of the rotatable drive member, and the electric motor is integrated within this structure. This nesting arrangement maximizes space utilization, reduces overall device volume, and facilitates efficient heat dissipation by allowing thermal energy to conduct through the nested components to the rotating drive member surface.
2Loss of energy
If electric motors and power transmission mechanism are integrated directly with rotatable drive member, then heat dissipation efficiency improves and device volume reduces, but manufacturing complexity increases
Solution Approach 1:
The patent segments the integrated drive system into distinct functional modules: the electric motor, the strain wave gearing device, and the rotatable drive member with frustoconical part. This segmentation allows each component to be manufactured separately using standard processes, then assembled together, thereby reducing overall manufacturing complexity despite the integrated design.
Solution Approach 2:
The rotatable drive member serves multiple functions simultaneously: it acts as the output shaft of the electric drive device, the housing for the strain wave gearing device, and the primary heat dissipation component. This multi-functionality reduces the total number of parts needed, simplifying manufacturing and assembly while achieving both compact size and efficient heat dissipation.
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 dissipates heat generated by the electric drive device, reducing the need for bulky power transmission systems and allowing for a highly compact design of both the friction drive device and the omni-directional vehicle.
Implementation Method 1
the heat of the electric drive device is transmitted to the rotatable drive member essentially by conduction, and the rotatable drive member effectively functions as a heat sink
Implementation Method 2
the rotatable drive member is rotated by the electric drive device... the rotatable drive member can function as a highly favorable and effective heat sink... heat generated from the electric drive device is favorably removed to the atmosphere
Data Source
AI summary
Heat generated by a drive source of a friction drive device such as an electric motor is allowed to efficiently dissipate to the atmosphere, and the friction drive device and an omni-directional vehicle using the same is designed in a highly compact manner. Left and right electric drive devices are placed on a central axial line of left and right rotatable drive members, and external teeth members serving as output members of the electric drive devices are directly connected to the respective rotatable drive members in a torque transmitting and heat transmitting relationship.