Friction Wheel Drive Assembly With Integrated Motor Mounting
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional friction type drive devices for inverted pendulum type mobile bodies require additional space due to the size of their components, leading to inefficiencies in mounting and potential extra space requirements, especially when electric motors of larger sizes are used.
Innovation Solution
A rotary drive device with a main wheel and opposing drive assemblies, where each drive assembly includes a motor, a motor case, and a drive force transmission system with driving rollers that transmit the motor's drive force to the main wheel, allowing for compact attachment to the mobile body without extending the attachment space.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional friction type drive device is fixedly mounted using left and right mount members, then the drive device can be securely attached to the lower frame, but additional space is required for the mount members and extra space may be generated between the mount member and electric motor
Solution Approach 1:
The patent combines the motor housing with the mount member into a single integrated structure. The motor housing directly serves as the mounting component that attaches to the lower frame, eliminating the need for separate mount members. This merging of functions reduces the overall attachment space while maintaining secure attachment reliability.
Solution Approach 2:
The motor housing is designed to perform multiple functions: it encloses the electric motor, provides structural support, and serves as the mounting interface with the lower frame. By making the motor housing universal for both motor containment and mounting purposes, the patent eliminates the need for additional dedicated mount members, thereby reducing attachment space requirements.
2Power
If an electric motor having a size that does not fit inside the cylindrical portion of the drive disk is mounted, then the motor can accommodate larger power requirements, but a mount member having a larger size is required, increasing the interval between attachment positions
Solution Approach 1:
The patent reconfigures the mounting arrangement by having the motor housing extend axially from the drive disk assembly. Instead of increasing the radial size of mount members, the motor housing utilizes the axial dimension for mounting. This dimensional change allows larger motors to be accommodated without increasing the interval between attachment positions on the lower frame.
Solution Approach 2:
The motor housing is designed with flexible positioning capabilities along the axial direction, allowing it to adapt to different motor sizes while maintaining consistent attachment intervals. The housing can be positioned at optimal locations to accommodate various motor dimensions without requiring changes to the attachment point spacing on the lower frame.
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 reduces the space required for attachment and improves the stability and efficiency of the mobile body by allowing for accurate positioning of the drive assemblies, even with larger motors, while minimizing the expansion of the attachment space along the axial direction.
Implementation Method 1
The plurality of first driving rollers contact at least a portion of the plurality of driven rollers from one side of the rotary drive device in the axial direction. The first drive force transmission rotates to transmit the drive force of the first motor to the main wheel via the plurality of first driving rollers.
Data Source
AI summary
A rotary drive device in a mobile body includes a main wheel and a pair of drive assemblies opposing each other and each driving the main wheel. The main wheel includes driven rollers. One of the pair of drive assemblies includes a motor, a motor case, a drive force transmission, and driving rollers. The driving rollers are in the drive force transmission along a circumferential direction, and contact at least a portion of the driven rollers from one side of the rotary drive device of the axial direction. The drive force transmission rotates to transmit a drive force of the motor to the main wheel via the driving rollers. At least a portion of the motor case opposes at least a portion of the driving rollers in the axial direction.