Friction Drive Roller Groove Layout for Dense Wheel Assembly
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Solution Overview
Problem
The existing frictional drive units for inverted pendulum vehicles face challenges in arranging drive rollers with high density and facilitating their attachment due to the need for axial space and complex insertion operations.
Innovation Solution
The frictional drive unit design includes drive disks with bearing grooves that receive roller shafts from the side, allowing for high-density arrangement and simplified attachment, with inclined portions and recessed structures to enhance stability and prevent roller shafts from falling off, enabling efficient support and rotation of drive rollers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If roller shafts are inserted into bearing holes in the axial direction of drive disks, then the drive rollers can be supported to rotate, but axial space is required for insertion which reduces the density of drive roller arrangement
Solution Approach 1:
The invention changes the insertion direction from the axial direction to the radial direction of the drive disk. The bearing grooves are formed on the radial outer circumferential surface, allowing roller shafts to be inserted from the radial direction rather than requiring axial space. This dimensional change enables higher density arrangement of drive rollers while maintaining rotational support functionality.
2Reliability
If roller shafts are inserted into bearing holes in the axial direction, then drive rollers can be supported, but complex insertion operations are required for multiple drive rollers increasing workload
Solution Approach 1:
By changing the insertion direction to radial and forming bearing grooves that open toward the main wheel, the invention enables simple fitting operations. The grooves are accessible from the radial direction, allowing roller shafts to be easily inserted without complex axial alignment operations, significantly reducing the workload for attaching multiple drive rollers.
Solution Approach 2:
The bearing grooves are pre-formed on the drive disk with openings facing the main wheel direction. This preliminary preparation of the groove structure eliminates the need for complex insertion operations during assembly, as roller shafts can be directly fitted into the pre-positioned grooves from the radial direction.
3Quantity of substance
If bearing grooves are formed on the radial outer circumferential surface opening toward the main wheel, then drive rollers can be arranged with high density, but roller shafts may fall off without proper retention structure
Solution Approach 1:
The invention applies local quality by creating specific groove depth and cross-sectional shape characteristics at the bearing groove location. The grooves are formed to a depth that provides adequate retention, and their cross-sectional shape is optimized to securely hold the roller shafts while allowing radial insertion. This localized structural optimization ensures roller shafts remain retained without requiring additional retention components.
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 allows for high-density arrangement of drive rollers and simplifies the attachment process, stabilizing the rotational direction and preventing roller shafts from falling off, thus improving operational efficiency and density in the drive unit.
Implementation Method 1
a plurality of drive rollers (5) provided on an outer circumferential portion of each drive disk and arranged at intervals in a circumferential direction of the drive disk, each drive roller being supported to rotate around an axis inclined relative to the circumferential direction of the drive disk
Data Source
AI summary
To provide a frictional drive unit that can arrange drive rollers with high density and facilitate an attachment operation of the drive rollers, a frictional drive unit 2 includes a pair of drive disks 4, a plurality of drive rollers 5 rotatably supported by an outer circumferential portion of each drive disk, a pair of actuators 8 configured to independently rotate the pair of drive disks, and an annular main wheel 7 arranged between the pair of drive disks and coming into contact with the drive rollers. Each drive roller includes a roller shaft 41 and a round roller body 42 provided on an intermediate portion of the roller shaft. Each drive disk includes plural pairs of bearing grooves 45 each receiving both ends of the roller shaft of each drive roller. Each bearing grooves open toward the main wheel.