Drive Transmission Layout for Reliable Small-Module Rotation
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Solution Overview
Problem
Conventional drive transmission devices face issues with reliability in rotating a second rotatable member due to differences in diameter between convex and concave arcuate surfaces, leading to increased costs and size due to the need for improved accuracy and larger gear modules.
Innovation Solution
A drive transmission device with a first rotatable member and a second rotatable member, where the first member includes driving portions and a limiting portion with an arcuate shape to reliably rotate the second member, and the second member has driven portions and contact portions to ensure reliable engagement and rotation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the diameter difference between convex and concave arcuate surfaces is reduced to improve rotation reliability, then manufacturing precision and device complexity increase
Solution Approach 1:
A third rotatable member is introduced as an intermediary between the first and second rotatable members. This mediator transfers rotation from the first member to the second member, allowing the convex and concave arcuate surfaces to have different diameters without compromising rotation reliability. The third member acts as a buffer that decouples the dimensional constraints between the first and second members.
2Reliability
If larger gear modules are used to ensure reliable engagement, then device size and cost increase
Solution Approach 1:
The transmission path is segmented into three rotatable members instead of two. This segmentation allows each gear to be smaller while maintaining reliable engagement, as the rotation is distributed across multiple stages. The third rotatable member enables the use of smaller gear modules while achieving the same overall transmission reliability.
3Reliability
If higher dimensional accuracy is specified for arcuate surfaces, then manufacturing cost increases
Solution Approach 1:
The third rotatable member serves as a mediator that allows relaxed dimensional tolerances on the convex and concave arcuate surfaces. By introducing this intermediate element, the system achieves reliable rotation without requiring high-precision manufacturing of the arcuate surfaces, thereby reducing manufacturing costs.
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
The solution enhances the reliability of rotating the second rotatable member, reduces the need for precise accuracy in gear dimensions, and minimizes costs by allowing smaller gear modules, thus avoiding size and cost increases.
Implementation Method 1
an elastic member configured to rotate the rotatable follower member by an elastic force when the rotatable follower member is not engaged with the rotatable driving member
Data Source
AI summary
A drive transmission device includes a rotatable driving member; a rotatable follower member, and an elastic member. The drive transmission device includes a first rotatable member and a second rotatable member. The first rotatable member includes first and second driving portions and a limiting portion. The second rotatable member includes a first driven portion, a second driven portion and a contact portion contacting the limiting portion. The second driving portion is adjacent to the limiting portion with respect to a rotational axis direction of the first rotatable member. The second driven portion is adjacent to the contact portion with respect to a rotational direction of the second rotatable member.