Speed Reducer Elastic Member Backlash Suppression
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Solution Overview
Problem
Existing speed reducers suffer from backlash issues due to manufacturing errors, leading to output torque delays and rattling, requiring complex assembly inspections and component swapping to achieve desired backlash sizes.
Innovation Solution
A speed reducer design incorporating a ring gear, revolving gear, circular cam, penetration pin, and elastic members to absorb manufacturing errors, preventing backlash between the through hole and penetration pin by compressing the elastic member, which rolls between the penetration pin and ring member, reducing friction and eliminating the need for precise component selection and assembly inspections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a through hole and penetration pin are used to extract rotating motion from the revolving gear, then the rotating motion can be extracted, but a backlash occurs due to manufacturing errors
Solution Approach 1:
The patent changes the physical state of the connection between through hole and penetration pin from rigid to flexible by introducing an elastic member. This allows the system to accommodate manufacturing errors while maintaining reliable torque transmission without backlash.
Solution Approach 2:
An elastic member is introduced as an intermediary element between the through hole and penetration pin. This intermediary absorbs dimensional variations and prevents direct contact that would cause backlash, while still transmitting the necessary rotational motion.
2Manufacturing precision
If assembly inspection and component swapping are performed to reduce backlash, then the backlash can be controlled, but the assembly time increases considerably
Solution Approach 1:
The elastic member enables the system to self-adjust to manufacturing variations without requiring external inspection or component swapping. The component assembly is designed to automatically compensate for dimensional errors through the elastic deformation of the member.
3Reliability
If the clearance between through hole and penetration pin is reduced to minimize backlash, then the backlash decreases, but the friction increases and manufacturing difficulty increases
Solution Approach 1:
The patent changes the contact interface from direct rigid contact to elastic contact. This allows for optimal clearance that minimizes both backlash and friction, as the elastic member deforms to maintain contact while accommodating manufacturing tolerances.
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 design effectively suppresses backlash and reduces frictional losses, enabling a large reduction ratio without the need for precise component matching or lengthy assembly processes, making it suitable for applications like robot hands.
Implementation Method 1
the ring member is mounted to the penetration pin through an elastic member
Implementation Method 2
the elastic member, which rolls between the penetration pin and ring member, reducing friction
Data Source
AI summary
Through holes are formed in a revolving gear which revolves while being engaged with a ring gear, and penetration pins on which ring members of a circular ring shape are mounted outside are inserted in the through holes. Further, the ring member is mounted to the penetration pin through an elastic member.