Cycloidal Rotor Arc Teeth for Easier Machining and Load Sharing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The manufacturing of cycloidal reducers is hindered by the need for skilled technicians, high-cost equipment, and significant time and manpower due to the complexity of producing cycloidal discs with external teeth, and there is a challenge in evenly distributing the load during rotation to prevent concentration on one side.
Innovation Solution
A cycloidal reducer design featuring a cycloidal rotor with tooth-type protrusions in the shape of circular arcs and a bushing to fill the gap between through-holes and rotor pins, allowing for even load distribution and improved machinability, including a friction reduction mechanism to reduce wear and enhance durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional external teeth are manufactured on the cycloidal disc, then the reducer can achieve proper engagement and torque transmission, but the manufacturing process becomes complex requiring skilled technicians, high-cost equipment, and significant time and manpower
Solution Approach 1:
Instead of adding external teeth to the cycloidal disc, the invention inverts the approach by creating recess portions (tooth-type grooves) on the cycloidal disc that engage with protrusions on the stationary needle rollers. This inversion simplifies manufacturing while maintaining engagement functionality.
Solution Approach 2:
The invention uses standardized needle rollers with predetermined geometries as templates for the engagement features. The recess portions on the cycloidal disc are designed to complement the standard needle roller protrusions, allowing use of off-the-shelf components rather than custom-machined teeth.
2Power
If the cycloidal rotor rotates eccentrically to reduce speed and increase torque, then the reduction ratio can be increased, but the load becomes concentrated on one side during rotation
Solution Approach 1:
The invention segments the load-bearing contact into multiple discrete engagement points around the cycloidal disc perimeter. The recess portions are distributed circumferentially, allowing the load to be shared across multiple needle roller contacts rather than concentrated at a single point during eccentric rotation.
Solution Approach 2:
The recess portions are strategically positioned and shaped to optimize local load distribution. Each recess portion is designed with specific geometry to match the needle roller protrusion, creating optimal contact conditions at each engagement point while maintaining overall load balance.
3Productivity
If simple circular arc recess portions are used instead of complex cycloidal teeth, then machinability is improved and productivity increases, but the engagement precision and load distribution may be compromised
Solution Approach 1:
The invention changes the geometric parameters of the engagement features from complex cycloidal curves to simple circular arcs. This parameter simplification dramatically improves manufacturability while the careful selection of arc radii and positioning ensures adequate engagement precision for the application.
Data Source
AI summary
A cycloidal reducer includes a reduction unit configured to reduce a torque input and an output unit configured to transfer the reduced output to the outside. A cycloidal rotor that is one constituent element of the reduction unit has a tooth-type protrusion formed in the shape of a circular arc. Thus, the level of difficulty of process is decreased more than when the tooth-type protrusion in the related art is formed in the shape of a broken line. In addition, rotor pins are accommodated in through-holes, respectively, that are equally spaced in the cycloidal rotor. A bushing is formed that fills a gap between the through-hole and the rotor pin is formed in order for the rotor pin to stably transfer rotational power. Accordingly, the advantage of effectively distributing a load and stably transferring a reduction torque to the outside is provided.