Pin Tooth Cycloid Reducer Eliminates Planet Carrier
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Solution Overview
Problem
The RV type pin tooth cycloid reducer used in industrial robots has a complex structure with a low yield rate and is prone to damage due to stress concentration, particularly at the eccentric shaft, which is difficult to manufacture and maintain.
Innovation Solution
A new pin tooth cycloid reducer design that eliminates the planet carrier, featuring a first and second cycloid structure system disposed axially, where the cycloid disks in each system rotate at different angles relative to their respective pin tooth housings, allowing for deceleration and torque increase without a planet carrier, simplifying the structure and manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a planet carrier is used to convert cycloid motion to rotation, then power transmission is achieved, but the structure becomes complex and manufacturing precision requirements increase
Solution Approach 1:
The patent removes the planet carrier component from the cycloid reducer system. Instead of using a planet carrier to convert cycloid motion to rotation, the invention directly uses the cycloid disk's cycloid motion to drive the output shaft, eliminating unnecessary components and simplifying the overall structure while maintaining power transmission capability
Solution Approach 2:
The patent divides the cycloid reducer into distinct functional modules: the cycloid disk for motion conversion, the pin teeth for engagement, and the output shaft for power transmission. This modular segmentation allows each component to perform its specific function independently, reducing the need for complex coupling mechanisms like the planet carrier
2Power
If multiple components are used to achieve deceleration, then transmission capability is improved, but manufacturing precision requirements increase and yield rate decreases
Solution Approach 1:
The patent combines the deceleration function and motion conversion function into a single integrated cycloid disk structure. The cycloid disk simultaneously achieves speed reduction and converts cycloid motion to rotational motion, eliminating the need for multiple separate components and thereby reducing cumulative manufacturing precision requirements
Solution Approach 2:
The cycloid disk is designed as a multi-functional component that performs multiple tasks: it engages with pin teeth for deceleration, converts cycloid motion to rotation, and directly drives the output shaft. This multi-functionality reduces the total number of components and their associated precision requirements
3Reliability
If an eccentric shaft is disposed between the planet carrier and cycloid disk, then motion conversion is achieved, but stress concentration occurs and the component is easily damaged
Solution Approach 1:
The patent removes the intermediate eccentric shaft component that caused stress concentration. By directly coupling the cycloid disk to the output shaft and eliminating the planet carrier system, the invention removes the weak link in the transmission chain and reduces stress concentration points
Solution Approach 2:
Instead of using an eccentric shaft to convert motion, the patent inverts the approach by using the cycloid disk's inherent cycloid motion (generated by its offset center) to directly drive the output shaft. This reverses the traditional motion conversion mechanism and eliminates the problematic intermediate component
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 design enhances the robustness and ease of production of the pin tooth cycloid reducer, reducing the risk of damage and improving product quality by eliminating the planet carrier, resulting in increased yield and reliability.
Implementation Method 1
the cycloid disk performs a cycloid motion in the pin tooth housing to achieve deceleration
Data Source
AI summary
A pin tooth cycloid reducer and an industrial robot are provided. The pin tooth cycloid reducer includes: a first cycloid structure system and a second cycloid structure system, disposed in an axial direction, wherein the first cycloid structure system is sleeved on an eccentric shaft, and each cycloid structure system comprises at least one cycloid structure in the axial direction; where the cycloid structure includes: a cycloid disk, a plurality of pin teeth distributed circumferentially and a pin tooth housing, successively disposed from inside to outside in a radial direction; wherein the plurality of pin teeth are rotatably fixed to the pin tooth housing, and the cycloid disk engages with the plurality of pin teeth; wherein all pin tooth housings in the pin tooth cycloid reducer are coaxially disposed. Therefore, deceleration can be achieved.