Dual Planetary Gear Power Transmission Thrust Force Cancellation
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Solution Overview
Problem
Existing power transmission systems with two speed changers face challenges in reducing thrust forces, as they either require specific configurations for axial power transmission or struggle with thrust force cancellation, leading to inefficiencies and potential mechanical stress.
Innovation Solution
A power transmission system is designed with two planetary gear type speed reducers where the ring gears of each speed changer are coupled to allow integrated rotation and have the same rotational axis, with specific engagement portions to balance thrust forces through strategically placed bearings, allowing forces to act in directions that cancel each other out, thus reducing overall thrust.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If two speed changers are employed in a power transmission system, then power transmission capability is improved, but thrust forces increase causing mechanical stress
Solution Approach 1:
The patent combines two planetary gear mechanisms (first and second speed changers) into a single integrated transmission system. The ring gear of the first planetary gear mechanism and the ring gear of the second planetary gear mechanism are coupled together, merging the two gear systems to share common structural components and thrust bearing arrangements, thereby reducing overall thrust forces while maintaining dual power source capability
2Stability of the object's composition
If ring gears are coupled in a manner not permitting relative rotation, then structural stability is improved, but thrust force cancellation becomes difficult
Solution Approach 1:
The patent employs asymmetric coupling between the ring gears of the two planetary gear mechanisms. The coupling allows relative rotation in specific directions while restricting it in others, creating an asymmetric constraint system. This asymmetric design enables thrust forces from the two mechanisms to cancel each other out in the axial direction while maintaining structural stability and power transmission integrity
3Force
If thrust bearing is arranged between double pinions, then thrust force support is improved, but device complexity increases
Solution Approach 1:
The patent designs the thrust bearing arrangement to serve multiple functions simultaneously. The same thrust bearing structure supports thrust forces from both the first and second planetary gear mechanisms, provides axial positioning for the coupled ring gears, and enables thrust force cancellation between the two mechanisms. This multi-functional design reduces device complexity compared to providing separate thrust support for each mechanism
Data Source
AI summary
In a power transmission system, a ring gear of a first speed reducer and a ring gear of a second speed reducer are coupled to each other and have the same rotational axis. An engagement portion between the ring gear and a planetary gear is formed such that, when a first motor generates a rotational torque in the forward direction, a force acts on the ring gear in a direction approaching the second speed reducer in the rotational axis direction. An engagement portion between the ring gear and a planetary gear is formed such that, when a second motor generates a rotational torque in the forward direction, a force acts on the ring gear of the second speed reducer in a direction of approaching the first speed reducer in the rotational axis direction.