Cycloidal Gear Tooth Profile With Backlash for Smooth Shift Actuation
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Solution Overview
Problem
Existing methods for designing cycloidal gears in gear shift actuators often result in reduced machining precision, leading to increased noise and decreased durability due to the need for arbitrary outer tooth gear shapes that deviate from the general rolling circle design, which affects power transmission efficiency.
Innovation Solution
A method that adjusts the rolling circle radii of the inner and outer tooth gears by incorporating a predetermined backlash, allowing for a design that maintains an oil film between the gears and reduces the engagement range, enabling smooth operation and improved machining precision using standard cycloidal gear machining methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the design eccentricity of the outer tooth gear is set to be greater than the theoretical eccentricity to narrow the engagement range, then power transmission efficiency is improved, but machining precision deteriorates and noise increases
Solution Approach 1:
The patent applies parameter changes by modifying the design eccentricity value from the theoretical value to a greater value. Specifically, the design eccentricity is set to 0.08mm while the theoretical eccentricity is 0.069mm, creating a deliberate deviation that narrows the engagement range and improves power transmission efficiency while maintaining manufacturability
Solution Approach 2:
The patent introduces dynamic adjustment capability by providing multiple design eccentricity values (0.08mm, 0.09mm, 0.10mm) that can be selected based on specific application requirements, allowing the system to adapt between engagement range narrowing and machining precision considerations
2Loss of energy
If the outer tooth gear shape is changed to an arbitrary shape to suppress contact between gears, then power transmission efficiency is improved, but machining precision deteriorates
Solution Approach 1:
The patent applies parameter changes by modifying the outer tooth gear parameters (eccentricity, tooth profile dimensions) from their theoretical values to optimized design values. This allows the gear shape to deviate from the standard theoretical form while remaining manufacturable with conventional precision machining methods
Solution Approach 2:
The patent applies partial action by making selective modifications to the outer tooth gear parameters rather than completely changing the gear design. The modifications are applied partially to specific parameters (eccentricity, tooth dimensions) while maintaining the overall cycloidal gear structure and standard machining compatibility
3Ease of operation
If precise machining is applied to achieve zero backlash, then gear engagement smoothness is improved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent applies preliminary action by pre-calculating and pre-setting the design eccentricity and tooth profile parameters during the design phase. This preliminary optimization of parameters ensures that standard machining processes can achieve the desired engagement smoothness without requiring excessive precision or complex manufacturing procedures
Solution Approach 2:
The patent applies parameter changes by adjusting the design parameters (eccentricity, tooth dimensions) to values that inherently provide smooth engagement. By optimizing these parameters beforehand, the system achieves good engagement characteristics with conventional machining precision, avoiding the need for complex high-precision manufacturing
Data Source
AI summary
The present invention relates to a method for designing a cycloidal gear tooth profile of a gear shift actuator, the method designing a profile to have a backlash through a change in the radius of a rolling circle of an internal or external tooth profile of a cycloidal gear, and thus enables the smooth engagement of internal teeth and external teeth, reduces the engagement range of the internal teeth and the external teeth to have excellent durability and enable power loss to be reduced, and enables the shape machining of the gear by using general cycloidal gear machining, thereby facilitating manufacturing and being capable of improving machining precision.