Planetary Gear Actuator With Elastic Coupling for Noise Suppression
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Solution Overview
Problem
Existing actuators with two-stage planetary gear mechanisms suffer from significant rotation shake and periodic noise during motor rotation, making it difficult to suppress noise effectively.
Innovation Solution
The actuator incorporates a sun gear, internal gear, planetary gears, and a planetary carrier with protruded support shafts, a power transmission member with convex portions, and an elastic member between the support shafts and convex portions to absorb rotation forces, reducing noise through elastic deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a two-stage planetary gear mechanism is used in the deceleration gear portion, then the actuator achieves compact size, but rotation shake and periodic noise increase significantly
Solution Approach 1:
A vibration damping member is introduced as an intermediary component between the planetary carrier and the drive shaft. This mediator absorbs and dampens the rotation shake generated by the two-stage planetary gear mechanism, preventing the shake from being transmitted to the drive shaft. The vibration damping member specifically targets the harmful vibrations while allowing the compact planetary gear structure to remain intact, thus resolving the contradiction between compact size and noise reduction.
2Power
If a two-stage planetary gear mechanism with multiple components is used, then deceleration ratio is achieved, but device complexity increases
Solution Approach 1:
The patent employs a nested structure where the first planetary gear mechanism and the second planetary gear mechanism are arranged concentrically, with one mechanism nested within or alongside the other. This nesting approach allows both gear mechanisms to share common components such as the sun gear, planetary gears, and carrier structures, thereby achieving the required deceleration ratio while minimizing the total number of discrete components and reducing overall structural complexity.
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 configuration effectively suppresses periodic noise from rotation shake, enhancing the silent operation of the actuator while maintaining compactness and reducing component costs.
Implementation Method 1
an elastic member arranged between the support shafts and the convex portions in a rotation direction of the drive shaft
Data Source
AI summary
An actuator is provided, in which second support shafts are protruded to an output shaft side in an axial direction of a second planetary carrier. A power transmission member having convex portions which are protruded radially outward and receive rotation forces from the second support shafts are arranged on a second planetary carrier side of the output shaft in the axial direction. An elastic member is arranged between the second support shafts and the convex portions in a rotation direction of the output shaft. Therefore, the rotation force of the second planetary carrier due to rotation drive of an electric motor is transmitted from the second support shafts to the convex portions of the power transmission member via the elastic member.