Electric Actuator Internal Gear Support
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Solution Overview
Problem
Existing electric actuators face efficiency issues due to inclination of internal gears in deceleration mechanisms, leading to decreased transmission efficiency of rotational force from motor shafts to output shafts.
Innovation Solution
The electric actuator design incorporates a deceleration mechanism with a ring-shaped internal gear and an external gear connected via a bearing, where the internal gear is supported by gear supporting parts on the deceleration mechanism case, reducing inclination and enhancing transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the internal gear is supported by multiple gear supporting parts disposed in circumferential direction with intervals, then the inclination of the internal gear is suppressed and transmission efficiency is stabilized, but the device complexity increases due to additional supporting structures
Solution Approach 1:
The gear supporting function is segmented into multiple discrete gear supporting parts (first, second, and third gear supporting parts) disposed at different positions in the circumferential direction. Each supporting part provides localized support to the internal gear, preventing inclination while distributing the support function across multiple elements rather than a single continuous structure.
Solution Approach 2:
The gear supporting parts are positioned at specific locations (first, second, and third positions in the circumferential direction) to provide localized support where needed. This allows the internal gear to be supported at critical points without requiring continuous circumferential support, optimizing the balance between stability and structural simplicity.
2Volume of moving object
If the deceleration mechanism is disposed on one axial-direction side of the stator, then the overall structure is compact, but the internal gear may incline causing decreased transmission efficiency
Solution Approach 1:
The support strategy moves from a single-point support approach to a multi-point support approach in the circumferential dimension. By disposing gear supporting parts at multiple positions (first, second, and third positions) in the circumferential direction, the internal gear is stabilized against inclination while maintaining the compact axial arrangement of the deceleration mechanism.
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 stabilizes the internal gear and increases the transmission efficiency of rotational force from the motor shaft to the output shaft, improving the overall performance of the electric actuator.
Implementation Method 1
The motor shaft includes an eccentric axis part with an eccentric axis, which is eccentric with respect to the central axis, as a center. The external gear is connected to the eccentric axis part via the bearing
Implementation Method 2
The deceleration mechanism includes an internal gear which is in a ring shape with the central axis as a center; an external gear which is connected to the eccentric axis part via the bearing, which is disposed on a radial-direction inner side of the internal gear, and which engages with the internal gear
Data Source
AI summary
An electric actuator includes a motor including a rotor having a motor shaft extending along a central axis and a stator, a deceleration mechanism connected to the motor shaft, an output shaft, a bearing, and a deceleration mechanism case. The motor shaft includes an eccentric axis part with an eccentric axis as a center. The bearing is fitted on of the eccentric axis part. The deceleration mechanism includes an internal gear in a ring shape; an external gear connected to the eccentric axis part via the bearing and engaging with the internal gear; and an output flange part which transmits rotation of the external gear around the central axis to the output shaft. The deceleration mechanism case includes a plurality of gear supporting parts which support an end surface of the internal gear facing one axial-direction side and which are disposed in a circumferential direction with intervals from one another.