Electric Actuator Eccentric Shaft Cup Member Alignment
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Solution Overview
Problem
Existing electric actuators face a decrease in transmission efficiency due to misalignment between the ring gear of the decelerator and the output shaft, leading to inefficient rotation transmission from the motor shaft to the output shaft.
Innovation Solution
The electric actuator design includes a motor shaft with an eccentric axis, a deceleration mechanism featuring an internal gear and external gear connected via bearings, and a deceleration mechanism case that stabilizes the internal gear and output shaft coaxially, ensuring efficient rotation transmission by reducing misalignment and enhancing material usage efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the ring gear and output shaft are not disposed coaxially, then the device complexity is reduced, but the transmission efficiency decreases
Solution Approach 1:
A cup member is introduced as an intermediary component to connect the deceleration mechanism case and the output shaft. This cup member provides a precise mounting position for the ring gear, ensuring coaxial alignment with the output shaft while simplifying the overall structural design. The cup member acts as a mediator that resolves the alignment issue without adding complex adjustment mechanisms.
Solution Approach 2:
The cup member is pre-formed with precise cylindrical surfaces that guide the ring gear into correct coaxial alignment during assembly. This preliminary positioning action ensures that the ring gear and output shaft are aligned before operation, eliminating the need for complex post-assembly adjustments and maintaining high transmission efficiency.
2Manufacturing precision
If a single-member cup member is used, then the manufacturing precision is improved, but the device complexity increases
Solution Approach 1:
The cup member integrates multiple functions into a single component: it serves as a structural support, a precision alignment reference, and a mounting base for the ring gear. By merging these functions into one metal component, the invention achieves high coaxial alignment precision without proportionally increasing device complexity, as the cup member replaces what would otherwise require multiple separate alignment and support elements.
3Loss of energy
If the deceleration mechanism is stabilized coaxially, then the transmission efficiency is improved, but the ease of manufacture decreases
Solution Approach 1:
The cup member is manufactured with pre-formed cylindrical surfaces and mounting features that automatically guide the ring gear and output shaft into correct coaxial alignment during assembly. This preliminary action of pre-forming precise geometric features simplifies the assembly process while ensuring high transmission efficiency, as components self-align rather than requiring complex adjustment procedures.
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 and increases the transmission efficiency of rotation from the motor shaft to the output shaft, reducing material usage and maintaining positional accuracy, thereby improving the overall performance of the electric actuator.
Implementation Method 1
The external gear is connected to the eccentric axis part via the first bearing, which is disposed on a radial-direction inner side of the internal gear
Implementation Method 2
a second bearing which is fitted on a radial-direction outer side of the output shaft
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 first bearing, a second bearing, and a deceleration mechanism case. The first bearing is fitted on an eccentric axis part of the motor shaft. The deceleration mechanism includes an internal gear in a ring shape, an external gear connected to the eccentric axis part, 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 case body and a cup member. The cup member includes a first cylinder part to which the internal gear is fitted on the radial-direction inner side, and a second cylinder part to which the second bearing is fitted on the radial-direction inner side.