Outer Rotor End Cover Retention Against Axial Impact Loosening
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Quadruped robots using outer rotor motors are prone to failure due to the loosening or disengagement of the end cover and steel sleeve under axial impacts, leading to reduced service life and operational instability.
Innovation Solution
The rotor end cover is nested in a magnetic steel sleeve with a retaining portion that presses against its edge to axially fix it, preventing disengagement during impacts, using structures like flanges, steps, or pins for secure fitting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the end cover and steel sleeve are connected by superposition, then the structure is simple and easy to manufacture, but the connection loosens or disengages under axial impact
Solution Approach 1:
The end cover is nested inside the steel sleeve, forming a nested structure where the end cover is received within the cylindrical space of the steel sleeve. This nesting arrangement provides better mechanical interlocking and resistance to axial separation forces compared to simple superposition, while maintaining structural simplicity.
Solution Approach 2:
A retaining ring is pre-installed on the steel sleeve before assembling the end cover. This retaining ring creates a mechanical stop that prevents the end cover from disengaging under axial impact. The preliminary installation of the retaining ring ensures the connection is prepared to withstand impact forces before the end cover is placed.
2Reliability
If the end cover is fixed to the steel sleeve, then the connection is strong, but the structure becomes complex
Solution Approach 1:
The end cover is nested inside the steel sleeve, forming a nested structure where the end cover is received within the cylindrical space of the steel sleeve. This nesting arrangement provides better mechanical interlocking and resistance to axial separation forces compared to simple superposition, while maintaining structural simplicity.
Solution Approach 2:
The retaining ring structure utilizes the existing geometry of the steel sleeve and end cover, requiring no additional complex fastening mechanisms. The retaining ring works with the natural cylindrical shapes to provide self-containing functionality, where the components serve their own retention purpose without requiring external complex fixation systems.
Data Source
AI summary
An outer rotor structure for a motor, rotary power unit, and quadruped robot. The outer rotor structure includes: a magnetic steel sleeve, where an edge of the magnetic steel sleeve extends toward an axis of the magnetic steel sleeve to form a flange; and a rotor end cover provided with a step fitting with the flange on the edge thereof. The rotor end cover is nested in the magnetic steel sleeve. The flange presses against the step to unidirectionally fix the rotor end cover relative to the magnetic steel sleeve in an axis direction. The rotor end cover is nested in the magnetic steel sleeve and the flange of the magnetic steel sleeve presses against the step of the rotor end cover to axially fix the rotor end cover to the magnetic steel sleeve. When a motor unit is subjected to an impact transmitted from a speed reduction unit, the rotor end cover does not disengage from the magnetic steel sleeve.