Mechanical joint, mechanical arm, and self-moving cleaning device
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Solution Overview
Problem
Existing mechanical arms in self-moving cleaning devices lack a compact and efficient mechanism to allow for the rotation and folding of arms, limiting their operational range and increasing their size and complexity.
Innovation Solution
A mechanical joint with a planetary speed-reducing mechanism and an outer rotor motor is used to connect arms, integrating the motor base plate with the gearbox input end cover, simplifying the structure and reducing dimensions while enhancing stability and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a mechanical joint with separate motor base plate and gearbox input end cover is used, then the structural strength is improved, but the device complexity and dimensions increase
Solution Approach 1:
The motor base plate and gearbox input end cover are merged into a single integrated component. The motor base plate is designed with a through-hole structure that directly receives the planetary gear set, eliminating the need for a separate input end cover. This integration reduces the number of parts, simplifies assembly, and decreases overall dimensions while maintaining structural strength through optimized thickness and material distribution.
Solution Approach 2:
The motor base plate performs multiple functions simultaneously: it serves as the motor mounting base, the gearbox input end cover, and the structural support for the planetary gear set. The through-hole design allows the first output shaft to pass through while providing mounting surfaces for the planetary gear set, making the single component universal and eliminating the need for separate specialized parts.
2Ease of manufacture
If traditional mechanical joints with separate components are used, then ease of manufacture is improved, but the operational range and compactness deteriorate
Solution Approach 1:
The motor base plate and input end cover are combined into one integrated part, reducing the total volume of the mechanical joint. This integration eliminates gaps and interfaces between separate components, achieving a more compact design that reduces the overall dimensions of the mechanical arm while maintaining manufacturability through standard machining processes.
3Device complexity
If the motor base plate and gearbox input end cover are integrated, then the device complexity is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The integration of the motor base plate and input end cover into a single component reduces device complexity by eliminating the interface between two parts. While this concentrates precision requirements into one component, it eliminates cumulative tolerances from multiple assemblies. The through-hole design and mounting surfaces are engineered with appropriate tolerance zones to balance manufacturing feasibility with functional precision.
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
The mechanical joint enables efficient rotation and folding of arms, expanding the operational range of the mechanical arm and reducing noise and wear, while maintaining a compact design suitable for self-moving cleaning devices.
Implementation Method 1
a planetary speed-reducing mechanism, which includes a primary gear set and an output end, wherein the primary gear set is connected to the first output shaft and arranged adjacent to the motor base plate
Implementation Method 2
a motor, which includes a first output shaft, a motor base plate, a stator and a rotor, wherein the rotor is located outside the stator
Data Source
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AI summary
A mechanical joint (30) configured to connect first and second arms (60, 70, 80) in a mechanical arm (001). The mechanical joint (30) comprises: a motor (310), wherein the motor (310) comprises a first output shaft (311), a motor substrate (312), a stator (313) and a rotor (314), the rotor (314) is located outside the stator (313), the first output shaft (311) passes through the motor substrate (312), and the stator (313) is connected to the motor substrate (312) and located on the peripheral side of the first output shaft (311); and a planetary speed reduction mechanism (320) comprising a primary gear set (321) and an output end, wherein the primary gear set (321) is connected to the first output shaft (311) and arranged adjacent to the motor substrate (312), and the output end is configured to drive the second arms to rotate relative to the first arm. Also provided are a mechanical arm (001) comprising the mechanical joint (30), and a self-moving cleaning device (002) comprising the mechanical arm (001).