Robotic Arm Assembly Using Bevel Gear Differential for Compact Power Transmission
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Solution Overview
Problem
Conventional robotic arms have a large axial size and low load weight due to the motor and speed reducer, limiting their compactness and load-carrying capacity.
Innovation Solution
A differential gear train mechanism using bevel gears and transmission mechanisms with servo motors to transmit power efficiently, reducing the size while increasing the load weight capacity by allowing the first and second segments to rotate around predetermined paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a motor and speed reducer are used to drive the robotic arm segments, then the driving function is achieved, but the axial size increases and load weight capacity decreases
Solution Approach 1:
The patent combines multiple driving units and speed reducers into a integrated driving assembly where components are shared and merged. The first and second driving units are positioned adjacent to each other with their speed reducers coupled to common output shafts, eliminating the need for separate mounting structures and reducing overall axial dimensions while maintaining full driving capability for both segments.
Solution Approach 2:
The patent implements a nested arrangement where the second driving unit is positioned within the space defined by the first driving unit's structure. The second motor is mounted on the output shaft of the first speed reducer, and its speed reducer is coupled to the same output shaft, creating a compact nested configuration that minimizes axial size occupation.
2Power
If a motor and speed reducer are used to drive the robotic arm segments, then the driving function is achieved, but the load weight capacity decreases
Solution Approach 1:
The patent combines multiple driving units and speed reducers into a integrated driving assembly where components are shared and merged. The first and second driving units are positioned adjacent to each other with their speed reducers coupled to common output shafts, eliminating the need for separate mounting structures and reducing overall axial dimensions while maintaining full driving capability for both segments.
Solution Approach 2:
The patent implements a multi-functional driving assembly where a single integrated structure performs multiple driving functions. The common output shafts and shared mounting structures serve both the first and second segments, allowing the same structural elements to fulfill multiple functional roles and reduce the total weight that would be required for separate driving systems.
3Adaptability or versatility
If six axes are utilized to achieve maximum movement, then the movement range is maximized, but the structural complexity increases
Solution Approach 1:
The patent divides the robotic arm into distinct segments (first segment and second segment) with dedicated driving units for each. The first driving unit controls rotation of the first segment while the second driving unit controls rotation of the second segment, allowing independent control and simplified structural design for each segment while achieving comprehensive six-axis movement capability through the coordinated operation of all segments.
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 compact structure of the robotic arm assembly achieves a higher load weight capacity and reduced size, enhancing its operational efficiency and versatility.
Implementation Method 1
A differential gear train mechanism using bevel gears and transmission mechanisms with servo motors to transmit power efficiently
Data Source
AI summary
A robotic arm assembly includes a support body, a first segment, a second segment, a first driving device, a second driving device, a first bevel gear, a second bevel gear, a third bevel gear, a first transmission mechanism, and a second transmission mechanism. The first segment is rotatably connected to an end of the support body. The second segment is rotatably connected to the first segment. The first driving device and the second driving device are received in the support body. The first bevel gear and the second bevel gear are rotatably sleeved on opposite ends of the first segment, and mesh with the third bevel gear fixed to the second segment. The first transmission mechanism transmits the power of the first driving member to the first bevel gear, and the second transmission mechanism transmits the power of the second driving member to the second bevel gear.