Robot Arm Structure With Proximal Motors For Speed And Efficiency
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Solution Overview
Problem
Conventional robot arm structures face limitations in operational speed and reverse efficiency due to motor placement and gear transmission configurations, where attaching motors to the distal arm member rather than the proximal arm member results in reduced performance.
Innovation Solution
The proposed arm structure features a proximal arm member with two motors, a first bearing with a center axis parallel to the first motor's output shaft, and a second bearing with a perpendicular axis, allowing the distal arm member to swing and a rotary member to rotate efficiently, utilizing spur gears for improved transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If motors are attached to the distal arm member, then the structure is more compact, but operational speed and reverse efficiency are reduced
Solution Approach 1:
The patent inverts the conventional motor placement by attaching motors to the proximal arm member instead of the distal arm member. This reversal allows the motors to be positioned where they can directly drive the proximal arm, eliminating the need for complex distal mounting structures and improving operational speed through more efficient force transmission.
Solution Approach 2:
The patent repositions motors from the distal dimension to the proximal dimension of the arm structure. This dimensional change in motor placement enables better alignment with the proximal arm's rotation axis, improving reverse efficiency and operational speed while maintaining structural compactness through optimized spatial arrangement.
2Volume of moving object
If motors are attached to the distal arm member, then the structure is more compact, but reverse efficiency is reduced
Solution Approach 1:
The patent inverts the conventional motor placement by attaching motors to the proximal arm member instead of the distal arm member. This reversal allows the motors to be positioned where they can directly drive the proximal arm, eliminating the need for complex distal mounting structures and improving operational speed through more efficient force transmission.
Solution Approach 2:
The patent extracts the motors from the distal arm member location and relocates them to the proximal arm member. This extraction eliminates the inefficiencies associated with distal motor mounting, such as increased transmission distance and misalignment, thereby improving reverse efficiency while maintaining structural compactness.
3Loss of energy
If spur gears are used for transmission, then reverse efficiency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the gear type parameter from conventional gears to spur gears, which have tooth profiles that engage more efficiently. This parameter change improves reverse efficiency by reducing sliding friction and improving meshing contact, while the standardized spur gear design helps manage manufacturing precision requirements through well-established manufacturing methods.
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 enhances operational speed and reverse efficiency by positioning motors on the proximal arm member, enabling smoother rotation force transmission and reducing inertia moment, thus improving the overall performance of the robot arm.
Implementation Method 1
a first bearing attached to a distal end of the proximal arm member, the first bearing having a center axis substantially parallel to an axis of an output shaft of the first motor; a distal arm member supported on the distal end of the proximal arm member by the first bearing
Implementation Method 2
a second bearing attached to the distal arm member, the second bearing having a center axis perpendicular to the center axis of the first bearing; a rotary member supported on the distal arm member by the second bearing, the rotary member being rotatable relative to the distal arm member
Implementation Method 3
a first motor transmission gear attached to the proximal arm member, the first motor transmission gear transmitting rotation force of the first motor to the first gear to make the distal arm member swing about the center axis of the first bearing
Implementation Method 4
a second motor transmission gear attached to the proximal arm member or the proximal arm member and the distal arm member, the second motor transmission gear transmitting rotation force of the second motor to the second gear to make the rotary member rotate about the center axis of the second bearing
Data Source
AI summary
The arm structure of a robot includes a first motor and a second motor attached to an arm member, a first bearing attached to the arm member, an arm member supported on the arm member by the first bearing, a first gear rotating together with the first bearing, a first motor transmission gear transmitting rotation force of the first motor to the first gear, a second bearing attached to the arm member and having a center axis perpendicular to a center axis of the first bearing, a rotary member supported on the arm member by the second bearing and rotatable relative to the arm member, a second gear attached to the rotary member, and a second motor transmission gear transmitting rotation force of the second motor to the second gear to make the rotary member rotate.