Multi-Motor Concrete Saw Layout for Blade-Aligned Balance
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Solution Overview
Problem
Concrete saws face challenges in maintaining stability and balance due to the heavy and unwieldy nature of powerful motors required for cutting hard materials, which also impacts their form factor and ambidextrous operation.
Innovation Solution
A concrete saw with a multi-motor drive unit where multiple motors are engaged with a single gear transmission, featuring a pulley assembly and gear arrangement that reduces inertial forces and allows for a more compact profile, enabling a forward placement of the power source and alignment of the center of gravity with the blade, enhancing stability and balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a powerful motor is used to generate sufficient torque for cutting hard materials, then the cutting capability is improved, but the weight and difficulty of maintaining stable operation increase
Solution Approach 1:
The single motor is divided into multiple smaller motors (typically three) that work together to provide the required torque. Each motor contributes a portion of the total power, allowing the system to achieve the necessary torque output while using lighter individual motor units, thereby reducing overall weight and improving balance.
Solution Approach 2:
Multiple motor units are combined into a multi-motor drive assembly where their outputs are integrated through a common transmission system. The motors are arranged in a triangular configuration around the transmission, with their combined torque transmitted through gears to the blade, achieving the required power output while distributing weight more favorably.
2Power
If a powerful motor is used to generate sufficient torque for cutting hard materials, then the cutting capability is improved, but the device becomes unwieldy and difficult to operate
Solution Approach 1:
The multi-motor assembly uses an asymmetric triangular arrangement of motors around the transmission, with motors positioned at specific angles (e.g., 120 degrees apart) to optimize balance. This asymmetric configuration, combined with the triangular support legs, creates a stable geometric structure that reduces vibration and improves control during operation.
Solution Approach 2:
The triangular support structure with legs extending from each motor assembly acts as a counterbalancing mechanism. The support legs provide structural stability and help distribute the weight and vibrations generated during cutting, making the saw easier to control and operate despite the powerful motor assembly.
3Volume of moving object
If a compact design is implemented to improve portability, then the form factor is reduced, but the stability and balance during operation deteriorate
Solution Approach 1:
The motor assemblies are arranged in a three-dimensional triangular configuration around the central transmission, utilizing vertical and radial space efficiently. The support legs extend downward to provide a stable base, transforming a potentially top-heavy design into a grounded, balanced structure that maintains stability while keeping the overall footprint compact.
Solution Approach 2:
The support legs and motor mounting structure are designed in advance to establish a stable triangular configuration before operation begins. This pre-configured geometric structure ensures balance and stability are built into the design from the start, allowing the compact saw to maintain operational stability without requiring additional balancing mechanisms during use.
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 solution improves the stability and balance of the concrete saw during operation, reduces user fatigue, and allows for ambidextrous use by aligning the center of gravity with the blade, thereby directing weight into the cut and minimizing user-borne weight, while maintaining effective power output.
Implementation Method 1
a transmission coupled between the multi-motor drive unit and the pulley assembly and configured to transmit a driving force generated by the multi-motor drive unit to the pulley assembly to rotate the blade
Implementation Method 2
a pulley assembly coupled to the blade
Data Source
AI summary
A power-driven tool is provided. The tool is driven by a driving system including a multi-motor drive unit including multiple motors providing torque to a master gear of a transmission. Some of the motors are directly engaged with the master gear, and some of the motors are engaged with the master gear via an idler gear. The master gear drives a pulley assembly that, in turn, drives a blade of the power driven tool.