Impact Wrench Asymmetric Battery Mounting
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Solution Overview
Problem
Impact wrenches and power tools often experience reduced work efficiency due to the use of multiple battery packs, leading to suboptimal performance.
Innovation Solution
The design incorporates a brushless motor with a rotor and stator configuration, a controller for motor control, and a dual battery mount system allowing for the attachment of two battery packs in a specific positional arrangement to optimize power distribution and balance, reducing the likelihood of efficiency loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple battery packs are attached to increase output power, then power output is improved, but work efficiency deteriorates
Solution Approach 1:
The battery packs are positioned asymmetrically relative to the brushless motor, with specific attention to the lateral direction alignment. This asymmetric positioning optimizes the center of gravity and reduces rotational inertia, allowing the tool to maintain high work efficiency while delivering increased output power from multiple battery packs.
Solution Approach 2:
The patent introduces a new consideration dimension for battery pack positioning by emphasizing alignment in the lateral direction (width direction) rather than only front-rear positioning. This dimensional shift in positioning strategy enables optimized power distribution and balance, resolving the efficiency loss typically caused by multiple battery packs.
2Power
If multiple battery packs are attached to increase output power, then power output is improved, but operational stability deteriorates
Solution Approach 1:
The asymmetric positioning of battery packs relative to the motor, with specific lateral direction alignment, optimizes the center of gravity position. This reduces rotational inertia and improves operational stability during high-power operation, preventing the instability that would normally result from multiple battery pack attachment.
3Power
If battery packs are positioned to maximize power output, then power output is improved, but torque deteriorates
Solution Approach 1:
By introducing lateral direction alignment as a critical positioning dimension, the patent achieves optimized power distribution that simultaneously maintains high torque output. This dimensional approach ensures proper alignment between battery packs and motor, enabling both high power output and high torque performance.
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 the impact wrench's ability to maintain high work efficiency even with multiple battery packs, improving torque and operational stability by aligning the motor and battery packs for balanced power delivery.
Implementation Method 1
a brushless motor located above the hammer, the brushless motor including a rotor configured to rotate the hammer, and a stator facing the rotor
Implementation Method 2
a hammer at least partially located above the anvil, the hammer being configured to strike the anvil in a rotation direction
Implementation Method 3
a battery pack to be attached to a battery mount of the power tool
Data Source
AI summary
An impact wrench includes an anvil to which a socket is attachable, a hammer located above the anvil to strike the anvil in a rotation direction, a brushless motor located above the hammer and including a rotor and a stator, a controller that controls rotation of the brushless motor, a case accommodating the hammer, a rod located above the case, a head located above the rod, accommodating the controller, and including a battery mount to which a battery pack is attachable, a forward-reverse switch, and a panel elongated in a lateral direction, and a grip extending from the head in the lateral direction and including a trigger switch.