Offset Gear Die Grinder for Compact Speed and Torque Adjustment
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Solution Overview
Problem
Existing die grinders lack an efficient mechanism to adjust speed and torque without increasing the overall size or part count of the tool, limiting their versatility and efficiency.
Innovation Solution
The implementation of an offset gear assembly within the die grinder's gearbox, where the input and output gears are offset by a specific distance, allowing for adjustable speed and torque without altering the tool's dimensions, using a compact design with reduced parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional gear transmission is used in die grinders, then the structure is simple, but the speed and torque adjustment capability is limited
Solution Approach 1:
The patent implements a nested gear configuration where the input gear is positioned inside the output gear, with the input gear's outer periphery meshing with the output gear's inner periphery. This nested arrangement allows both gears to be compactly integrated within the same spatial envelope, enabling speed and torque adjustment without increasing the overall gearbox size or adding excessive complexity.
Solution Approach 2:
The patent introduces an offset dimension between the input and output drive axes, where the output drive axis is offset from the input drive axis within the drive plane. This dimensional offset creates the necessary spatial relationship for the nested gear meshing while maintaining a compact form factor, allowing versatility enhancement without proportional increases in device complexity.
2Adaptability or versatility
If speed and torque adjustment mechanisms are added to die grinders, then versatility improves, but the overall size of the tool increases
Solution Approach 1:
By nesting the input gear inside the output gear with their peripheries meshing, the patent achieves speed and torque adjustment functionality within a compact volume. The nested configuration allows both gears to share the same radial space, preventing the tool dimensions from increasing proportionally with the added adjustment capability.
Solution Approach 2:
The patent combines the input and output gears into a single integrated gear assembly where both gears operate within the same spatial envelope. This merging of gear functions into a unified offset gear assembly reduces the overall volume required compared to separate adjustment mechanisms.
3Adaptability or versatility
If multiple gears and components are added for speed control, then functionality improves, but the part count increases
Solution Approach 1:
The patent merges the input gear and output gear into a single offset gear assembly where the two gears directly mesh with each other. This consolidation reduces the part count compared to traditional multi-stage gear trains or separate adjustment mechanisms, as the speed and torque control is achieved through the direct offset gear relationship rather than multiple intermediate components.
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 offset gear assembly enables precise control over speed and torque adjustments, providing versatility and cost savings while maintaining a compact form factor, thus enhancing the tool's performance and manufacturing efficiency.
Implementation Method 1
the outer periphery of the input gear is meshed with the inner periphery of the output gear
Data Source
AI summary
A tool includes a housing, a motor within the housing, a gear box operably coupled to the motor, the gear box including an input shaft that rotates about an input drive axis and an output shaft that rotates about an output drive axis, wherein the output drive axis is aligned with the input drive axis along a drive plane and offset from the input drive axis within the drive plane.