Multi-mode Drill Transmission Cover Plate Biasing Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multi-speed drills face challenges in efficiently shifting between modes of operation due to complex transmission mechanisms and the need for precise alignment of components, which can lead to misalignment and reduced performance.
Innovation Solution
A multi-mode drill design featuring a transmission sub-assembly with a gear case shell and cover plate, supported by biasing members, allows for smooth shifting between modes through a shift assembly and shift pins, ensuring proper alignment and torque transfer without additional gears, thus simplifying the mechanism and enhancing operational efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a complex transmission mechanism with multiple gears is used to enable multi-speed operation, then the drill can achieve multiple modes of operation, but the complexity of the shifting mechanism increases and alignment precision becomes more difficult to maintain
Solution Approach 1:
The patent combines multiple shifting functions into a single integrated shifting mechanism. The shift assembly includes a shift member that can simultaneously control engagement between different gear pairs (first gear pair and second gear pair) through a unified shifting action, rather than requiring separate shifting mechanisms for each gear pair. This merging reduces the overall complexity of the transmission system while maintaining multi-speed capability.
Solution Approach 2:
The shift member is designed as a multi-functional component that performs multiple shifting operations. A single shift member can engage or disengage different gear pairs (including the first gear pair with first drive gear and first driven gear, and the second gear pair with second drive gear and second driven gear) through its movement, making one component serve multiple functions in the transmission system.
2Productivity
If multiple gear pairs are used to provide different speed ratios, then the drill achieves better performance across different drilling operations, but the risk of misalignment between components increases
Solution Approach 1:
The patent introduces an intermediary structure in the form of a common drive shaft that serves as a mediator between the motor output and the multiple gear pairs. The first drive gear and second drive gear are both mounted on this common drive shaft, which acts as an intermediary element to synchronize their rotation and maintain proper alignment. This intermediary structure ensures that all gear pairs remain properly aligned during operation, reducing the risk of misalignment while maintaining multiple speed ratios for different drilling operations.
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 design enables seamless mode shifting, reduces the risk of misalignment, and maintains efficient torque transfer, resulting in improved performance and user feedback during different drilling operations.
Implementation Method 1
A biasing member is configured to exert a biasing force between the cover plate and the shift member which tends to move the shift member toward the first mode position
Data Source
AI summary
A multi-mode drill can include a transmission to transfer torque from an output member of a motor to an output spindle. A transmission housing encloses the transmission in an interior cavity formed by a gear case shell and a cover plate. The cover plate can be coupled to the outer shell via screws. A static shift rod can be supported at one end by the cover plate. A shift bracket can be mounted on the shift rod and biased to a mode position by a biasing member exerting a force between the shift bracket and the cover plate. A shift pin can be supported adjacent one end by the cover plate and biased to a mode position by a biasing member exerting a force between the shift pin and the cover plate. A spindle biasing member can bias the output spindle against the cover plate. The shift pin can actuate an electronic switch. A motor housing can be coupled to the transmission housing with fasteners so that the cover fasteners are not accessible.