Multi-mode Drill Mode Collar for Seamless Gear Switching
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Solution Overview
Problem
Multi-mode hammer drills lack an efficient mechanism for seamlessly switching between different operational modes, such as low speed drilling, high speed drilling, and hammer-drilling, which can lead to user confusion and inefficient operation.
Innovation Solution
A multi-mode hammer drill design featuring a rotatable mode collar with distinct positions for each operational mode, coupled with a transmission system that selectively engages gears for low and high speed operations, and a mechanism for engaging hammer members to deliver vibratory impacts, allowing the user to easily switch between modes using a cam surface and shift pins.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a multi-mode hammer drill includes multiple speed modes and hammer mode, then the adaptability for different drilling tasks is improved, but the device complexity increases due to multiple transmission gears and mode switching mechanisms
Solution Approach 1:
The mode collar serves as a universal control mechanism that integrates multiple functions: it selects between low speed mode, high speed mode, and hammer-drilling mode through a single rotary interface. This multi-functional component consolidates what would otherwise require separate controls for each mode, thereby improving adaptability while managing device complexity.
Solution Approach 2:
The transmission system employs a nested gear arrangement where a first output gear and a second output gear are positioned coaxially, with the mode collar engaging these gears through nested radial positions. This nesting allows multiple speed modes to be integrated within a compact transmission structure, reducing overall device complexity while maintaining multi-mode adaptability.
2Reliability
If the hammer mode is restricted to high speed mode only, then the operational reliability is improved by preventing incorrect mode selection, but the ease of operation is reduced due to limited mode availability
Solution Approach 1:
The mode collar incorporates visual indicators (such as windows displaying mode identifiers) that provide feedback to the user about the currently selected mode. This feedback mechanism ensures users can verify their mode selection, improving reliability by preventing incorrect mode engagement while maintaining ease of operation through clear, intuitive mode identification.
Solution Approach 2:
The transmission system dynamically configures available modes based on the selected output gear position. When in high speed mode, the hammer mode becomes available; when in low speed mode, hammer mode is unavailable. This dynamic availability is communicated to the user through the mode collar interface, ensuring reliable operation while adapting to user needs.
3Ease of operation
If the mode collar provides distinct positions for each mode, then the ease of operation is improved through intuitive mode switching, but the device complexity increases due to additional cam surfaces and shift pins
Solution Approach 1:
The mode collar combines multiple control functions into a single rotary component. Instead of having separate controls for speed selection and hammer mode activation, the mode collar integrates both functions into one unified interface with distinct radial positions. This merging improves ease of operation by simplifying the user interface while the internal cam and pin mechanisms efficiently manage the complexity of mode transitions.
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 smooth and intuitive switching between modes, enhancing user experience and operational efficiency by ensuring the hammer mode is only selectable in high speed, thus optimizing performance for various drilling tasks.
Implementation Method 1
a resilient means disposed in the housing and engaged with the output spindle for returning the output spindle to an initial position
Implementation Method 2
A cam surface is provided on the mode collar and a shift pin is provided in the housing. The shift pin is movable along the cam surface. Movement of the mode collar into different positions causes the shift pin to move along the cam surface
Data Source
AI summary
A drill includes a housing and a motor coupled to an output member by a transmission. The transmission can selectively couple the output member to an output spindle through a low speed output gear or a high speed output gear for rotating the output spindle at a first speed or a second speed, respectively. Alternatively or additionally, a low speed mode can be provided by actuating an electronic switch that limits the speed of the motor. A rotatably fixed hammer member and a rotatable hammer member can be mounted around the output spindle. A mode collar can be rotatably mounted on the housing and around the output member for movement to positions that correspond to various mode of operation, including a low speed mode, a high speed mode, and a hammer-drilling mode. In the hammer-drilling mode, the transmission operates in the high speed mode.