Vibration Switching Mechanism for Compact Electric Power Tools
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Solution Overview
Problem
Existing electric power tools face challenges in achieving compactness, reducing lubricant leakage, and enhancing gear case strength, particularly in vibration driver drills where the vibration switching mechanisms are not adequately compact and efficient.
Innovation Solution
The electric power tool design incorporates a motor, spindle, first and second vibration cams, and a vibration switching member with biasing members to switch between rotatable and unrotatable conditions, along with a planetary gear mechanism and internal gear lock pins biased by elastic bodies to achieve compactness and reduce lubricant leakage, while improving gear case strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a vibration switching mechanism is added to enable vibration mode, then the functionality and versatility of the power tool is improved, but the device complexity and radial size increase
Solution Approach 1:
The vibration switching member is integrated with the mode switching ring, combining multiple switching functions into a single component. The mode switching ring simultaneously controls both the vibration mode switching and the drill/clutch mode switching, reducing the number of separate components and simplifying the overall mechanism.
Solution Approach 2:
The mode switching ring serves multiple functions: it switches between vibration mode and non-vibration mode, and also switches between drill mode and clutch mode. This multi-functionality reduces the need for separate switching mechanisms and reduces overall device complexity.
2Ease of operation
If the vibration switching member is positioned radially outward for ease of operation, then the ease of operation is improved, but the radial size of the tool increases
Solution Approach 1:
The vibration switching member is positioned in the axial direction rather than being extended radially outward. The member protrudes axially from the mode switching ring, allowing operation from the end of the tool rather than from the side, thus maintaining compact radial dimensions while preserving ease of operation.
3Adaptability or versatility
If conventional vibration switching mechanisms are used, then the vibration switching function is achieved, but lubricant leakage from the gear case increases
Solution Approach 1:
The vibration switching member is nested within the mode switching ring structure, with the member being received by grooves formed in the mode switching ring. This nested arrangement allows the vibration switching mechanism to be integrated within the existing gear case structure without creating additional leakage paths.
Solution Approach 2:
The vibration switching mechanism is merged with the mode switching ring, eliminating the need for separate housing structures that would create additional sealing requirements. The integrated design reduces the number of interfaces where lubricant leakage could occur.
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 results in a compact electric power tool with reduced lubricant leakage and enhanced gear case strength, enabling reliable operation in various modes such as vibration, drill, and clutch modes.
Implementation Method 1
a plurality of biasing members (182) biasing the vibration switching member (172)
Implementation Method 2
The second vibration cam (154) is configured to be in friction with the first vibration cam (152)
Data Source
AI summary
An electric power tool includes a motor, a spindle, a first vibration cam, a housing, a second vibration cam, a vibration switching member, and a plurality of biasing members. The spindle is rotatable by the motor. The first vibration cam is fixed to the spindle. The first vibration cam is located inward of the housing. The second vibration cam is located inward of the housing. The second vibration cam is configured to be in friction with the first vibration cam. The vibration switching member switches between a rotatable condition and an unrotatable condition of the second vibration cam with respect to the housing. The plurality of biasing members bias the vibration switching member.