V-Shaped Guide Groove Design for Power Tool Striking Mechanism
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Solution Overview
Problem
Existing hand-held power tools with mechanical striking mechanisms experience synchronization issues between the hammer and anvil, leading to increased wear due to geometry-related collisions, and require high drive torque.
Innovation Solution
The implementation of V-shaped guide grooves on the drive shaft with a concave-polygonal design, featuring a connecting section with a semicircular curvature and specific angle inclinations, reduces the risk of collisions and lowers drive torque by ensuring improved synchronization between the drive and output cams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cam groove geometry is used, then the striking mechanism can operate, but synchronization between hammer and anvil deteriorates leading to increased wear
Solution Approach 1:
The guide groove is designed with a concave-polygonal cross-section featuring a curved connecting section between the base lines. This curvature modifies the contact path between the driver ball and groove walls, ensuring smoother transitions and maintaining proper synchronization between the hammer and anvil throughout the operating cycle, thereby preventing end-face or edge-side collisions that cause wear.
2Power
If conventional guide groove geometry is used, then the striking mechanism can function, but high drive torque is required
Solution Approach 1:
The guide groove geometry is optimized by changing parameters such as the angle of the base lines (converging at approximately 60 degrees) and the radius of the connecting section. These parameter changes improve the mechanical advantage and reduce friction losses, thereby lowering the drive torque required to operate the striking mechanism while maintaining operational efficiency.
Data Source
AI summary
In a hand-held power tool that includes a mechanical striking mechanism, including a drive shaft for rotatably driving a impactor associated with the mechanical striking mechanism, at least one V-shaped guide groove, whose base lines that converge into a connecting section have a concave-polygonal design, at least in sections, is provided on an outer circumference of the drive shaft.