Compact Hammer Drill Single-Stage Gear Angular Drive
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Solution Overview
Problem
Conventional hammer drills require significant mounting space due to the parallel arrangement of two shafts and a two-stage gear unit, resulting in a large, heavy, and cost-intensive configuration that is not ergonomic for use in tight spaces.
Innovation Solution
A single-stage gear system directly drives the tool shaft and hammer action from the motor shaft, with an angular arrangement of the motor and tool shaft axes and the use of a single-stage angular gear, reducing the need for an intermediate shaft and allowing for a compact, lightweight design with reduced weight and improved ergonomics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a two-stage gear unit with parallel shafts is used to drive the tool shaft and hammer action, then the drilling function is achieved, but the device size and weight increase significantly
Solution Approach 1:
The patent combines the drive shaft and hammer action shaft into a single integrated shaft structure. The motor shaft directly drives both the tool shaft through a single-stage gear and the hammer action through the same shaft, eliminating the need for a separate parallel drive shaft. This merging of functions into one shaft reduces the number of components, decreases weight, and simplifies the overall device structure while maintaining the required drilling functionality.
2Power
If a two-stage gear unit with intermediate shaft is used, then the tool shaft and hammer action are driven, but the mounting space requirement increases
Solution Approach 1:
The patent extracts and eliminates the intermediate shaft from the two-stage gear system. By using a direct single-stage gear connection between the motor shaft and tool shaft, the intermediate transmission shaft is removed entirely. This extraction of the unnecessary component significantly reduces the mounting space required, allowing the hammer drill to be more compact and suitable for tight workspaces.
3Device complexity
If two parallel shafts are arranged for tool shaft and hammer drive, then the drive functions are separated, but the device complexity and cost increase
Solution Approach 1:
The patent implements multi-functionality by designing the motor shaft to serve dual purposes: directly driving the tool shaft through the single-stage gear and simultaneously driving the hammer action. This universal shaft performs multiple functions that previously required separate dedicated shafts, thereby reducing device complexity, lowering the number of components, and decreasing manufacturing costs while maintaining functional separation.
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 more compact, lightweight, and cost-effective hammer drill that can be used in tight spaces with improved ergonomics, as the center of gravity is closer to the handle, enhancing usability and reducing the number of parts and weight, while maintaining precise alignment and reducing assembly complexity.
Implementation Method 1
the pinion of the motor shaft having the spur gearing is in engagement with the crown gear of the tool shaft as well as with the spur gear of the hammer action
Data Source
AI summary
A hammer drill has an electric drive motor having a motor shaft and a tool shaft driven in rotation by the electric drive motor. A hammer action is provided. The tool shaft is driven by a first single-stage gear unit directly by the motor shaft of the electric drive motor. The hammer action is driven by a second single-stage gear unit directly by the motor shaft of the electric drive motor.