Dual-Axis Motor Arrangement for Hammer Drill Transmission
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Solution Overview
Problem
Existing hammer drills have complex transmission systems that are costly to manufacture and maintain, and are prone to malfunctions due to their intricate design.
Innovation Solution
The power tool features two separate drive units with distinct axes of rotation, arranged at specific angles within the housing, eliminating the need for a single complex transmission and allowing for a simpler, more robust design with independent transmission ratios for the rotation and impact mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single complex transmission system is used to distribute torque to both rotary drive and impact mechanism, then one drive motor can be used, but the transmission becomes excessively complex with high number of mechanical components
Solution Approach 1:
The single transmission system is segmented into two separate transmission paths: one from the first drive unit to the rotary drive, and another from the second drive unit to the impact mechanism. This segmentation eliminates the need for a complex multi-function transmission, reducing mechanical components while requiring additional drive units.
2Ease of manufacture
If a complex transmission system is used, then torque distribution is achieved, but manufacturing and maintenance costs increase
Solution Approach 1:
By dividing the torque distribution into separate transmission paths with dedicated drive units, each transmission system becomes simpler and more reliable. The segmentation allows for standardized components and reduces the need for precision-matched multi-function mechanisms, lowering manufacturing costs.
3Reliability
If a single drive unit is used, then device simplicity is maintained, but the transmission system becomes prone to malfunctions
Solution Approach 1:
The transmission system is segmented into independent modules, each handling a specific function (rotary drive or impact mechanism). This modular approach isolates potential failure points, allowing one module to fail without compromising the other, thereby improving overall reliability despite increased structural complexity.
4Device complexity
If two drive units with different axes of rotation are used, then complex transmission is eliminated, but installation space requirements change
Solution Approach 1:
The two drive units are arranged with their axes of rotation at specific angles (first angle between drive axes, second angle between first drive axis and working axis). This angular arrangement in three-dimensional space allows the drive units to be compactly integrated into the housing, eliminating the need for extensive transmission mechanisms while optimizing space utilization.
Data Source
AI summary
Power tool, in particular a hammer drill, including a housing, a tool fitting for receiving and holding a tool, an impact device for producing and transmitting impact pulses to the tool, and a rotation device for producing and transmitting a torque to the tool, wherein a working axis passing through the impact device is provided. The power tool includes a first drive unit having a first axis of rotation for driving the rotation device and a second drive unit having a second axis of rotation for driving the impact device, wherein the first and second drive units are arranged in such a way relative to one another in the housing that the first axis of rotation of the first drive unit is arranged at a first angle to the second axis of rotation of the second drive unit and at a second angle to the working axis.