Hammer Drill Clutch Actuation Perpendicular to Spindle
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Solution Overview
Problem
Existing power tools, such as hammer drills, face challenges in achieving a compact design while maintaining high functional reliability and efficient torque transmission due to the integration of a switching device with a clutch in the hammer mechanism transmission.
Innovation Solution
The integration of a clutch with a coaxially arranged clutch ring and a rotatable driving gearwheel, along with a crank drive wheel, allows for a compact construction by enabling the clutch to be advanced and withdrawn through a linear displacement movement, facilitating torque transmission and disengagement, and utilizing slaving contours for enhanced torque handling and reduced wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switching device with a clutch is integrated in the hammer mechanism transmission, then the ability to switch between rotary and percussive modes is enabled, but the device complexity increases
Solution Approach 1:
The clutch is integrated directly into the hammer mechanism transmission by coupling it with the crank drive wheel, merging the switching function with the existing transmission components. This eliminates the need for a separate switching device and reduces overall system complexity while maintaining the ability to switch between rotary and percussive modes.
Solution Approach 2:
The clutch serves multiple functions: it acts as both a switching device for activating/deactivating the hammer mechanism and as a torque transmission element within the crank drive mechanism. This multi-functionality reduces the number of separate components needed and simplifies the overall transmission system.
2Volume of moving object
If the clutch is integrated in the hammer mechanism transmission with a compact arrangement, then the power tool construction becomes more compact, but the torque transmission capability may be compromised
Solution Approach 1:
The clutch is nested within the existing transmission components, specifically integrated with the crank drive wheel. The clutch plates are arranged within the crank drive mechanism, allowing compact packaging of the clutch assembly within the existing transmission volume without requiring additional space that would increase the overall tool size.
Solution Approach 2:
The clutch actuation stroke is oriented perpendicular to the axis of rotation of the tool spindle, utilizing a different spatial dimension for clutch movement. This perpendicular arrangement allows the clutch to be actuated without interfering with the rotational torque transmission path, enabling compact design while maintaining full torque capability.
3Volume of moving object
If the actuation stroke extends perpendicularly to the axis of rotation of the tool spindle, then the switching device can be located closer to the tool spindle enabling more compact construction, but the actuation mechanism becomes more complex
Solution Approach 1:
Instead of actuating the clutch parallel to the tool spindle axis (conventional approach), the actuation stroke is inverted to extend perpendicular to the spindle axis. This unconventional orientation allows the clutch to be positioned closer to the tool spindle while using the available radial space for actuation, achieving compact construction without excessive actuation mechanism complexity.
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
This design enables a more compact and reliable power tool construction with efficient torque transmission and high functional reliability, allowing for a more economical arrangement of components while maintaining the ability to switch between rotary and percussive modes.
Implementation Method 1
the slaving contours are capable of transmitting large torques and require only a small installation space
Implementation Method 2
when the clutch ring is in the advanced state it transmits a torque from the driving gearwheel to the crank drive wheel
Data Source
AI summary
A hand-operated power tool, particularly a hammer drill (1), includes a drive motor (2), a tool spindle (3) to drive a tool in rotary manner, a rotary drive transmission (4) to couple the drive motor (2) to the tool spindle (3), a hammer mechanism (5) to drive the tool in percussive manner, a hammer mechanism transmission (6) to couple the drive motor (2) to the hammer mechanism (5), and a switching device (7) to activate and deactivate the hammer mechanism (5). The switching device (7) has a clutch (9) that is integrated in a force path (10) of the hammer mechanism transmission (6) and has an actuation stroke (11) for advancing and withdrawing the clutch (6), which stroke extends perpendicularly to the axis of rotation (8) of the tool spindle (3), or parallel to an axis of rotation (37) of an actuating element (28) that is rotated manually to actuate the switching device (7) for advancing and withdrawing the clutch (6).