Integrated Anvil Damper for Hammer Drill Impact Mechanism
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Solution Overview
Problem
Existing hammer drills and chipping hammers face issues with idle strikes when the pressing force is too low, leading to full impact energy absorption by the hammer and tool fitting, which can cause force peaks and vibration, necessitating the use of separate idle-strike damping elements to protect downstream components.
Innovation Solution
Integrating the idle-strike and rebound-strike damper elements onto the anvil as a combined elastomer damper element, which can be vulcanized or connected via a form-fitting connection, and surrounding it with a stop sleeve to absorb idle and rebound strikes, while allowing the tool fitting to be mounted in a floating manner with additional damper elements between the tool and guide housing to attenuate impact energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If separate idle-strike and rebound-strike damper elements are used, then force peaks and vibrations are reduced, but device complexity and component count increase
Solution Approach 1:
The patent combines the idle-strike damper element and rebound-strike damper element into a single integrated damper element that is formed in one piece. This combined damper element is mounted on the anvil and provides both idle-strike damping and rebound-strike damping functions, thereby reducing the number of components while maintaining the ability to reduce force peaks and vibrations.
2Loss of energy
If multiple separate damper elements are used, then impact energy is attenuated, but manufacturing complexity and cost increase
Solution Approach 1:
The patent integrates multiple damper functions into a single damper element that can be manufactured as one piece. This unified component approach simplifies the manufacturing process compared to producing and assembling multiple separate damper elements, while still achieving effective impact energy attenuation through the combined damping actions.
3Reliability
If separate damper elements are assembled, then damping function is achieved, but assembly steps and time increase
Solution Approach 1:
The patent merges the idle-strike and rebound-strike damper elements into a single integrated component that is mounted on the anvil in one operation. This eliminates the need for multiple separate assembly steps to install different damper elements, thereby reducing assembly time while maintaining the complete damping function.
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 configuration simplifies the structure, reduces component count, and lowers costs by allowing a single working step assembly, effectively reducing force peaks and vibrations, thereby protecting components and enhancing the hammer's deactivation behavior.
Implementation Method 1
the combined damper element is in the form of an elastomer
Implementation Method 2
Idle-strike damping by the idle-strike damper element influences the return speed of the anvil after an idle strike
Implementation Method 3
the combined damper element has been vulcanized on the anvil
Data Source
AI summary
Hammer drill and/or chipping hammer (100) having a drive motor (70), an impact mechanism (10) and a tool fitting (50) for fitting a tool (110), wherein the impact mechanism (10) has an anvil (30) that is axially displaceable in an anvil guide (20) and acts on the tool (110), wherein the impact mechanism (10) is equipped with an idle-strike damper element (11) and a rebound-strike damper element (13), wherein the idle-strike damper element (11) and/or the rebound-strike damper element (13) is/are integrated on the anvil (30).