Hammer Drill Anvil Guide External Damper Wear
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Solution Overview
Problem
Existing hammer drills and chipping hammers experience a reduction in the service life of their impact mechanisms due to the integration of the anvil guide within the combined damper element, leading to increased wear and tear.
Innovation Solution
The anvil guide is arranged externally, outside the combined damper element, which prevents the integration of the anvil guide within the damper element and thus reduces wear and tear, enhancing the service life of the impact mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the anvil guide is integrated within the combined damper element, then the structure is more compact and easier to mount, but the service life of the combined damper element is considerably reduced due to increased wear and tear
Solution Approach 1:
The anvil guide is separated from the combined damper element into distinct components. The anvil guide is mounted independently in the housing, while the combined damper element remains separate, eliminating the wear interface between them and extending service life while maintaining compact assembly.
Solution Approach 2:
The anvil guide function is extracted from the combined damper element structure. By providing the anvil guide as a separate component mounted in the housing, the harmful wear interaction is removed while preserving the guiding function needed for anvil movement.
2Reliability
If the anvil guide is arranged outside the combined damper element, then the service life is extended, but the mounting process becomes more complex
Solution Approach 1:
The housing structure serves multiple functions: it provides mechanical support, contains the anvil guide mounting, and houses the combined damper element. This multi-functionality allows the anvil guide to be separate while avoiding additional complex components or assembly steps.
3Object-affected harmful factors
If the combined damper element absorbs idle strikes, then downstream components are protected from force peaks, but the return speed of the anvil is influenced and deactivation behavior is affected
Solution Approach 1:
The combined damper element is designed with differentiated local properties: the rebound-strike portion provides cushioning for normal operation, while the idle-strike portion provides enhanced protection for abnormal conditions. This local quality differentiation allows selective damping without adversely affecting normal anvil return speed and deactivation behavior.
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 significantly extends the service life of the impact mechanism while simplifying the mounting process, as the anvil guide is now separate from the combined damper element.
Implementation Method 1
Idle-strike damper elements and rebound-strike damper elements, which are preferably in the form of elastomer damping elements, are used in order to keep force peaks on downstream components and vibrations as low as possible
Implementation Method 2
The radial bead, which is arranged so as to strike the idle-strike damper element on one side and to strike the rebound-strike damper element on the other side
Implementation Method 3
the longitudinal slot serves for air exchange. As such, it is possible to avoid the anvil being drawn by negative pressure against the idle-strike stop surface
Data Source
AI summary
Hammer drill and/or chipping hammer having a drive motor, an impact mechanism and a tool fitting for fitting a tool, wherein the impact mechanism has an anvil that is axially displaceable in an anvil guide and acts on the tool, wherein the impact mechanism has an idle-strike damper element and a rebound-strike damper element, which are formed in one piece with one another and as such form a combined damper element, wherein the anvil guide is arranged outside, preferably only outside the combined damper element.