Circumferential Sealing Structure for Vibrating Hammer Assemblies
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Solution Overview
Problem
Existing machine tools, such as drill and chisel hammers, face challenges in providing a seal that compensates for vibrations and prevents dust ingress while optimizing installation space, particularly when the assembly moves in multiple directions relative to the housing.
Innovation Solution
A sealing device is arranged circumferentially around the vertical direction of the machine tool, allowing for large movements in vertical and transverse directions while maintaining a seal between the assembly and the housing, and is connected to both via a flexible and dimensionally stable element, ensuring effective air circulation and cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a uniaxial air barrier is used to prevent dust ingress, then dust prevention is improved, but installation space is wasted and vibrations in other directions are not compensated
Solution Approach 1:
The sealing device transitions from a uniaxial air barrier (single direction) to a circumferential sealing structure (three-dimensional arrangement around the vertical direction). This dimensional change allows the seal to compensate for vibrations in multiple directions (longitudinal, vertical, and transverse) simultaneously, while optimizing the use of installation space by surrounding the assembly rather than occupying a large linear space.
2Object-affected harmful factors
If a uniaxial air barrier is arranged in the lower region, then dust prevention is achieved, but installation space efficiency deteriorates
Solution Approach 1:
The sealing device is arranged circumferentially around the vertical direction, utilizing the vertical dimension and surrounding space rather than occupying horizontal space in the lower region. This allows electrical connections, cable harnesses, and dust extraction systems to be arranged in the lower region without interference, improving installation space efficiency while maintaining dust prevention functionality.
3Adaptability or versatility
If the sealing device is arranged circumferentially around the vertical direction, then multi-directional vibration compensation is improved, but device complexity increases
Solution Approach 1:
The sealing device incorporates a flexible element that can deform to accommodate vibrations and movements in multiple directions (longitudinal, vertical, and transverse). This flexible membrane or shell structure provides multi-directional adaptability without requiring a complex rigid mechanism, as the flexibility of the material itself enables movement compensation in all directions while maintaining a relatively simple overall structure.
Solution Approach 2:
The circumferential sealing device performs multiple functions simultaneously: it seals against dust ingress, compensates for vibrations in all directions, and allows freedom of movement for the assembly. This multi-functionality reduces the need for separate components for each function, thereby managing device complexity while achieving versatile performance.
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 sealing device effectively prevents air flow and dust ingress, maintains efficient cooling, and allows for easy arrangement of electrical components, while accommodating significant assembly movements without compromising installation space.
Implementation Method 1
a sealing device (87) is provided to restrict and in particular to substantially completely prevent an air flow between the assembly (9) and the housing (5)
Implementation Method 2
the sealing device has a flexible element and a dimensionally stable element
Data Source
AI summary
A machine tool (1), in particular a drill hammer or chisel hammer, is described having a housing (5) having a grip region (7, 27) and an assembly (9) including an impact mechanism (11) and a drive device (13), the assembly (9) being arranged substantially within the housing (5) and being arranged movably relative to the housing (5). A center of gravity (15) of the assembly (9) is arranged at a distance from an impact axis (19). A sealing device (87) is provided to restrict an air flow between the assembly (9) and the housing (5), wherein the sealing device (87) is connected to the assembly (9) and to the housing (5) and encompasses the assembly (9) circumferentially relative to a vertical direction (Y) of the machine tool (1).