Partial Shaft Cam Interface for Low-Vibration Micro-Hammering
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Solution Overview
Problem
Existing drilling apparatuses with integrated impact mechanisms suffer from high loads on bearings and gear teeth, leading to potential damage and increased maintenance complexity, while also transmitting vibrations to the user.
Innovation Solution
An interface for connecting partial shafts in a functional unit, comprising a first and second cam disk, allows for superimposing a rotary movement with impact movements, reducing mechanical stress and vibrations by separating impact generation from the machine tool's sensitive components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If an integrated impact mechanism is used in drilling apparatuses, then impact movements can be generated to increase working power, but high loads arise on bearings and gear teeth leading to potential damage and increased maintenance complexity
Solution Approach 1:
The shaft device is divided into two separate partial shafts (first partial shaft and second partial shaft) that can be connected via a splined interface. This segmentation allows the impact-generated high loads to be isolated to specific components rather than being distributed throughout the entire shaft device, thereby protecting bearings and gear teeth from excessive stress while maintaining the power transmission capability.
2Power
If an integrated impact mechanism is used in drilling apparatuses, then impact movements can be generated to increase working power, but maintenance complexity increases
Solution Approach 1:
By segmenting the shaft device into separable partial shafts with a standardized splined interface, the design enables easier maintenance. If one partial shaft becomes damaged from impact loads, it can be replaced independently without disassembling the entire shaft device, significantly reducing maintenance complexity and downtime.
Solution Approach 2:
The segmented design allows for selective replacement of worn or damaged partial shafts. Instead of replacing the entire shaft device, only the affected partial shaft needs to be discarded and replaced, while the healthy partial shaft and other components can be recovered and reused.
3Productivity
If an integrated impact mechanism is used in drilling apparatuses, then impact movements can be generated, but vibrations are transmitted to the user
Solution Approach 1:
The splined interface between the two partial shafts acts as an intermediary element that can dampen and absorb vibrations generated by the impact mechanism. This intermediate connection allows power and impact transmission while reducing the direct transmission of harmful vibrations to the user, thereby maintaining drilling efficiency while protecting the user from excessive vibration.
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 solution provides a flexible and efficient drilling system that reduces mechanical impairments, maintenance, and vibration transmission, enabling dry drilling and faster operation with enhanced durability and user safety.
Implementation Method 1
The functional unit comprises a first cam disk and a second cam disk, the first cam disk being present so as to be connected to a shaft device and the second cam disk being present so as to be connected in a locationally fixed manner to a housing. The first cam disk and the second cam disk interact to generate the impact movement S.
Data Source
AI summary
A machine tool having a micro-hammering function. This micro-hammering function can be achieved either by a particular configuration of the machine tool (“integrated” solution) or by providing an external module between the machine tool and its tool (“module solution”). In micro-hammering, impact movements which superimpose a pure rotary movement of the tool of the machine tool and can thus increase, for example, a drilling force of the machine tool, are generated. The external module or the machine tool has cam disks, one of which is fixed to the shaft and the other to the housing. The cam disks can be made or interact in such a way that an impact movement is generated by way of which the rotary movement of the tool of the machine tool can be superimposed. An external module for generating impact movements and to a system of machine tool and external module.