Hammer Mechanism Coupling Means for Compact Power
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Solution Overview
Problem
Existing handheld machine tools with impact-generation units face challenges in achieving a compact and powerful hammer mechanism design that is both efficient and cost-effective, while also ensuring safe operation and easy mode switching between drilling, screwing, and impact drilling.
Innovation Solution
The design incorporates a clamping chuck drive shaft with a coupling means that is torsionally fixed and axially displaceable, a planetary gearing system, a torque-restriction device, and an impact-generation unit with a spur gear transmission stage, along with a snap die and impact-generation deactivation unit, to enable efficient energy transfer and mode switching with minimal design space and low mass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a traditional hammer mechanism design is used, then the structure is simple to manufacture, but the mechanism is not compact and has high mass
Solution Approach 1:
The coupling means is integrated in one piece with the clamping chuck drive shaft, merging two separate components into a single unified structure. This reduces the overall volume of the hammer mechanism while maintaining the necessary functional complexity for mode switching and torque control.
Solution Approach 2:
The coupling means is positioned to dip into the impact-generation unit, creating a nested arrangement where components are housed within each other's spatial envelope. This nesting approach minimizes the external dimensions of the hammer mechanism without sacrificing internal functionality.
2Weight of moving object
If the coupling means is designed as a separate component, then it can be easily replaced, but the overall mechanism mass increases
Solution Approach 1:
The coupling means is formed as an integral part of the clamping chuck drive shaft, eliminating the need for separate manufacturing and assembly steps. This integration reduces the total mass of the hammer mechanism while the modular design of the coupling interface still allows for functional separation during operation.
3Reliability
If a robust torque-restriction device is added, then safe operation is ensured, but the device complexity increases
Solution Approach 1:
The torque-restriction device is designed to automatically engage and disengage based on the operational mode without requiring external control systems. The device self-regulates torque transmission during screwing operations, ensuring safety while maintaining a relatively simple overall mechanism structure.
Solution Approach 2:
The coupling means serves multiple functions: it transmits torque during drilling operations, provides torque restriction during screwing operations, and enables mode switching between drilling and screwing. This multi-functionality reduces the need for separate dedicated components, thereby limiting the increase in device complexity.
4Volume of moving object
If the impact-generation unit is fully integrated, then the mechanism becomes compact, but the ease of operation for mode switching decreases
Solution Approach 1:
The coupling means is designed with dynamic engagement characteristics, allowing it to dip into and engage with the impact-generation unit smoothly during mode transitions. This dynamic design enables compact integration while maintaining ease of operation through intuitive mode switching triggered by operational conditions.
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 results in a compact, powerful, and cost-effective hammer mechanism that allows for safe and efficient operation across various modes, with enhanced torque control and reduced design complexity, ensuring comfortable and secure use.
Implementation Method 1
a planetary gearing system
Implementation Method 2
a torque-restriction device
Implementation Method 3
an impact-generation unit with a spur gear transmission stage
Implementation Method 4
a coupling means, which is connected to the clamping chuck drive shaft in torsionally fixed manner
Data Source
AI summary
A hammer mechanism is provided, which has at least one impact-generation unit which includes a strike element, a clamping chuck drive shaft mounting the strike element in movable manner in the strike direction in at least one operating state, and a coupling unit which is connected to the clamping chuck drive shaft in torsionally fixed manner and provided to drive the impact-generation unit.