Hammer Mechanism Coupling and Sealing Design
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Solution Overview
Problem
Existing hammer mechanisms for hand tools lack a compact and efficient design that effectively transmits rotary motion to clamping chucks and snap dies, leading to increased space requirements and dust penetration during impact-drilling operations.
Innovation Solution
The integration of a coupling means between the snap die and clamping chuck drive shaft, allowing for the transmission of rotary motion and featuring a sealing region without gear teeth to prevent dust ingress, along with a compact design that includes a planetary gearing system and impact-generation unit for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a coupling means is integrated between the snap die and clamping chuck drive shaft, then rotary motion transmission is improved, but device complexity increases
Solution Approach 1:
The coupling means is integrated directly into the snap die structure, merging the coupling function with the existing snap die component. This eliminates the need for separate coupling mechanisms and reduces overall device complexity while maintaining effective rotary motion transmission from the clamping chuck drive shaft to the clamping chuck.
Solution Approach 2:
The coupling means serves multiple functions: it transmits rotary motion, provides torsionally fixed connection, and enables axial displacement for mode switching. By combining these functions into a single integrated component, the design avoids the need for multiple separate mechanisms, thereby reducing device complexity while improving motion transmission efficiency.
2Object-affected harmful factors
If a sealing region without gear teeth is provided on the snap die, then dust penetration is prevented, but device complexity increases
Solution Approach 1:
A sealing region is provided on the snap die that extends axially along the coupling region. This sealing structure acts as a barrier to prevent dust and contaminants from penetrating into the clamping chuck area. The sealing region is designed without gear teeth to maintain smooth surfaces that facilitate sealing while blocking dust ingress paths.
Solution Approach 2:
The sealing function is extracted as a separate sealing region component that works independently with the coupling region. By separating the sealing function from the gear transmission function, the design allows each component to be optimized for its specific purpose while working together to achieve both dust protection and motion transmission.
3Volume of moving object
If the clamping chuck drive shaft is at least partially situated within a recess of the snap die, then space requirements are reduced, but manufacturing complexity increases
Solution Approach 1:
The clamping chuck drive shaft is positioned within a recess of the snap die, creating a nested arrangement where one component fits into the space of another. This nesting approach reduces the overall volume and space requirements of the hammer mechanism while maintaining proper alignment and function of the drive shaft and coupling components.
Solution Approach 2:
The design utilizes the axial dimension by creating a recess that extends along the axis of the drive shaft. This dimensional approach allows the drive shaft to be positioned within the snap die structure, optimizing space utilization while providing adequate manufacturing access and assembly simplicity through standardized recess geometries.
4Volume of moving object
If a compact design with planetary gearing is used, then space requirements are reduced, but device complexity increases
Solution Approach 1:
The planetary gearing system is integrated into the hammer mechanism to provide compact space-saving transmission. By merging multiple gear functions into a single planetary gear set, the design achieves reduced space requirements while maintaining the necessary motion transmission and speed reduction functions through a unified rather than separate gear components.
Data Source
AI summary
A hammer mechanism has a clamping chuck and a snap die provided for the direct striking of an inserted tool. The snap die includes a coupling element for transmitting a rotary motion to the clamping chuck.