Percussion Mechanism Guide Lug Protrusion for Control Disk Protection
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Solution Overview
Problem
Existing percussion devices for rotary and chisel hammers lack precise guidance and protection for the control disk, leading to potential damage from impact impulses and reduced service life.
Innovation Solution
The guide lug of the firing pin protrudes beyond the control disk in all operating states, ensuring precise guidance and preventing impact impulses from being transmitted to the control disk, with a design where the guide lug extends at least 0.1 mm beyond the control disk and has an axial extension greater than 25% of the firing pin's total length, and an immersion recess allows the guide lug to dip in, limiting its movement and enhancing the striking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide lug is contained within the control disk, then the control disk can move freely, but impact impulses damage the control disk and reduce service life
Solution Approach 1:
The guide lug acts as an intermediary element between the hammer and the control disk. By extending the guide lug beyond the control disk, it intercepts and absorbs impact impulses before they can reach the control disk, thereby protecting it from damage while still allowing the control disk to move freely during normal operation.
Solution Approach 2:
The guide lug protrusion serves as a pre-positioned protective element that cushions impact impulses before they can affect the control disk. This beforehand protection prevents damage accumulation and extends the service life of the control disk without interfering with its operational movement.
2Reliability
If the guide lug protrudes beyond the control disk, then impact impulses are prevented from damaging the control disk, but the guidance precision may be compromised
Solution Approach 1:
The guide lug is segmented into two functional zones: a portion contained within the control disk for precise guidance, and a protruding portion extending beyond the control disk for impact protection. This segmentation allows each zone to fulfill its specific function optimally without compromising the other.
Solution Approach 2:
Different portions of the guide lug have different functions: the inner portion provides precise guidance for control disk movement, while the outer protruding portion provides impact protection. This local differentiation of quality and function resolves the contradiction between guidance precision and protection.
3Reliability
If the guide lug is made longer to protrude beyond the control disk, then protection is improved, but the device complexity increases
Solution Approach 1:
The guide lug serves multiple functions: it provides guidance for the control disk during normal operation and simultaneously acts as a protective element against impact impulses by protruding beyond the control disk. This multi-functionality eliminates the need for separate protective components, thereby reducing overall device complexity.
Solution Approach 2:
The protective function against impact impulses is merged into the existing guide lug structure of the firing pin. By combining guidance and protection functions in a single element, the design avoids adding separate protective components, thus minimizing increases in device complexity.
Data Source
AI summary
The invention proceeds from a percussion mechanism apparatus, in particular for a rotary and/or demolition hammer, having at least one striker (12), having at least one percussion pin (14) which has at least one guide lug (16) facing the striker (12), and having at least one movably mounted control disc (18) which is arranged around the guide lug (16). It is proposed that one end (20) of the guide lug (16) projects beyond the control disc (18) in every operating state.