Lower Buffer Bushing Protector Deflects Particles
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Solution Overview
Problem
Current systems for protecting impact hammer components from wear and damage caused by particles during operation are inadequate, as they either require multiple expensive parts, provide minimal protection against larger particles, or are easily damaged due to heavy-duty use.
Innovation Solution
A protection assembly comprising a housing, a first outer shield member, and an inner shield member that forms a channel to deflect particles, with the inner shield member being slideably disposed and easily replaceable to minimize wear and extend the life of the impact hammer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple protective parts are used, then protection against small particles is improved, but device complexity and cost increase
Solution Approach 1:
The protective device is divided into two functional segments: an outer shield member for large particles and an inner shield member for small particles. This segmentation allows each component to be optimized for its specific protective function while maintaining overall system simplicity.
Solution Approach 2:
The inner shield member is nested within the channel defined by the outer shield member and housing. This nested configuration allows multiple protective functions to be combined in a compact arrangement, providing both small and large particle protection without significantly increasing device complexity.
2Reliability
If elastic sealing elements are used, then protection against particle penetration is improved, but reliability decreases due to damage from heavy duty use
Solution Approach 1:
The inner shield member functions as a flexible protective barrier that can deform to accommodate the reciprocating motion of the tool bit while maintaining its protective function. This flexible structure is more resistant to damage from heavy duty use compared to rigid elastic sealing elements.
3Reliability
If a plate-shaped transverse slide is used, then protection against small particles is improved, but ease of operation worsens due to alignment maintenance requirements
Solution Approach 1:
The inner shield member is designed to be movable within the channel, allowing it to dynamically adjust its position in response to tool bit reciprocation and particle impact. This dynamic capability eliminates the need for precise alignment maintenance while maintaining protective effectiveness.
4Reliability
If the protective device extends to exterior, then protection against larger particles is improved, but device complexity increases
Solution Approach 1:
The channel structure serves multiple functions simultaneously: it provides structural support for the inner shield member, directs particle flow away from internal components, and protects against both small and large particles. This multi-functionality reduces overall device complexity despite the extended protective coverage.
Data Source
AI summary
A protection assembly for a work implement includes an outer shield member and an inner shield member. The outer shield member is spaced from a housing of the work implement in a longitudinal direction and defines a channel. The channel extends to an exterior of the protection assembly. The inner shield member defines an opening and is slideably disposed in the channel. The inner shield member is free to slide in a transverse direction that is substantially perpendicular to the longitudinal direction. Movement of the inner shield member in the longitudinal direction is restricted by the housing of the work implement and the outer shield member. Movement of the inner shield member in the transverse direction is restricted by a work tool that is locked within and projects out of the housing and through the opening in the inner shield.