Tool Bushing Lubrication via Transverse Channels
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Solution Overview
Problem
Existing lubricating arrangements for tool bushings in breaking hammers are inefficient in delivering lubricant to critical areas, leading to inadequate lubrication and increased wear.
Innovation Solution
The tool bushing features transverse lubricating channels connecting the outer surface to inner lubricating grooves, creating localized lubricated areas on opposite sides of the inner surface, with lubricant fed diagonally to critical areas to prevent lubricant escape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If lubricating grooves surround the entire inner periphery of the tool bushing, then lubricant can be delivered to all areas, but lubricant escapes from heavily loaded bearing areas to non-critical areas, reducing lubrication effectiveness
Solution Approach 1:
The patent applies local quality by providing lubricating grooves only in specific heavily loaded areas of the inner surface rather than surrounding the entire periphery. This ensures lubricant is delivered precisely where needed (critical bearing areas) while preventing its escape to non-critical areas, thus resolving the contradiction between comprehensive lubrication coverage and lubricant retention.
2Reliability
If transverse lubricating channels are used to deliver lubricant to inner surface, then lubricant can reach critical bearing areas, but lubricant flow to non-critical areas increases, wasting lubricant
Solution Approach 1:
The patent segments the lubrication system by dividing the inner surface into distinct lubricated and non-lubricated areas. Transverse lubricating channels deliver lubricant to specific segmented zones (heavily loaded bearing areas) while dedicated lubricating grooves confine the lubricant flow, preventing it from reaching non-critical areas and thus reducing lubricant waste.
3Reliability
If lubricating grooves are extended to surround the periphery, then complete coverage is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent simplifies manufacturing by applying lubricating grooves only in local heavily loaded areas rather than creating continuous peripheral grooves. This local quality approach reduces the complexity of groove configuration and machining operations while still achieving adequate lubrication coverage where it is most needed.
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 solution ensures proper lubrication of heavily loaded areas, reducing wear and extending the service life of tool bushings and breaking tools, while being easily manufacturable and retrofittable.
Implementation Method 1
transverse lubricating channels extending from an outer surface of the tool bushing to an inner surface. The lubricating channels are in fluid connection with lubricating grooves arranged on the inner surface
Data Source
Figure 1~2
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Figure 7~8
AI summary
A tool bushing of a breaking hammer, an arrangement for lubricating tool bushings of a breaking hammer, a breaking hammer, and a method of lubricating tool bushings of a breaking hammer. The tool bushing (8, 8a, 8b) is a sleeve-like piece comprising lubricating grooves (17) on its inner surfaces whereby lubricant is feedable through transverse lubricating channels (13) to the lubricating grooves for lubricating bearing surfaces on the inner surface. The lubricating grooves are arranged to form at least two local lubricated areas (La1, La2; La3, La4) opposing each other. The local lubricating areas have dedicated lubricating grooves which do not surround a periphery of the inner surface.