Spindle Lubrication System for Impact Tool Wear Reduction
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Solution Overview
Problem
Leakage of lubricant oil from the spindle in impact tools can lead to severe wear or seizure of components, resulting in a shorter service life.
Innovation Solution
The impact tool design includes a spindle with an internal space containing lubricant oil, a lid to seal the opening, and feed ports on the outer surface to supply oil between the spindle and hammer, reducing leakage and wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spindle contains lubricant oil in its internal space, then the lubrication between spindle and hammer is improved, but the risk of lubricant oil leakage increases
Solution Approach 1:
The internal space of the spindle is divided into a lubricant storage chamber and a working chamber separated by a partition wall. The lubricant storage chamber contains the lubricant oil, while the working chamber receives lubricant through feed ports. This segmentation prevents direct contact between the lubricant reservoir and the spindle-hammer interface, eliminating leakage risk while ensuring continuous lubrication supply.
Solution Approach 2:
A lid is introduced as an intermediary component to seal the opening of the spindle's internal space, preventing lubricant oil from leaking outward. The lid acts as a barrier between the lubricant reservoir and the external environment, while feed ports provide controlled pathways for lubricant delivery to the spindle-hammer interface.
2Reliability
If lubricant oil is supplied to between spindle and hammer, then wear and seizure are reduced, but the complexity of the lubrication system increases
Solution Approach 1:
The feed ports are integrated directly into the outer circumferential surface of the spindle, combining the lubrication delivery function with the spindle structure itself. The partition wall within the internal space merges the storage and delivery functions, eliminating the need for separate external lubrication components and reducing overall system complexity.
Solution Approach 2:
The spindle's internal structure includes self-contained lubrication features: the partition wall automatically directs lubricant flow, and the feed ports positioned on the outer circumferential surface enable self-lubrication as the spindle rotates. The system uses its own rotational motion to distribute lubricant evenly between the spindle and hammer without requiring external pumping mechanisms.
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 design effectively reduces wear and seizure, extending the service life of the impact tool by ensuring consistent lubrication between the spindle and hammer.
Implementation Method 1
a first feed port in an outer circumferential surface of the spindle; wherein the first feed port allows supply of the lubricant oil from the first space to between the spindle and the hammer
Data Source
AI summary
An impact tool is less likely to have a shorter service life. An impact tool includes a motor, a spindle, a hammer, an anvil, and a lid. The spindle is rotatable by the motor. The spindle has an opening in a rear end face of the spindle, an internal space extending frontward from the opening and including a first space containing a lubricant oil and a second space connecting to a rear end of the first space, and a first feed port in an outer circumferential surface of the spindle. The hammer surrounds the spindle. The anvil is strikable by the hammer in a rotation direction. The lid is placeable through the opening into the second space. The first feed port allows supply of the lubricant oil from the first space to between the spindle and the hammer.