Chain Saw Bolt Heat Dissipation via Oil Tank
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Solution Overview
Problem
Chain saws experience high temperatures in the nut due to frictional heat from the guide bar, posing a risk of the nut being touched by operators without them realizing it, especially with electric motor-driven models lacking high-temperature components.
Innovation Solution
Incorporating a heat dissipating structure within the oil tank that uses heat dissipating fins or flexible members made of metallic materials to dissipate heat from the bolt to the oil, ensuring the nut remains at a lower temperature by increasing the contact area for heat transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the nut is used to fix the guide bar to the housing, then the guide bar is securely attached, but the nut becomes hot due to heat transfer from the guide bar, creating a safety hazard
Solution Approach 1:
The patent introduces a heat dissipation structure as an intermediary between the bolt and the oil tank. This structure mediates the heat transfer process by providing a dedicated pathway for heat to move from the bolt (which receives heat from the guide bar through the nut) into the oil, preventing direct heat accumulation in the nut while maintaining the mechanical connection.
Solution Approach 2:
The patent utilizes the hydraulic medium (oil) in the oil tank as a heat sink. The oil circulates or remains in contact with the heat dissipation structure, absorbing thermal energy through convection and conduction. This hydraulic approach effectively removes heat from the fastening system without compromising the mechanical attachment function.
2Stability of the object's composition
If the bolt penetrates the guide bar and connects to the housing, then the guide bar is fixed securely, but heat from the guide bar transfers to the bolt and nut, causing high temperatures
Solution Approach 1:
The heat dissipation structure serves as an intermediary thermal pathway, separating the thermal problem from the mechanical function. It provides a dedicated route for heat to escape from the bolt into the oil, allowing the bolt-nut-g guide bar assembly to maintain stable mechanical connection while the thermal load is managed independently through the intermediary heat dissipation structure.
Solution Approach 2:
The patent changes the thermal parameters of the system by introducing a heat dissipation structure with high thermal conductivity materials. This structure modifies the heat transfer parameters, increasing the rate of heat removal from the bolt and preventing temperature buildup that would otherwise occur in the fastening components.
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
Effectively reduces the temperature of the nut by dissipating heat to the oil, enhancing operator safety and maintaining efficient lubrication even when oil levels decrease, while reducing the risk of accidental high-temperature exposure.
Implementation Method 1
a heat dissipating structure configured to dissipate heat from the bolt to the oil in the oil tank
Implementation Method 2
the heat dissipating structure dissipates the heat of the bolt to the oil in the oil tank
Data Source
AI summary
A chain saw may include a saw chain, a guide bar to which the saw chain is attached, a sprocket configured to run the saw chain along a periphery of the guide bar, a prime mover configured to rotate the sprocket, an oil tank configured to store oil to be supplied to the saw chain, a housing that houses the prime mover and the oil tank, a bolt protruding from the housing and penetrating a hole disposed in the guide bar, a nut screwed onto the bolt to fix the guide bar to the housing, and a heat dissipating structure configured to dissipate heat from the bolt to the oil in the oil tank.