Speed Reducer Fan Hood with Flow Straightening Fins
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Solution Overview
Problem
Existing speed reduction apparatuses face inefficiencies in cooling performance due to insufficient air flow straightening, leading to potential damage from high temperatures, particularly affecting bearings and oil film reduction.
Innovation Solution
The design incorporates a fan hood with a trumpet-like portion and flow straightening fins on its inner surface, which straightens the air flow and directs it parallel to the exterior casing surface, enhancing cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling fan is provided on the input shaft, then cooling function is provided, but cooling performance is insufficient due to inadequate air flow straightening
Solution Approach 1:
The fan hood is divided into multiple functional sections: a cylindrical portion for general coverage, a trumpet-like portion for flow direction control, and flow straightening fins for air flow optimization. This segmentation allows each part to perform its specific function effectively, improving overall cooling performance
Solution Approach 2:
Flow straightening fins are introduced as an intermediary element between the fan and the air flow path. These fins act as a mediator that organizes and straightens the air flow, enhancing the cooling efficiency without requiring changes to the fan itself
2Reliability
If the fan hood covers the fan completely, then protection is provided, but air flow straightening is insufficient
Solution Approach 1:
The fan hood is designed with different local qualities: the cylindrical portion provides complete coverage and protection, while the trumpet-like portion with flow straightening fins provides localized air flow optimization. This local differentiation allows the hood to simultaneously provide protection and improve cooling performance
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 configuration improves cooling effects for the input shaft and other high-rotational-speed components, reducing the risk of damage from high temperatures and extending the lifespan of bearings and seals.
Implementation Method 1
a fan provided on the protruding portion of the input shaft
Implementation Method 2
A flow straightening fin is provided on an inner surface of the trumpet-like portion
Implementation Method 3
This configuration improves cooling effects for the input shaft and other high-rotational-speed components
Data Source
AI summary
Disclosed is a speed reduction apparatus including: a casing that accommodates a speed reduction mechanism; an input shaft including a protruding portion protruding from the casing to the outside; a fan provided on the protruding portion of the input shaft; and a fan hood that covers the fan. The fan hood includes a cylindrical portion, and a trumpet-like portion that is connected to the cylindrical portion, and includes an inner surface inclined to be separated away from the input shaft toward a load side. A flow straightening fin is provided on an inner surface of the trumpet-like portion.