Working Machine Cooling Air Passage Design
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Solution Overview
Problem
Existing working machines face challenges in preventing foreign matters like dust from entering the machine while ensuring sufficient cooling for the electric motor, as the cooling air passage is disrupted when the air inlet and air outlet are not aligned.
Innovation Solution
The working machine design includes a configuration where the inner air inlet and inner air outlet overlap each other, allowing smooth airflow and preventing foreign matter entry by positioning the outer air inlet in the rear housing far from the working mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air inlet is positioned in the rear housing to prevent foreign matter entry, then reliability is improved, but the cooling air passage becomes disrupted and cooling efficiency deteriorates
Solution Approach 1:
The air inlet is divided into two separate inlets: an outer air inlet positioned in the rear housing for preventing foreign matter entry, and an inner air inlet positioned in the motor housing for efficient cooling airflow. This segmentation allows each inlet to fulfill its specific function without compromising the other.
Solution Approach 2:
The air passage is configured to extend in the width direction (lateral direction) of the working machine, connecting the outer air inlet in the rear housing to the inner air inlet in the motor housing. This dimensional change allows the air passage to bypass the working mechanism area while maintaining efficient cooling airflow.
2Reliability
If the cooling air passage extends through the rear housing to the outer air inlet, then reliability is improved, but the air flow becomes less smooth and cooling efficiency deteriorates
Solution Approach 1:
The air inlet system is segmented into outer and inner inlets with dedicated functions. The outer air inlet handles foreign matter prevention while the inner air inlet handles cooling airflow intake, allowing each to be optimally positioned without compromising the other.
Solution Approach 2:
The air passage extends in the width direction rather than the front-rear direction, creating a direct and smooth airflow path from the outer air inlet to the inner air inlet that avoids disruption to the cooling efficiency.
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 ensures sufficient cooling for the electric motor by maintaining smooth airflow and prevents foreign matters from entering the machine, thus enhancing both cooling efficiency and machine reliability.
Implementation Method 1
A cooling air passage is defined to extend from the air inlet to the air outlet via the inside of the rear housing
Implementation Method 2
the air flowing out of the inner air outlet smoothly flows into the inner air inlet
Data Source
AI summary
A working machine may include a working unit including a working mechanism, an electric motor, and a motor housing, a control unit, a base, a rear housing, a front handle, and a rear handle. The base may include a passage. The motor housing may include an inner air inlet and an outer air outlet. The rear housing may include an outer air inlet and an inner air outlet. A cooling air passage may be defined in which air flows from the outer air inlet to the outer air outlet through an inside of the rear housing, the inner air outlet, the inside of the passage, the inner air inlet, and an inside of the motor housing. As viewed along a front-rear direction, the inner air inlet and the inner air outlet may overlap each other.