Motor Case Ventilation Layout to Block Debris While Cooling
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Solution Overview
Problem
Existing walking work machines are vulnerable to foreign objects such as dust and trash entering the motor through air inlet ports for cooling, which can damage the internal components.
Innovation Solution
The design incorporates a motor case with a partition plate and ventilation ports positioned strategically to prevent foreign objects from entering the motor, featuring a suction port above the partition plate and an exhaust port below, along with a cooling fan that demarcates the motor's upper surface and provides a labyrinthine air path to filter out debris, ensuring air flows from lower to upper sections, preventing entry into the motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a ventilation port is provided for cooling air to flow into the case, then cooling efficiency is improved, but foreign objects such as dust or trash can enter the motor from the outside
Solution Approach 1:
The patent introduces a vertical dimension to the airflow path by positioning the ventilation port at the lower end and the suction port at the upper end of the case. This vertical arrangement creates a downward airflow direction that prevents foreign objects from entering the motor, while still achieving effective cooling through the temperature difference between lower and upper regions of the case.
Solution Approach 2:
Instead of the conventional approach where air enters near the heat-generating components and exits away, this patent inverts the airflow direction by having air enter at the lower ventilation port and be suctioned out at the upper suction port. This reversal creates a downward airflow that naturally prevents foreign objects from reaching the motor while maintaining cooling effectiveness.
2Object-affected harmful factors
If a partition plate is provided to separate air flow paths, then foreign object protection is improved, but device complexity increases
Solution Approach 1:
The patent divides the case interior into distinct regions using a partition plate that separates the lower region (with ventilation port) from the upper region (with suction port). This segmentation creates independent air flow paths that prevent foreign objects from traveling from the ventilation port to the motor, while maintaining a relatively simple overall structure.
Solution Approach 2:
The partition plate acts as an intermediary structure that mediates between the ventilation port and the motor area. It allows cooling air to pass through while blocking foreign objects, serving as a simple yet effective barrier that protects the motor without requiring complex filtration or sealing 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 configuration effectively inhibits foreign objects from reaching the motor, enhancing the cooling efficiency of the control device and preventing damage from debris, while maintaining effective airflow for cooling.
Implementation Method 1
a cooling fan that draws air into the air introduction member is provided between the motor and the air introduction member
Implementation Method 2
an air introduction member that cools a control device by causing air to flow
Data Source
AI summary
A work machine includes a housing, a motor positioned on an upper surface of the housing, a battery connected with the motor, and a blade to be driven by the motor. An air introduction member that cools a control device by causing air to flow is provided on an inside of a motor case. Plural bottom surface ventilation ports and plural side surface ventilation ports are provided in the motor case. Both of the ventilation ports cause air to flow into the inside of the motor case. The plural bottom surface ventilation ports and the plural side surface ventilation ports are disposed at positions lower than the air introduction member and the control device.