Working Vehicle Cooling Layout for Downstream Cooler Efficiency
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Solution Overview
Problem
The cooling efficiency of the second cooling device in a working machine is reduced due to the increased temperature of cooling air from the first cooling device, and the existing light system in the working machine cannot effectively illuminate the digging direction during operations.
Innovation Solution
The working machine incorporates a first cooling device with a heat-exchange suppressing portion near the rotation center of the cooling fan, and a light support mechanism that allows the direction of the light to be changed around a vertical axis, enabling better illumination during operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the first cooling device is disposed upstream of the second cooling device in the cooling air flow passage, then the first cooling device can cool the fluid effectively, but the temperature of cooling air increases and the cooling efficiency of the second cooling device is reduced
Solution Approach 1:
The first cooling device is divided into a heat-dissipating portion with fins and a non-heat-dissipating portion without fins. The non-heat-dissipating portion is positioned at the region corresponding to the rotation center of the cooling fan, where it allows cooling air to pass through without significant heat exchange, thereby preventing excessive temperature increase of the cooling air that would reduce the efficiency of the second cooling device downstream.
Solution Approach 2:
Different portions of the first cooling device have different thermal exchange properties. The heat-dissipating portion with fins is located away from the rotation center to effectively cool the fluid, while the non-heat-dissipating portion without fins is positioned at the rotation center region to allow cool air passage. This local differentiation resolves the contradiction between effective cooling and maintaining low cooling air temperature.
2Illumination intensity
If the light is in a fixed state, then the structure is simple, but the light cannot illuminate the digging direction or may cause glare when the working device rotates
Solution Approach 1:
The light is mounted on a light support mechanism that allows the light direction to be changed around a vertical axis. This dynamic adjustment capability enables the light to illuminate the digging direction during working operations, resolving the contradiction between fixed simple structure and adaptive illumination requirements.
3Object-affected harmful factors
If the light is in a fixed state, then the structure is simple, but the light may reflect off the working device and cause glare
Solution Approach 1:
The light support mechanism enables dynamic adjustment of the light direction. By changing the illumination angle, the system可以避免 light reflecting off the working device and causing glare, while maintaining structural simplicity through a relatively straightforward rotational mounting mechanism.
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
The heat-exchange suppressing portion enhances the cooling efficiency of the second cooling device, while the adjustable light system improves illumination during digging operations, addressing both cooling efficiency and lighting directionality issues.
Implementation Method 1
a cooling fan F1; and a first cooling device O1 and a second cooling device R1 that are disposed in series in a flow passage of cooling air 81 that is generated by the cooling fan F1
Implementation Method 2
a heat-exchange suppressing portion 95 that is provided at a portion corresponding to a region near a rotation center F2 of the cooling fan F1 and that suppresses heat exchange between the cooling air 81 and a fluid that flows in the first cooling device O1
Implementation Method 3
The first cooling device may have a heat-dissipating portion where a fin for heat-dissipation is provided
Data Source
AI summary
A working machine includes a cooling fan, and a first cooling device and a second cooling device that are disposed in series in a flow passage of cooling air that is generated by the cooling fan. The first cooling device is disposed upstream of the second cooling device in a direction of flow of the cooling air, and has a heat-exchange suppressing portion that is provided at a portion corresponding to a region in a rotation center vicinity of the cooling fan and that suppresses heat exchange between the cooling air and a fluid that flows in the first cooling device.