Excavator Cooling Layout With Separate Electrical and Hydraulic Rooms
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Solution Overview
Problem
Existing power-operated hydraulic excavators face challenges in efficiently cooling electrical and hydraulic equipment due to differing temperature bands required for each type of equipment, leading to inefficient cooling when both are cooled together by a single cooling device.
Innovation Solution
The implementation of a power-operated construction machine design that includes separate cooling devices for electrical and hydraulic equipment, with a partition member dividing the exterior cover into distinct rooms for each type of equipment, allowing for individualized cooling using dedicated cooling fans and devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electrical equipment and hydraulic equipment are cooled together by a single cooling device, then the structure is simple and device complexity is reduced, but cooling efficiency deteriorates because different temperature bands cannot be satisfied simultaneously
Solution Approach 1:
The patent divides the cooling system into separate electrical equipment cooling device and hydraulic equipment cooling device, with corresponding partitioned spaces in the exterior cover. This segmentation allows each equipment type to be cooled independently at its optimal temperature band, resolving the contradiction between structural simplicity and cooling efficiency.
2Volume of moving object
If electrical equipment and hydraulic equipment are accommodated in the same space, then the space utilization is improved, but temperature control deteriorates due to different use temperature bands
Solution Approach 1:
The exterior cover is partitioned into electrical equipment room and hydraulic equipment room using partition members, creating separate temperature zones while maintaining compact overall structure. This allows independent temperature control for each equipment type.
Solution Approach 2:
Different thermal environments are created in different regions of the exterior cover - the electrical equipment room maintains temperatures suitable for electronic components while the hydraulic equipment room accommodates higher temperatures from hydraulic operations.
3Ease of manufacture
If a single cooling fan is used for both electrical and hydraulic equipment, then the number of components is reduced and ease of manufacture is improved, but cooling performance deteriorates for equipment with different temperature requirements
Solution Approach 1:
The cooling system is segmented into separate cooling fans for electrical equipment and hydraulic equipment, allowing each fan to be optimized for its specific equipment type's thermal characteristics and temperature requirements.
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 solution enables efficient cooling of both electrical and hydraulic equipment by allowing each to be cooled within its optimal temperature band, enhancing the reliability and performance of the power-operated hydraulic excavator.
Implementation Method 1
the cooling fan is disposed in the machine room, and the electrical equipment and the hydraulic equipment are cooled by cooling wind caused by this cooling fan
Implementation Method 2
the power-operated hydraulic excavator is provided with a cooling device including a heat exchanger and a cooling fan mounted thereon, wherein the electrically powered equipment and the hydraulic equipment are cooled by the cooling device
Data Source
AI summary
An upper revolving structure (4) of an electric hydraulic excavator (1) includes a revolving frame (7), an operator's seat (10), an electric motor (15), a hydraulic pump (17) driven by the electric motor (15), an oil tank (18), and an exterior cover (20) disposed in the revolving frame (7) to cover electrical equipment including the electric motor (15) and hydraulic equipment including the hydraulic pump (17) and the oil tank (18). A partitioning member (25) that is disposed in the revolving frame (7) to partition an inside of the exterior cover (20) into an electrical equipment room (28) and a hydraulic equipment room (29). An electrical equipment cooling device (31) including an electrical equipment cooling fan (34) is disposed in the electrical equipment room (28), and a hydraulic equipment cooling device (35) including a hydraulic equipment cooling fan (37) is disposed in the hydraulic equipment room (29).