Auxiliary Pump Cooling for Spaced Hydraulic Units
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Solution Overview
Problem
Conventional working vehicles with hydraulic pump and motor units spaced apart suffer from inadequate cooling, leading to increased temperatures and reduced transmission efficiency of the hydraulic fluid, affecting the performance of the hydraulic pump and motor units.
Innovation Solution
Incorporating an auxiliary pump unit with a circulation line and an oil cooler to recirculate and cool the hydraulic fluid, which is positioned between the auxiliary pump and either the pump or motor case, effectively preventing temperature rises in the hydraulic pump and motor units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the hydraulic pump unit and hydraulic motor unit are spaced apart to enhance design freedom, then the degree of freedom in design is improved, but the cooling efficiency of the hydraulic motor unit deteriorates
Solution Approach 1:
The invention divides the cooling function into two parts: the original hydraulic pump unit cooling and an additional auxiliary pump unit dedicated to cooling the hydraulic motor unit. This segmentation allows the cooling system to be optimized independently for each component, resolving the contradiction by maintaining design freedom while improving cooling efficiency through functional separation.
Solution Approach 2:
The invention introduces a circulation line as an intermediary medium to transport cooled oil from the auxiliary pump unit to the hydraulic motor unit. This intermediary mechanism enables thermal management between spatially separated components, allowing the hydraulic motor unit to be positioned away from the pump unit while maintaining effective cooling through the circulating oil medium.
2Adaptability or versatility
If the hydraulic pump unit and hydraulic motor unit are spaced apart, then design flexibility is improved, but the cooling efficiency of the hydraulic pump unit deteriorates
Solution Approach 1:
The invention segments the cooling function by introducing a dedicated auxiliary pump unit that works in parallel with the original hydraulic pump unit. This allows independent optimization of cooling for the hydraulic pump unit while maintaining design flexibility, as the auxiliary cooling system can be configured separately without constraining the main hydraulic system layout.
3Adaptability or versatility
If the hydraulic motor unit is spaced apart from the hydraulic pump unit, then design freedom is improved, but the transmission efficiency of the HST deteriorates due to temperature rise
Solution Approach 1:
The circulation line acts as an intermediary that transports cooled oil from the auxiliary pump unit to the hydraulic motor unit, enabling thermal management between spatially separated components. This maintains transmission efficiency by preventing temperature rise in the hydraulic fluid, even when the motor unit is positioned away from the pump unit for design freedom.
Solution Approach 2:
The auxiliary pump unit performs preliminary cooling action on the hydraulic oil before it reaches the hydraulic motor unit. By pre-cooling the oil through the circulation line, the system prevents temperature rise that would otherwise occur during motor operation, thereby maintaining transmission efficiency despite the spatial separation.
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 enhances the cooling efficiency of both the hydraulic pump and motor units, maintaining the transmission efficiency of the hydraulic system and preventing overheating.
Implementation Method 1
an oil cooler interposed in the circulation line so as to be positioned between the auxiliary pump main body and the pump case or the motor case
Data Source
AI summary
There is provided a working vehicle including: a hydraulic pump unit including a hydraulic pump main body operatively driven by a driving power source, and a pump case accommodating the hydraulic pump main body and having an inner space capable of storing oil; a hydraulic motor unit spaced apart from the hydraulic pump unit so as to operatively drive a corresponding driving wheel, the hydraulic motor unit including a hydraulic motor main body fluidly connected to the hydraulic pump main body so as to form an HST in cooperation with the hydraulic pump main body, and a motor case accommodating the hydraulic motor main body and having an inner space capable of storing oil; an auxiliary pump unit including an auxiliary pump main body operatively driven by the driving power source; a circulation line for fluidly connecting the auxiliary pump main body, the pump case and the motor case so that at least a part of oil, which has been discharged from the auxiliary pump main body, returns to a suction side of the auxiliary pump main body through the inner spaces of the pump case and the motor case; and an oil cooler interposed in the circulation line so as to be positioned. between the auxiliary pump main body and the pump case or the motor case.