Multi-Stage Trochoid Pump Hydraulic Circuit for Transmission Oil Pressure Stabilization
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Solution Overview
Problem
Existing hydraulic circuits for transmissions face complexity and increased costs due to the need for multiple oil pathways and pumps, and struggle to stabilize oil pressure due to air entrainment, which can lead to operational failures and pressure drops.
Innovation Solution
A hydraulic circuit design featuring a pump apparatus with a low-pressure oil discharging unit that separates air bubbles and directs them to a lubricating oil pathway, and a high-pressure oil discharging unit that increases pressure for the hydraulic control pathway, using a multi-stage trochoid pump to simplify the circuit and prevent air entrainment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sub pump and separate oil pathways are added to prevent air bubble intrusion, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines the main pump and sub pump functions into a single integrated pump unit. The pump unit includes a main pump section and a sub pump section that share a common structure and control system, thereby preventing air bubble intrusion without requiring completely separate pump systems and oil pathways.
Solution Approach 2:
The integrated pump unit serves multiple functions: it acts as both the main pump for primary oil supply and the sub pump for supplementary oil supply and air bubble removal. This multi-functional design eliminates the need for dedicated separate pump systems while maintaining the ability to prevent air entrainment.
2Reliability
If multiple oil pathways are created for air bubble separation, then oil pressure stability is improved, but manufacturing cost increases
Solution Approach 1:
The patent integrates the oil pathways for main supply and sub supply into a unified pathway system within the pump unit. The main oil pathway and sub oil pathway are combined in structure and control, reducing the number of separate components and assembly steps required, thereby lowering manufacturing costs while maintaining oil pressure stability.
3Reliability
If oil is discharged to a position only accessible by the sub pump, then air bubble intrusion into the main pump is suppressed, but device complexity increases
Solution Approach 1:
The patent merges the discharge positions of the main pump and sub pump into a common discharge pathway. The main oil discharge port and sub oil discharge port are integrated into a unified discharge system, allowing air bubble prevention functionality without requiring completely separate discharge locations and pathways.
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 stabilizes oil pressure, prevents operational failures, and simplifies the hydraulic circuit while improving lubrication and cooling performance, reducing the risk of air bubble intrusion and maintaining stable oil pressure.
Implementation Method 1
a low-pressure oil discharging unit having an air bubble-containing oil discharging part configured to separate an air bubble from the oil sucked from the collecting part
Implementation Method 2
a high-pressure oil discharging unit having a high-pressure oil discharging part configured to increase pressure of the oil supplied from the low-pressure oil discharging part
Data Source
AI summary
Provided is a hydraulic circuit for transmissions with which, while suppressing the hydraulic circuit from becoming complicated, it is possible to suppress an operational failure and a drop in the oil pressure of the hydraulic circuit, and to stabilize an oil pressure in the hydraulic circuit. The CVT 1 includes a part to be lubricated and a hydraulic control part for controlling transmission. The hydraulic circuit for transmissions includes a hydraulic oil pathway 3 for supplying oil from the pump apparatus 8 to the hydraulic control part 2, and a lubricating oil pathway 5 for supplying oil containing an air bubble to the part to be lubricated 4. The pump apparatus 8 includes a multi-stage trochoid pump 9 and has an air bubble-containing oil discharging part 11 for discharging the oil containing an air bubble to the first stage trochoid pump part 6. The air bubble-containing oil discharging part 11 is connected to the lubricating oil pathway 5. The second stage trochoid pump part 7 increases pressure of the oil discharged from the first stage trochoid pump part 6, and discharges it from the high-pressure oil discharging part 13. The hydraulic oil pathway 3 is connected to the high-pressure oil discharging part 13.