Variable Oil Pump Outer Ring Stabilization
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Solution Overview
Problem
In high-speed sections, general variable hydraulic pumps experience reduced capacity due to the outer ring moving by itself, leading to low oil pressure, which can compromise engine durability, especially under severe driving conditions.
Innovation Solution
A variable hydraulic pump design with a rotor, pivot pin, outer ring, and spring configuration where specific angles between imaginary lines and the pivot pin position are optimized to maintain the spring's supporting force without increasing spring tension, ensuring stable oil pressure by controlling the movement of the outer ring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spring reaction force is increased to prevent outer ring movement, then the stability of oil pressure is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent changes the geometric parameters of the system, specifically the angle between the imaginary line connecting the rotor center and pivot pin, and the imaginary line connecting the ring spring end and pivot pin. By optimizing these angular parameters, the spring reaction force is enhanced without changing spring specifications, thereby preventing outer ring movement and maintaining stable oil pressure without increasing device complexity
Solution Approach 2:
The patent introduces a new dimensional parameter - the angular relationship between imaginary lines - to solve the problem. Instead of increasing spring force in one dimension, the solution operates in the angular dimension, creating a geometric configuration that naturally generates the required stabilizing force
2Reliability
If the spring constant is increased to prevent outer ring movement, then the stability of oil pressure is improved, but the ease of manufacture deteriorates
Solution Approach 1:
The patent changes geometric parameters (angles between imaginary lines) rather than physical parameters (spring constant). This allows the system to achieve the desired effect of preventing outer ring movement without modifying spring specifications, thereby maintaining ease of manufacture while improving reliability
3Ease of operation
If the outer ring is allowed to move freely, then the ease of operation is improved, but the stability of oil pressure deteriorates in high-speed sections
Solution Approach 1:
The patent optimizes the angular parameters of the system configuration. By setting specific angle ranges between imaginary lines, the system maintains ease of operation allowing outer ring movement, while the optimized geometry ensures the spring reaction force is sufficient to prevent unwanted movement and maintain stable oil pressure
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 design effectively maintains oil pressure in high-speed sections, enhancing engine durability by stabilizing the outer ring's movement and preventing capacity reduction, even under severe conditions.
Implementation Method 1
a spring mounted between the housing spring end and the ring spring end to elastically support the outer ring
Implementation Method 2
a pressure chamber formed in the pump housing to push the outer ring according to the pressure formed therein
Data Source
AI summary
A variable hydraulic pump include a rotor mounted on a pump housing of which a housing spring end is formed, a pivot pin, an outer ring rotatably coupled to the pivot pin and of which a ring spring end is formed, a spring mounted between the housing spring end and the ring spring end, a pressure chamber formed in the pump housing to push the outer ring, a plurality of vane provided to form a plurality of pockets, an input port to supply oil to the plurality of pockets and a discharge port to exhaust oil supplied to the plurality of pockets, wherein at the reference position of the outer ring, the angle between a first imaginary line connecting the center of the rotor and the pivot pin and a second imaginary line connecting the ring spring end and the pivot pin is 0 to 10 degrees.