Bidirectional Oil Pump With Fixed Ports and Eccentric Switching
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Solution Overview
Problem
Conventional oil pumps require structural changes in suction and discharge areas when the power source rotates forwardly and reversely, which complicates their design and increases economic costs.
Innovation Solution
An oil pump design that includes a pump module with a rotary shaft, inner and outer rotors, an inlet, and an outlet, along with a direction switching unit that maintains an eccentric distance between the rotary shaft and the outer rotor, allowing for stable direction switching without changing the suction and discharge area positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the oil pump structure is changed according to forward and reverse rotation, then the pump can adapt to different rotation directions, but the device complexity and manufacturing cost increase
Solution Approach 1:
The pump body is designed with a universal structure that can handle both forward and reverse rotation directions without requiring structural changes. The suction port and discharge port are positioned to allow the pump to function in both rotation directions, making the pump adaptable to different power source configurations (internal combustion engines that rotate in one direction and electric motors that can rotate in both directions).
Solution Approach 2:
Instead of changing the pump structure to adapt to different rotation directions, the invention inverts the approach by designing a fixed pump structure that naturally accommodates both rotation directions. The suction and discharge ports are arranged so that the pump operates effectively regardless of rotation direction, eliminating the need for structural modifications.
2Adaptability or versatility
If the suction port and discharge port positions are changed for reverse rotation, then the pump can discharge fluid in reverse direction, but the ease of manufacture and installation deteriorate
Solution Approach 1:
The pump body incorporates a universal port arrangement where the suction port and discharge port are positioned to enable fluid discharge in both forward and reverse rotation directions. This universal design allows the same pump component to be used for both rotation directions without requiring different port configurations or additional manufacturing steps.
3Adaptability or versatility
If additional parts are added to enable reverse rotation discharge, then the pump can operate in both directions, but the device complexity and economic feasibility worsen
Solution Approach 1:
The pump achieves bidirectional operation capability through a universal pump body design with appropriately positioned suction and discharge ports, eliminating the need for additional parts such as check valves, direction switching mechanisms, or separate pump units for forward and reverse rotation. The existing components are configured to naturally accommodate both rotation directions.
Solution Approach 2:
The pump structure itself provides the bidirectional functionality without requiring external assistance or additional components. The port arrangement and internal geometry of the pump body are designed to automatically adapt to the rotation direction, allowing the pump to serve both forward and reverse rotation applications with its existing structure.
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 oil pump can operate efficiently in both forward and reverse rotations without altering the suction and discharge area positions, enhancing its application range, simplicity, and economic feasibility while effectively cooling heat generated in power transmission parts.
Implementation Method 1
a direction switching unit (1550) coupled between the housings (1100, 1300) and the outer rotor (1530) to keep an eccentric distance between the rotary shaft (1570) or a central axis line of the inner rotor (1510) and a central axis line of the outer rotor (1530)
Implementation Method 2
an outer rotor (1530) rotated engaging with the inner rotor (1510)
Data Source
AI summary
Disclosed is an oil pump including: a pump module provided with a rotary shaft, an inner rotor coupling with the rotary shaft, an outer rotor rotated engaging with the inner rotor, an inlet for sucking fluid, and an outlet for pressing and discharging the sucked fluid; housings supporting the pump module; and a direction switching unit coupled between the housings and the outer rotor to keep an eccentric distance between the rotary shaft or a central axis line of the inner rotor and a central axis line of the outer rotor. According to the disclosure, there is provided an oil pump used for both forward rotation and reverse rotation, which does not require changing a suction area and a discharge area and direction switching is stably performed even when a power source rotates forwardly and reversely.