Electric Oil Pump Internal Discharge Passages
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Solution Overview
Problem
Conventional electric oil pumps require external piping for multiple discharge passages, leading to increased size, weight, and limited layout flexibility, which hinders space-saving and weight reduction goals.
Innovation Solution
The electric oil pump design features separate first and second discharge passages within the pump body, eliminating the need for external piping and allowing for direct oil pressure supply to multiple positions, with check valves and an orifice to prevent backflow and optimize layout freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If oil discharged from the discharge-side opening is circulated to a pump discharge-side pressure chamber provided outside the pump body, then oil can be supplied to multiple positions, but the outer size is enlarged and weight is increased
Solution Approach 1:
The patent integrates the pressure chamber and multiple discharge passages within the pump body itself, merging functions that were previously separated into external components. This eliminates the need for external piping while maintaining the capability to supply oil to multiple positions, thereby reducing weight and outer size.
Solution Approach 2:
The patent nests the pressure chamber and multiple discharge passages inside the pump body, creating a compact nested structure. The first and second discharge passages are arranged within the pump body's internal volume, allowing multiple oil supply paths without increasing external dimensions, thus reducing both weight and spatial footprint.
2Adaptability or versatility
If external pipes are used to connect discharge passages to external positions, then oil can be supplied to multiple positions, but the outer size is enlarged and layout flexibility is reduced
Solution Approach 1:
The patent combines multiple discharge passages and their connection points within the pump body's internal structure, eliminating the need for external piping. This integration reduces the pump's outer size while maintaining the versatility to supply oil to multiple external positions through the streamlined internal passage system.
Solution Approach 2:
The patent utilizes three-dimensional space within the pump body to route multiple discharge passages in different directions, allowing oil to be supplied to multiple positions without extending the pump's external dimensions. This internal spatial arrangement enables compact design with enhanced layout flexibility.
3Adaptability or versatility
If multiple discharge passages are provided outside the pump body, then oil can be supplied to multiple positions, but manufacturing complexity increases
Solution Approach 1:
The patent merges multiple discharge passages and their associated connection structures into a single integrated pump body component. This consolidation reduces the number of separate parts that need to be manufactured and assembled, thereby simplifying the manufacturing process while maintaining the capability to supply oil to multiple positions.
Solution Approach 2:
The pump body is designed as a multi-functional component that simultaneously houses the pressure chamber and provides multiple discharge passages for different oil supply destinations. This universal design eliminates the need for separate external piping components, reducing manufacturing complexity while achieving versatile oil distribution.
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 enables a compact, lightweight, and cost-effective electric oil pump with improved layout flexibility and reduced manufacturing complexity, ensuring efficient oil distribution and protection against backflow.
Implementation Method 1
a first check valve opened/closed according to a pressure of oil discharged from the discharge port is provided in the first discharge passage, and a second check valve opened/closed according to a pressure of oil discharged from the discharge port is provided in the second discharge passage
Data Source
Figure 1A~1B
Figure 2
Figure 3~4
AI summary
An electric oil pump (1) includes a rotor (10) driven to rotate by a motor (13) and a pump body (20) having a pump chamber (30) accommodating the rotor (10), an intake port (40) for introducing oil into the pump chamber (30) according to rotation of the rotor (10), a discharge port (50) for discharging oil from the pump chamber (30) according to rotation of the rotor (10), a first discharge passage (60) communicated to a first communication hole (52) provided in the discharge port (50) and circulating oil discharged from the discharge port (50), the first discharge passage (60) having a smaller cross sectional area than the discharge port (50), and a second discharge passage (70) communicated to a second communication hole (54) provided in the discharge port (50) separately from the first communication hole (52) and circulating oil discharged from the discharge port (50), the second discharge passage (70) having a smaller cross sectional area than the discharge port (50).