Compact Oil Pump with Arcuate Filter and Parallel Valve
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Solution Overview
Problem
Existing oil pump designs for small vehicles face challenges in incorporating an oil filter without increasing the pump's size, especially when integrated with a variable flow rate system that includes a pressure regulating valve, as they require complex oil paths to accommodate the filter.
Innovation Solution
The oil pump features a trochoidal tooth profile with parallel axes for the pump sections and hydraulic pressure regulating valve, incorporating a plate-shaped oil filter that curves along the outer periphery of the pump rotors, surrounded by an elastic outer peripheral frame with an iron core, allowing efficient placement without increasing the pump's size and enhancing filtering area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a plate-shaped oil filter is disposed in the relief path traversing obliquely, then the filter area is increased, but the oil pump size becomes large
Solution Approach 1:
The oil filter is repositioned from a linear arrangement in the relief path to a radial arrangement around the rotor. By transitioning from one-dimensional path traversal to two-dimensional radial positioning, the filter utilizes the circumferential space around the rotor, increasing filter area without proportionally increasing the pump's axial length.
Solution Approach 2:
The oil filter is designed with an arcuate shape that follows the curved surface around the rotor. This curved configuration allows the filter to wrap around the rotor in a circular path, maximizing the use of available radial and circumferential space while maintaining a compact overall pump dimensions.
2Adaptability or versatility
If a pressure regulating valve is added to create variable flow rate, then the delivery rate control is improved, but the oil pump size increases
Solution Approach 1:
The pressure regulating valve is integrated directly into the pump housing, merging the valve function with the pump structure. This integration eliminates the need for separate valve assemblies and reduces the overall space required, allowing variable flow rate control without significant increase in pump size.
Solution Approach 2:
The pressure regulating valve is positioned within the internal cavity of the pump housing, nesting the valve mechanism inside the pump body. This nested arrangement allows the valve to occupy space that would otherwise be unused, enabling flow control functionality without adding external dimensions to the pump.
3Ease of manufacture
If the oil filter is disposed in the complicated oil path between pump units and pressure regulating valve, then the filter placement is achieved, but the pump size becomes large
Solution Approach 1:
The oil filter is extracted from the complex internal oil path between pump units and the pressure regulating valve, and repositioned to a dedicated location around the rotor. This extraction simplifies the oil path routing and provides a more straightforward manufacturing approach for filter installation while maintaining compact pump dimensions.
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 reduces the oil pump's size, maintains spool valve operation, prevents vibration and noise, ensures reliable filter placement, and enhances the stiffness of the filter frame, thereby preventing oil leaks and improving the flexibility in pump placement.
Implementation Method 1
the plate-shaped oil filter (77) is curved arcuately along an outer periphery of pump rotors (36d, 37d) as viewed from an axial direction of the pump sections (36, 37)
Implementation Method 2
the plate-shaped oil filter (77) includes a strainer having an outer periphery surrounded by an outer peripheral frame (77c) formed of an elastic material
Implementation Method 3
the outer peripheral frame (77c) has a distal end tapered in a direction in which the plate-shaped oil filter (77) is inserted into the oil pump (31). In addition, the oil pump (31) includes an inserting portion (78) formed into a taper so as to properly receive the outer peripheral frame (77c) therein
Data Source
AI summary
In an engine having an oil pump wherein an oil filter is incorporated into the oil pump without allowing the oil pump to become large in size. An oil pump and a hydraulic line changeover valve including a spool valve are disposed so as to have axes extending in parallel with each other. The oil pump has a plate-shaped oil filter disposed at a discharge port thereof. The plate-shaped oil filter is curved arcuately along an outer periphery of a pump rotor as viewed from a pump axial direction.