Vane Pump Cover Reinforcement via Iron Plate
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Solution Overview
Problem
Conventional vane pumps face issues with cover strength reduction due to thinner sections and require accurate dimensional control, leading to potential deformation, buckling, and oil leakage, especially under high pressure, and metallic contact issues causing seizing.
Innovation Solution
Incorporating an iron reinforcing plate between the cam ring and cover within the body bore, eliminating the need for a concave portion and ensuring increased cover thickness and strength, thus reducing distortion and improving volume efficiency without requiring precise dimensional control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a concave portion is formed in the cover to incorporate an outer side plate, then the strength of the cover is improved, but the contact area between the outer side plate and cover is reduced, leading to deformation and buckling under high pressure
Solution Approach 1:
The invention transitions from a two-dimensional surface contact (outer side plate contacting cover surface) to a three-dimensional volumetric support (inner side plate positioned within the body bore). This dimensional change allows the reinforcing plate to provide structural support through volume rather than surface contact, eliminating the need for large contact area while maintaining or improving strength.
Solution Approach 2:
The inner side plate acts as an intermediary structural element positioned between the body bore and the cover. It mediates the load transmission and provides reinforcing support to the cover without requiring direct surface contact with the outer side plate, thus resolving the contradiction between strength enhancement and contact area reduction.
2Ease of manufacture
If the thickness of the cover is reduced to incorporate an outer side plate, then the outer side plate can be fitted, but the strength of the thinner portion of the cover is reduced, making deformation and buckling more likely
Solution Approach 1:
Instead of reducing cover thickness to accommodate the reinforcing plate from the outside (conventional approach), the invention inverts the approach by positioning the reinforcing plate (inner side plate) from the inside of the body bore. This inversion allows the cover to maintain its original thickness and strength while still incorporating the reinforcing structure.
3Manufacturing precision
If accurate dimensional control is applied to the cover for incorporating an outer side plate, then perpendicularity and clearance are maintained, but manufacturing complexity and cost increase
Solution Approach 1:
The inner side plate is designed to self-position within the body bore through its geometric fit and structural configuration. This self-positioning capability eliminates the need for complex external fixtures or precise dimensional control during assembly, allowing the component to maintain proper orientation and clearance through its own design features rather than relying on high-precision manufacturing processes.
Data Source
AI summary
A body bore 2 formed in a body 1 is closed with a cover 9, as well as a cam ring 4 is incorporated into the body bore 2, and a rotor 6 is arranged inside the cam ring 4. Vanes 7 move in and out along an inner surface of the cam ring 4 with rotation of the rotor 6. An iron reinforcing plate 8 is interposed inside the body bore 2 between the cam ring 4 and the cover 9.