Cartridge Vane Pump O-Ring Biasing for Leak-Safe Compact Assembly
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Solution Overview
Problem
Existing cartridge vane pumps face challenges in reducing size and improving assemblability due to the need for springs to prevent oil leakage, which increase the pump's size and complicate assembly.
Innovation Solution
A cartridge vane pump design that uses an O-ring as both a sealing member and a biasing element, compressed between the side plate and the body, to prevent oil leakage without the need for additional springs, thereby reducing size and simplifying assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring is provided between the body and the side plate to bias the side plate towards the cam ring, then leakage prevention is improved, but the size of the pump increases and assembly complexity increases
Solution Approach 1:
The sealing member integrates multiple functions: it seals the gap between the side plate and cam ring, and simultaneously provides the biasing force through its elastic deformation. This combines the sealing function and spring function into a single component, eliminating the need for a separate spring and reducing pump size.
Solution Approach 2:
The sealing member serves multiple purposes: it acts as both a sealing element to prevent oil leakage and as a biasing element (replacing the spring) to maintain contact between the side plate and cam ring. This multi-functionality reduces the number of components and overall pump size.
2Reliability
If a spring is provided between the body and the side plate to bias the side plate towards the cam ring, then leakage prevention is improved, but assembly complexity increases
Solution Approach 1:
The sealing member integrates multiple functions: it seals the gap between the side plate and cam ring, and simultaneously provides the biasing force through its elastic deformation. This combines the sealing function and spring function into a single component, eliminating the need for a separate spring and reducing pump size.
Solution Approach 2:
The sealing member serves multiple purposes: it acts as both a sealing element to prevent oil leakage and as a biasing element (replacing the spring) to maintain contact between the side plate and cam ring. This multi-functionality reduces the number of components and overall pump size.
3Reliability
If the sealing member is compressed between the side plate and body, then sealing performance is improved, but the risk of dislocation increases
Solution Approach 1:
The groove is pre-formed in the side plate with dimensions and positioning features that guide the sealing member into its correct position during assembly. This preliminary structural preparation ensures the sealing member remains properly positioned during compression and operation, preventing dislocation while maintaining sealing effectiveness.
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 O-ring effectively seals the gap between the side plate and the body, preventing oil leakage and improving discharge performance, while reducing the overall length and part count, thus enhancing the pump's efficiency and assemblability.
Implementation Method 1
a sealing member provided in an outer circumference of the side member, the sealing member being configured to seal a gap between the outer circumference of the side member and an inner circumference of the body
Data Source
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AI summary
A cartridge vane pump includes: a side plate 20 brought into contact with first end surfaces of the rotor 2 and the cam ring 4; a cover 10 brought into contact with second end surfaces of the rotor 2 and the cam ring 4, the cover 10 being configured to be attached to the body 101; and an O-ring 30 provided in an outer circumference of the side plate 20, the O-ring 30 being configured to seal a gap between the outer circumference of the side plate 20 and an inner circumference of the body 101. The side plate 20 has: a first flange portion 21 configured to restrict movement of the O-ring 30 towards the rotor side; a second flange portion 22 configured to restrict movement of the O-ring 30 towards an opposite side from the rotor 2; and an accommodating space 23 defined by the first flange portion 21 and the second flange portion 22, the O-ring 30 being configured to be accommodated in the accommodating space 23. The first flange portion 21 is formed to be able to compress the O-ring 30 with the body 101 in an axial direction of the driving shaft 1.