Cartridge Vane Pump Side Plate Sealing Without Bias Springs
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Solution Overview
Problem
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
The use of an O-ring as a sealing member that compresses between the side plate and the body, acting both as a seal and a biasing mechanism to prevent oil leakage, eliminating the need for additional biasing members like springs, thereby reducing the pump's 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 is integrated with the side plate to form a unified component. The side plate and sealing member work together as a single assembly unit, eliminating the need for separate springs while maintaining the biasing function needed to prevent leakage between the cam ring and side plate
Solution Approach 2:
The sealing member serves multiple functions simultaneously: it provides sealing to prevent oil leakage, acts as a biasing mechanism through its elastic deformation, and maintains contact between the side plate and cam ring. This multi-functionality replaces the need for separate spring components
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 is integrated with the side plate to form a unified component. The side plate and sealing member work together as a single assembly unit, eliminating the need for separate springs while maintaining the biasing function needed to prevent leakage between the cam ring and side plate
Solution Approach 2:
The spring component is extracted from the assembly by replacing it with an elastic sealing member that provides the necessary biasing force through its material properties rather than through a separate mechanical spring element
3Reliability
If the first restricting portion has a larger outer diameter than the second restricting portion, then the sealing member can be compressed axially to improve sealing, but the structural complexity of the side member increases
Solution Approach 1:
The first and second restricting portions are designed with asymmetric outer diameters, where the first restricting portion has a larger diameter than the second. This asymmetric design enables differential compression of the sealing member in the axial direction, allowing the sealing side to experience greater compression for improved sealing while maintaining structural integrity
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 effectively prevents oil leakage, enhances discharge performance, and improves sealing reliability while reducing the overall length and part count, thus enhancing assemblability and cost-effectiveness.
Implementation Method 1
the first restricting portion is formed to have an outer diameter larger than an outer diameter of the second restricting portion so as to be able to compress the sealing member with the body in an axial direction of the driving shaft
Implementation Method 2
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
AI summary
A cartridge vane pump includes: a side plate brought into contact with first end surfaces of the rotor and the cam ring; a cover brought into contact with second end surfaces of the rotor and the cam ring, the cover attached to the body; and an O-ring provided in an outer circumference of the side plate, the O-ring being configured to seal a gap between the outer circumference of the side plate and an inner circumference of the body. The side plate has: a first flange portion configured to restrict movement of the O-ring towards the rotor side; a second flange portion configured to restrict movement of the O-ring towards an opposite side from the rotor. The first flange portion is formed to be able to compress the O-ring with the body in an axial direction of the driving shaft.