Rotary Pump Axial Pressure Balancing
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Solution Overview
Problem
Existing rotary pump devices for vehicle brake control systems face challenges in generating consistent fluid pressure due to variations in hydraulic system pressures, leading to potential deformation of pump casings and reduced efficiency, especially when high pressures are not evenly distributed across the pump body's surface area.
Innovation Solution
The design introduces first and second outlet ports on the axial surfaces of the pump casing, allowing discharge pressures from both rotary pumps to be applied to larger surface areas, eliminating the need for a spring or reducing its force requirement, thereby maintaining balanced pressure and preventing deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a spring member is used to push the pump body in the axial direction, then the pump body movement is restricted and casing damage is prevented, but the pump body and housing require high rigidity and complex assembly processes to resist the spring force
Solution Approach 1:
The invention extracts the spring member from the system and replaces it with a fluid pressure-based pushing mechanism. The pump body is pushed in the axial direction by fluid pressure applied to the bottom surface of the pump body, eliminating the need for mechanical springs and their associated assembly complexities while maintaining the function of preventing casing damage
Solution Approach 2:
The invention uses fluid pressure (hydraulic principle) to generate the pushing force on the pump body. Fluid pressure is applied to the bottom surface of the pump body to push it in the axial direction, replacing the mechanical spring system with a hydraulic actuation mechanism that simplifies assembly and maintains reliability
2Force
If high pressure is applied only to the second back pressure chamber with small surface area, then the pushing force on the pump body is insufficient, but applying pressure to a larger area requires a more complex pressure distribution system
Solution Approach 1:
The invention segments the pressure application areas into two distinct zones: a first back pressure chamber with a first surface area and a second back pressure chamber with a second surface area. Each chamber receives fluid pressure independently, and the sum of their pushing forces provides sufficient total force on the pump body without requiring a single complex high-pressure system
Solution Approach 2:
The invention applies fluid pressure to both the first and second back pressure chambers, creating a combined pushing force that exceeds what would be achieved by pressurizing a single small area. This partial application of pressure to multiple areas results in excessive total force that reliably prevents casing damage
3Force
If the pump body is pushed by spring force and fluid pressure, then the pushing force varies with hydraulic system pressure, but this causes deformation of the pump casing when pressures are unbalanced
Solution Approach 1:
The invention uses the first back pressure chamber as a counterbalancing mechanism. When fluid pressure increases in one hydraulic system, the corresponding increase in pushing force on the pump body is counterbalanced by the pressure in the first back pressure chamber acting on the opposite side, preventing net force that would cause casing deformation
Solution Approach 2:
The invention creates a pressure equilibrium system where both the first and second back pressure chambers are subjected to fluid pressure. This equipotential pressure distribution ensures that the pump body experiences balanced forces from both sides, maintaining stable composition and preventing casing deformation even when hydraulic system pressures vary
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 solution ensures proper fluid pressure generation for the pump body, maintaining its position and efficiency even without a spring or with minimal spring force, while reducing the risk of deformation and improving durability by distributing pressure evenly across the pump casing.
Implementation Method 1
a first outlet port is opened to a first axial space which is formed between a bottom surface of a cylindrical recessed portion of a housing and an axial forward end surface of a first pump casing of a pump body, so that discharge pressure of a first rotary pump is introduced into the first axial space
Implementation Method 2
a force is generated by a spring member in an axial direction in order not only to restrict a movement of a pump body (in which rotary pumps for two hydraulic systems are accommodated) in the axial direction
Data Source
AI summary
A first and a second rotary pumps are provided in a first pump casing of a pump body, which is inserted into a cylindrical recessed portion of a housing 101. A first outlet port is opened at a first space formed between a bottom surface of the cylindrical recessed portion and an axial forward end surface of the first pump casing, so that discharge pressure of working fluid of the first pump is supplied to the first space. A second outlet port is opened at a second space formed between an axial backward end surface of the first pump casing and an axial forward end surface of a second pump casing, so that discharge pressure of working fluid of the second pump is supplied to the second space.